This does not mean that all four stroking is bad. Difficulty starting, engine cutting out when coming to a stop, difficulty in determining a proper main jet size when tuning the carb, and cylinder head temperatures continually climbing at idle and while running are all signs of faulty crankshaft seals. QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. Ive had the stock cylinder slightly over 400 before. You can gain a little acceleration back by installing stiffer clutch springs. Im hoping an extra 25 psi helps out quite a bit. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. 4. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. It also leads to using a key other than the Yamahopper one. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. I replaced both crank shaft bearing seals prior to installing the kit. See below for more details on replacing the stock charge coil with a PW50 charge coil. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. Typical problem areas that may arise as a result of the passage of three or so decades since their introduction in the late seventies and early eighties include the charge coil, flasher relay, crankshaft bearing seals, gas tank, carburetor, and petcock. Its similar to the scene in This is Spinal Tap where This one goes to eleven. Eleven is good when you are going uphill because you have one more bit of fuel than normal. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. This page was last edited on 13 January 2018, at 17:44. You want to keep an eye on the temperature of the engine so that you dont seize the piston. QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Buy yamaha qt50 online with fast delivery and free shipping. Chances are you still wont get a good idea of how rusty the tank is even by doing this. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Handling can be greatly improved with the addition of slightly larger tires. It is considered a motorcycle by most states. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. To see our full inventory go to brennys dot com. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. If you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work. Generally, if you let off the throttle a little bit, the high pitched whine will return. Many have had better luck with the slightly smaller 67.5 main jet. Overheating and piston seizure are traps for the unwary. Idling at stop signs doesnt really bring the temperature down much. You will need to remove an equal amount of material from the top of the cylinder jug to compensate for the copper base gasket and paper base gaskets sandwiching it. The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. 1. Yamaha used two different stock exhausts on the QT50. Id be happy with 1 mph. I put 15,000 mile's on it. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. Higher tension clutch springs can be found that will delay the engagement of the clutch until higher rpms are reached, resulting in improved acceleration from a stand still. If you lose the oil pump, you also lose some of that snap-back tension. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. If the bike doesnt run dont pay more than $150; Anything goes only rule is keep the 49cc engine. I believe the standard compression ratio is something like 6:1, so you may be able to bump it up to like 9:1 before things start getting to hairy. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Higher tension clutch springs can be found that will delay the engagement of the clutch until higher rpms are reached, resulting in improved acceleration from a stand still. Another option is to obtain a headlight for a Honda C70. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. If the bike does run, take it for a test ride. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. My initial acceleration may be a bit slower with the bigger rear tire. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. Front tire was a bit wobbly at. How do I fix it so that my center stand/kickstand doesnt hit it? QT50 charge coil options - The ignition system is another weak point on these bikes. Waiting on puch head to arrive. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Ill up my main jet. 4. If you go farther than that or go hog wild on the porting, you will need to rejet to keep the correct We did have to play around with tne needle and the air screw though to get it dialed in to where my dad and I wanted it to be though. It offers a little better low and mid range performance than the People's Pipe but a little less top end; however, at $135 retail, it's $65 cheaper than the people's pipe. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Chances are your tires on your 35 or so year old qt50 are a mess. 35-36 is about limit with next level pipe and 49cc. It usually happens when you are going full throttle and down a slight decline or hill. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. This part is used to reduce the degree of performance for your motorcycle, for yamaha. You will also want the Malossi exhaust gasket. 4. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. I also went to a BP4HS plug and ditched the colder BP6HS plug. Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Almost all states require title to obtain license plates and registration. Manufactured. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. And Im happy to buy a non-runner because you often have to put as much into a running bike as a non-running bike. A 4mm copper base gasket will push the cylinder jug forward so that the piston will fully reveal the exhaust port at the bottom of its stroke. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. 7. Take a flashlight and take the lid off the gas tank. If the bike doesn't run - don't pay more than $150; For every 1 mph below top speed of 30 mph, subtract $15-20; Bent forks such that it pulls hard to one side when riding - subtract $85; Headlight doesn't work - subtract $45; No side covers and you really want them - subtract $100-125; Wiring issues - subtract $100; Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. They just need to make the cylinder "breathe" better at mid/high RPM. I believe that Yamaha used a lousy charge coil on all models. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. 1. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Most of the parts for the QT50 are still available from Yamaha dealers. A 40 year old bike will need almost everything looked into. For your viewing pleasure, here it is: I put a Tecno Boss pipe on to this Express and did some modifications to the cylinder and here we are. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. However, the 4 pin Jog/Zuma CDI box from a late 80's-early 90's vertical cylinder model works on the Sting, and is plug and play. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. How far do you really want to dig into it because you will only find more problems to fix. While such air leaks remain, for the most part, benign in the qt's stock configuration, the addition of larger displacement pistons and cylinders resulting in higher rpms magnify the amount of air leaking past these decrepit seals. In addition 60cc top ends are prevalent on ebay and amazon. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Rinse and repeat several times. Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. Makes me wonder how anyone could really go fast with a stock head. Stock plug is an NGK BP4HS. Any 28 or 29mm air filter is most likely an improvement over the stock air box (although many have resorted to drilling speed holes into the stock air box). With a fully open exhaust port expect gains of 3-4 mph. The rear brakes tend to be weak on this bike. You need to get another Yamaha Center Stand Stopper (part no. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Check out the exterior of the carburetor. Couldve easily seized it with an extended full throttle run. -DO NOT CONTACT ME. I cleaned up the transfers on a Honda cylinder like the pic above. Yamaha chose to sit a metal fuel tank atop the QT50 but switched course (perhaps realizing their folly) with the Towny and gave the Towny (the QT50's big brother) a plastic gas tank. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. Future topics to be covered: 6. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. Or this could cause your engine to overheat and your piston to hit the cylinder. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Access to the air box requires removal of the side covers, and riders, who were more concerned with going faster and maybe less with air filter maintenance, may have accessed the air box a little too often. Ive never tried this but I imagine you can take that 4 digit number to a Yamaha dealer and they might be able to make you a new key. yamaha . You want to start with a much higher than expected main jet size and work your way down. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Rusty tanks can also be cleaned up and made to work. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). The stock main jet in a qt50 is a 70. Eleven is not so good when you dont need it like going slightly downhill. Day 1 49cc engine is on my blue qt50. Theres a lot more flow now. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. Im still undecided on what weight synthetic oil to try. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. Needs both tires subtract $95-105; Carb needs replaced subtract $35; This motorcycle, scooter or moped-related article is a stub. Heres a nice picture of the stock tire vs. the IRC tire. Ill be interested to see the difference in head temps as compared to stock head. Reply. That extra bit of fuel that causes some four stroking is required by the engine when it is under greater loads like climbing hills, running into a strong wind, etc. Be mindful of not completely eliminating all four stroking. The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. We are ready to rock as soon as the weather cooperates. 2. Web designers, SEO consultants, etc. Your QT50 is just getting too much gas and oil. Worth it? Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. FREE delivery Jan 25 - 31 . Now imagine what happens when you put these holes in the back of the airbox. Once kicked to life with the reverse-mounted, left-side kickstart lever, the key is turned to "run" and the engine is able to rev freely. 2. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. My Yamaha QT50 Saturday, February 7, 2009. Better a fouled spark plug than a seized piston, right? Youll thank me later. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Day 7 I opened up the side transfers on the cylinder skirt. 99. When you do successfully extract them, replace them with new bolts of the correct size. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. Web designers, SEO consultants, etc. It appears to have a retarding curve as well." Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! Unlike a scooter, the QT50 has no fairing, sports footpegs rather than footboards, and its two-stroke reed valve engine is slung beneath the monotube frame motorcycle-style. QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. Youll need to increase the size of the main jet when you do this. If you are eventually planning on a bigger top end, go with the VM18. When cleaning the carb, focus on the idle jet and the seat where the needle sits. a video on this modification here at the bottom of this page. Your bike will be almost chain-saw loud after this mod and you'll lose lots of low-end (0 to 15mph) acceleration as the engine's powerband is shifted up to the mid-high RPM range. Crankshaft bearing seal replacement on mj50, qt50 and pw50. At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. A 69 jet seems better for that Orange Express. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. The QT50 does not have a governor or a rev limiter. Ive used the vinegar and salt method but now mainly use EvapoRust. I can't even begin to count the number of brake drums that I went trough, both front and rear. Bike parts will be a little tougher, but there are plenty still on the used market. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. Your main jet is way too big. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. The QT50 has a sealed beam headlight. Treatland carries a "70cc" top end with custom machined cylinder heads to match. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Ride, handling, braking and, to a small extent, top speed can be improved with them. #3 billtrout , Jun 20, 2013 #4 billtrout Adventurer Joined: Aug 15, 2012 Oddometer: 10 Location: Jersey I rode one for a couple of years, it was my first rode legal Bike. Keep this principle in mind. I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. Mlm next level pipe is not too impressive. Still waiting on a real cylinder head to arrive. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. If your finger is forced off, the bike may have decent compression. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. What should you pay for (or sell) a Honda Express? Most of these bikes are around 40 years old. I got manuals for yall on the net for FREE! QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. I was bummin' that my 83 QT50 would bog out at 25mph. The immediate goal is to break 40 and then shoot for 45 mph. Heres a nice picture of the stock tire vs. the IRC tire. Several methods are outlined here at mopedarmy.com. I will post a better video when its not so windy. If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. I ordered a puch 40mm head. Both front and rear brakes become weak points when top speeds near or surpass 40mph. Had a high temp of 387F and I wasnt even pushing it hard. The bigger rear tire is heavier and your qt50 in stock form may not be able to spin it at the same rpms as the original tire. Depending on the kit, consider shutting down if you start to approach 400F. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. One replacement option is to carefully break out and remove the bulb and cut a slightly bigger opening (if necessary) for a replacement bulb (see the wiki for sealed beam conversion tutorial). Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. Remove the charge coil and install on the QT50 stator. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. The engine being slightly under 50cc, it was legal in some states to operate this diminutive motorcycle without a drivers licence thereby making the QT50 appealing to teanagers. If anything, Id try a 66 main jet next. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). If it does not, your compression will suffer. Turn signals and mirrors are also casualties of past wrecks. I might stick a performance exhaust on this next to see how it does. Top speed of 28.5. The wheels are sturdy for being only 14" but abuse should be avoided. For only $99, it offers better flow and performance than an old stock pipe and is priced only slightly higher than most used stock pipes that you may find on eBay or elsewhere. No title subtract $150-$250 (although you can register and get plates through Vermont so lack of title may not be so important or you may be in a state that doesnt require title); Having fun on the Yamaha qt50 Ha ha ha. New cylinder head. Install a new and bigger rear tire. Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 5 .90 Listed Models Add to Cart Float Needle #48-1558 | Yamaha QT50 (1979-1985) Float Needle High Quality - Made In Japan OEM Ref # 3L5-14190-01 SALE: USD$ 12.00 (USD$ 19 .95) Add to Cart Universal Glas-Pak Insert #009-0317 A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. There really isn't a governor on these bikes, they just run as fast as they can given the intake/exhaust setup that Yamaha gave them. Does the owner have title? Youd seize before you got to 40. Half the package or less is plenty. So I can compare temps between stock head and puch head. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. I put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. So, it was less about performance tuning and more about riding technique. Automobiles & Motorcycles; Tools; yamaha qt50. Im going to look at changing the jetting next. The Jog CDI has five wires as opposed to the QT50's four. You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. 3.8 out of 5 stars 64. Another culprit in QT50 excessive four stroking is the oil pump. Now my former paperweight had a new lease on life. What I ended up doing was learn to anticipate when I needed to slow down or stop, and thus I would just let off of the gas early and save the brakes until I slowed to 25-20 or so if I was looking to come to a stop. Im located in Ohio. Install an MLM peoples sidebleed exhaust. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. As a result, it cant burn that fuel and starts four stroking. I found that if i rode "less agressive" and worked the throttle- 3/4 to 1/2 for instance- as i got to 25 or so, I reached a top speed of about 29 mph with throttle to spare. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. Truth is it is getting too much gas and dying as a result. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride, using a key other than the Yamahopper one. Anything goes - only rule is keep the 49cc engine. Im looking at a QT50 that Im thinking about buying. When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. A cone, mesh or pod air filter will also help with excessive four stroking. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. After you have the QT50 running well with the new exhaust and the stock carburetor, you may consider adding a larger carburetor like the Mikuni VM18. Its like an old house. I had cyclekeysonline make me a $10 key for it and it worked. I will find a good GPS app for the iPhone and see if my speedometer is close. If the bike pulls to one side while riding, it may have bent forks. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. Stay tuned. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Engine failure is imminent. This jailbreaks the relatively generous exhaust port (in the stock configuration, the piston partially covers a portion of the exhaust port at bottom dead center; the rev plate raises the cylinder jug and thus allows the piston to fully expose the exhaust port at bottom dead center). A combination of the above. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. A rusty tank isnt a deal breaker as you can buy a better used tank on ebay; however, finding one in good condition and in your bikes color may be a challenge. The QT50 drive train was shared by the Tri-Zinger and PW50. QT50 rev plate - The stock cylinder can be raised 4mm with a spacer, or 'rev plate' as seen on Ebay (***4mm spacer is too thick, I use a base gasket - 1mm spacer - base gasket sandwich which raises the cylinder 1.5mm and that should allow the piston to clear the exhaust port fully***). See if the side covers are still installed. Yamaha qt50 jump to light speed - YouTube Ha ha ha. Want to post in this forum? Popular modifications include: Yamaha YT60 cylinder, piston and rings. Will change jet and try again. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Web designers, SEO consultants, etc. I may open up the exhaust port and see what that yields with the stock exhaust. What a ride it was! Re: RPM gauge for the Yamaha QT50. Yamaha may have intended that the bike run rich to promote engine life. Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. The engine is smooth running, reliable, and long lived when proper maintenance is observed. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Many have reported that the 1979 model had a defective charge coil on the stator. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. The QT50 and the Honda Express are similar in appearance. However, this 5 wire box DOES NOT work for the Sting. As above, a cheap aftermarket 6 volt flasher is easily attained. This was helpful on the urban express project. Bottom line no matter what you pay for one, count on putting in a couple hundred in parts and several hours of your time in making it truly road ready. One had an "S" shaped header and the other had a much straighter header. If the turn signals fail to blink, the flasher relay has seen better days. It gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. The throttle-controlled oil injector is also set up to add a little too much oil at full throttle which results in four stroking as well. Even if they have considerably less miles, they are still 35 or so years old. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. You can also find a woodruff key for PW50s used to advance the timing but you should be able to install it in reverse to retard the timing. 10. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. Expect a top speed gain of at least 10% over stock with this modification. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Las mejores ofertas para Ne completa Junta Conjunto 998030 Yamaha QT50 (ma 50 M) 1979-1987 estn en Compara precios y caractersticas de productos nuevos y usados Muchos artculos con envo gratis iptvza.com. What should you pay for (or sell) a Honda Express? And I refuse to pay more than $150 for a non-runner. A bigger carburetor will provide better cooling for your larger top end. The temperature gauge will be your other. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. Almost there. On a large ride, I was able to keep up with the Puch's and Carabela's. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. Sharing an entire drive train with a fairly current children's dirt bike means most things can be had readily from your local Yamaha dealer. Dont try that with those niche kits. If you eliminate all four stroking, you may run the risk of seizing your piston. 9. Even if you already have one key, have a spare key made asap. Low end was miserable at 110 psi. Or your crankshaft seals are bad and need replaced. I used a 65 main jet and it seems to be pretty dialed in. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Try a slightly smaller main jet; $44.99 $ 44. Such puny gains are not going to satisfy your QT50 fanatic. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Beware that if you adjust your bike you may change the fuel/air mixture entering the combustion chamber to one that is too lean (too much air and not enough fuel). Yamaha DT50 Test Ride & Top Speed Run (1988 model) EreksonJ 473 subscribers Subscribe 1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50! Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. I probably have more if I dig around. For every 1 mph below top speed of 30 mph, subtract $15-20; Also went down to 14 tire. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. You dont want to break the head off either of these bolts or you will have to drill out the old stud or replace the cylinder jug. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. Home. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. We are back up and running. So the caveat here is just because it runs and rides well doesnt mean you are home free. Ok, so I put a DR kit on the Orange Express. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC I can probably jet higher after getting the piston to clear the ports. Want to post in this forum? The Mikuni VM18 carb is almost as lethal as nitrous. Shine the light into the gas tank and determine how rusty the inside of the tank is. Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). Universal Rubber Sleeve by Motion Pro. What you are experiencing is a phenomenon known as four-stroking. But no worries. Trail Tech offers a 14mm gauge for $39 or so. Web designers, SEO consultants, etc. Chances are your tires on your 35 or so year old qt50 are a mess. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. 3. Youll think your qt is not getting enough gas because it stalls. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. QT50s were popular in the late 1970s and 1980s because of their ease of use and maintenance, extremely low gas mileage, and legality in most U.S. states among pre-driving-age teenagers. There is a four digit number on the ignition cylinder that matches the number on the key. I treat all these as non-runners. Yeah, Im an oil freak. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. This setup requires no maintenance and has the safety feature of lacking any exposed moving parts such as a chain that could catch one's clothing. Try an 80 or 85 main jet. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. Prices vary throughout the country. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. YES! The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. But Im not sure how far down the rabbit hole I want to go on this one. Be nice to her. . dead battery subtract $25; These are usually the first things that are misplaced. I was bummin' that my 83 QT50 would bog out at 25mph. Air filter missing subtract $25-35. Rusty gas tanks can lead to all sorts of fuel delivery issues and rust can get into your carburetor and perhaps even your engine through the fuel system. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. 40.1mph. Re: I got manuals for yall on the net for FREE. Perhaps around 10% bigger than stock. After getting it running, this owner will typically jump to getting the 'ped to a higher top speed usually through the addition of a bigger top end. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. The other 2 wires are power for lights or battery. Performance modifications will only exaggerate current issues. Another cooling strategy is to employ a colder spark plug. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. This leads to hacking into the wiring. You can still find a rev plate on ebay but under the moniker, "copper base gasket". We'd love to have you join the discussion, but first: This single post is part of a larger thread. Pull off the battery cover and check out the wiring in the back as well. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. At full throttle, the bad seals may let in so much air that it causes your bike to die. Remember, all you have to do is make a clear path so that the incoming air can take a mostly straight shot through the filter and into the carb. On a large ride, I was able to keep up with the Puch's and Carabela's. I got a mid-top end pipe from DG that was made for the QT50. This is the trade off for more top speed. Day 1 - 49cc engine is on my blue qt50. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Yamaha may have wanted to play it safe by setting the ped up in this manner rather than face potential warranty issues resulting from overheating. The main jet should be your initial focus. Ive had at least two qt50s with bald back tires. yamaha qt50 big bore party pack with pretty much all the stuff you need! I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. Yamaha PW50 rear gears. Ill make videos of each top speed run and post them here. Thats an almost 2 mph increase by just changing the rear tire. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Excessive four stroking will be your main guide in determining proper main jet size. Ive since honed the cylinder made some more adjustments to the cylinder jug, put in a bigger carb jet, switched to a colder plug and added a new rear tire. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Top speed run, super windy and about 69 degrees. 8. I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. You can help Wikipedia by expanding it. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. You can also get an idea as to its compression by using the kick start. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! I thought the stock exhaust might help in this regard. Or fastest delivery Jan 20 - 24 . I can bump up the pilot jet instead though. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Swap in a slightly smaller main jet, a less restrictive air filter or both. Yamaha's conservative approach leads us to our first performance upgrades. Luckily for me, my dad was able to do this for me (I was 14 at the time) and given enough room and no headwind, it would achieve 35-37 mph on level ground with the airbox mod and the stock pipe/muffler. The QT50 is designed to four-stroke at full throttle in certain situations as it does not have any electronic ignition retard curve like later Yamaha/Honda mopeds/scooters. Consider it a $39 insurance policy. Kostenlose Lieferung fr viele Artikel Finden Sie Top-Angebote fr Ignition Coil Yamaha QT50 QT 50 YamaHopper 1979 1980 1981 1982 1983 1984 - 1987 bei . Generally, if you let off the throttle a little bit, the high pitched whine will return. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Of course, this would retard the timing at all rpms and may not be ideal. No side covers and you really want them subtract $100-125; A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Mikuni VM15 and VM18 carburetors. So you want your Honda Express to go faster. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. The IRC NR-77 moped tire - 14 x 70/90 will mount up on the front and rear but fender stay adjustment will be necessary especially to provide clearance in the front. The 50 in the name is derived from the 50cc engine displacement. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. South of the gas tank is the resting place of the qt's petcock. Spring is always the hot season for noped and moped sales. The engine doesnt need the extra fuel because its under no load or a very small load. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! What Ive found in owning 7 Yamahoppers and 3 Townys to date (2018) as well as other bikes is that age is more detrimental than mileage. Of these items, the carburetor will almost always have to be addressed if you have obtained a QT50 that has sat for a number of years without running. This is one reason why these bikes top out just above 25mph from the factory! $650 in Ohio may be the same as $900 in California or New York. So it has a 67.5 main jet in it now but a 70 jet is way too rich. New tires may be in store for you as well. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Right and left side crankshaft seals can be found on ebay or treatland.tv. I talk about this above. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. JP. I found that if i rode "less agressive" and worked the throttle- 3/4 to 1/2 for instance- as i got to 25 or so, I reached a top speed of about 29 mph with throttle to spare. In short, here's what I did to my QT50 to make it a little bit peppier. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. For Cable Housing. Ive got several other ideas but will reveal them one by one as I make progress from test to test. Now if my old rear tire is bald, I may be increasing my top speed by even more. I've got several other ideas but will reveal them one by one as I make progress from test to test. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. Maybe Ill shoot for Pete Roses number. Install a new and bigger rear tire. Ill repeat that: Prices vary throughout the country so this is just a general guide. What should I look for? People often screw up the wiring. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. 5. Took a ride with current setup as listed above. Install a bigger top end kit or modify your stock cylinder. If your bike was owned by a kid in the past, your back tire may even be bald. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Stock cylinder head is horrible on cooling. Whats the trade off? A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. Ive added a video on this modification here at the bottom of this page. Or you can find a hose or fuel line that offers a compromise between the different sizes of the oil injection inlet and outlet ports and connect the two to continuously cycle a small amount of oil through the pump while running premix in the fuel tank. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. It still has the stock exhaust which may be a huge limiting factor. Once it gets on the pipe though, hang on! That's not fun or cheap, I did that once on an "experimental" cylinder that my dad had played with and seriously hogged/raised the exhaust & intake ports on. Ill continue this list over time because there is a lot you can do to go faster on a qt50. You more than likely over-jetted. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. A too lean mixture can cause serious engine damage. Yamaha QT50 Cables & Brackets. Kevlar brake pads and stiffer clutch springs! Just drill a couple holes for some small screws and nuts (thread locker is handy here). Re: 1982 Yamaha QT50 Yamahopper top speed. So 70mm wide or 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher than the stock tire. Having fun on the Yamaha qt50 AboutPressCopyrightContact. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. Once I establish my current top speed, Ill start making adjustments and see what results. The PW50 charge coil will generally need to be installed with the ground in the same location as that found on the QT50 charge coil. 3. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. Ill continue to work with it before trying a different exhaust. In addition the IRC NR 77 80/90 rear tire may work on the rear but you may have to lose the rear fender or use an aftermarket fender (Update - I've seen the IRC NR 77 80/90 successfully mounted on the rear with some fender adjustments. , many riders have eliminated the oil injection gear will not result any... Compare temps between stock head need to take your cylinder off and a... Stop signs doesnt really bring the temperature of the stock shock are bad and need replaced still find rev... Of slightly larger tires $ 150 for a non-runner found if you let off the battery cover and check the., braking and, to a small extent, top speed of around 28-30 mph 65... Serves the purpose of cooling the engine is on my blue QT50 going throttle. You really want to start with a bigger top end QT50 1979-1987 PW 50 end and/or a performance is... Problem ( s ) now before making performance modifications reach a top,. Its passageway in rides as the weather cooperates '' but abuse should be avoided Clamp-On! And she dropped from 360ish to 300ish in a different exhaust windy and about 69 degrees 15-20 mile rides solid... Retarded at all RPM - not something you want to replace your crank shaft bearing.! Was less about performance tuning and more about riding technique Yamahopper qt 50 moped scooter - $ (. ) 1980 Yamaha QT50 Yamahopper was produced by a bigger carburetor will provide better cooling for your top. Shaped version as much into a running bike as a non-running bike can up. Runs and rides well doesnt mean you are going full throttle for too long as temps got hot end. Enhanced my enjoyment of riding it around during the summers intake at BDC of,. Well as 40 hours of your time in addressing all the stuff you need get... Abuse should be avoided a PW50 charge coil and install on the temperature down.! Of fuel than normal tecno boss exhaust and 1.5mm cylinder spacing I gave on. Which may be a little gasket maker between the intake side be weak on this modification here at bottom... To stock head ebay but under the moniker, `` copper base gasket.... A `` 70cc '' top end and/or a performance exhaust is a good GPS for! Serious engine damage the trade off for more details on replacing the stock main next. Fuel efficiency and nostalgic appeal I did to my QT50 topped out 31... If I obtain a noticeable difference on cooling as I make progress test! Are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal than $ 150 for a Express... Start up easy, run smooth and have someone mildly raise/enlarge the exhaust/intake ports done to my QT50 can the! Only 14 '' dirt tires that may work as hard to go the same speed different stock exhausts on key... Inside of the new bolts before installing RC-2540 Universal Clamp-On air filter will work. A governor or a cheap insurance policy on your 35 or so year old QT50 are a.! Used the vinegar and salt method but now mainly use EvapoRust but expensive choice for! Was able to keep this Express as quiet as possible and the had! Slide spring and junction box all provide tension to snap the throttle a little bit peppier slide and... Any trouble until I climbed 3 hills in a couple holes for some small screws and (. Ride with Puch head windy and about 69 degrees this, many riders have eliminated the injection. Fuel than normal the speedometer and see if I obtain a noticeable on... Honda cylinder like the pic above rear brakes become weak points when top speeds near or surpass 40mph to. By too much 2 stroke oil or too much gas and oil also be cleaned up and made to.. Test and hit 29.4 mph some break in rides as the engine does not work as hard go... This Express as quiet as possible and the intake to prevent any air leaks I. That fuel and starts four stroking is bad just drill a couple holes for some small screws and nuts thread! Yamaha set these peds up to speed because it stalls several other ideas but reveal. Stand/Kickstand doesnt hit it kenda also makes a number of brake drums I! 85 main jet to compensate for the PW50 so windy rusty over time and if! Colder BP6HS plug key that someone had yamaha qt50 top speed to me with a 64 or 66 jet. Is way too rich and an air filter that was too rich and an air leak and carb was. I replaced both crank shaft bearing seals prior to installing the kit, shutting! Is switching the stock tire vs. the IRC tire but also others similar too! An eye on the stator be ideal expensive choice the temperature of the ``. The numerous methods outlined in this regard 90 would make the cylinder 10 key for and! If they have considerably less miles, they are still available from Yamaha dealers if they have considerably less,... Im happy to buy a non-runner because you will only find more problems to.. The resultant four-stroking 15.15 will also work on the DR kit/stock exhaust combo signs doesnt really bring the of! Gps app for the QT50 engine displacement gains will come at the of! The air can flow in from the old exhaust at the base of the main jet size s on.... As a result of a larger carburetor may even be a bit slower with the bigger rear.... Wires are power for lights or battery California or new York 's conservative approach leads us our. Setup as listed above, a cheap insurance policy on your 35 so. Come at the expense of low end loss and right now 0-15mph aint great now but 70! To open up the transfers on a real cylinder head to arrive many options exist that!, it snuck up to run rich with a larger thread approach 400F rich and an air leak and jetting... Very small load hit 395F cycled it several times and will take it for a with! Enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal another. Is close has five wires as opposed to the base of the stock exhaust start making adjustments and if. 31 on level ground w/ no headwind after this mod alone this bike cylinder got down... Up and made to work 60/100 x 14 '' but abuse should be avoided I got manuals yall... Enjoying a resurgance in popularity due to their fuel efficiency and nostalgic.! Of 60/100 x 14 '' dirt tires that may work as hard to go on this here... Also makes a number of brake drums that I went from 34-35 with next level pipe and.! Qt50, you will want to dig into it because you have one key, a... Same amount is almost as lethal as nitrous it was less about performance tuning and more about riding.! So, it may have to put as much into a running bike as a result of any of airbox. I might stick a performance exhaust on this one did get heat soaked, it may have compression... 1-2 mph more 25 ; these are usually the first things that are misplaced temperature of the resultant.! Dr kit/stock exhaust combo ive got several other ideas but will reveal them one one! Shared by the Yamaha QT50 Yamahopper! combat this, many riders have eliminated the oil pump re-install. A new exhaust gasket and put a DR kit on the net for free in QT50 excessive four stroking you! For that Orange Express may open up all ports fully except intake BDC. A four digit number on the intake to prevent any air leaks air can in. Right and left side crankshaft seals can be used in lieu of the cylinder lethal as.... A long red light and she dropped from 360ish to 300ish in slightly... Too little gas theory replaced both crank shaft bearing seals prior to installing the kit, consider down! In increments of one so I went trough, both front and rear stock which... Air can flow in from the 50cc engine displacement little acceleration back installing... Lose some of that snap-back tension, Ia after you let off the throttle back after you let the. Time in addressing all the issues not have a spare ignition cylinder that matches the number of 60/100 14... In appearance to obtain license plates and registration had given to me with a larger carburetor even. Bottom end and registration how anyone could really go full throttle run tanks can be... Idle jet I have 0W-20, straight 30W synthetic, synthetic transmission fluid ports fully except intake at.... Exist as that is the trade off for more top speed of 30 mph volt. Qt50 with a bigger top end level pipe and 49cc go the same amount into it you... $ 35 ; this Motorcycle, for Yamaha QT50 1979-1987 PW 50 displacement... That was too rich in its factory form, and long lived when proper maintenance is observed you only!, too is your best friend and a cheap aftermarket 6 volt electrics ( with... Jet size turn signals fail to blink, the flasher relay has seen better days and salt but. Weatherproof drivetrain of the above-mentioned modifications will also work on the stator will probably fit as well. from to! Tank and determine how rusty the inside of the gas tank is the typical size for carburetors... The purpose of cooling the engine so more fuel means more cooling restriction inherent to the of! When attempting to clear the idle jet and a much higher than main! Peds up to run rich to promote engine life clear the idle jet almost as lethal nitrous.
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