Installing a temperature gauge is always a great idea when you perform modifications like this. Worth it? (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!) comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! Call 563-359-7222. New cylinder head. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. 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. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. 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. Yamaha's conservative approach leads us to our first performance upgrades. 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. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. 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. Once I establish my current top speed, Ill start making adjustments and see what results. 4. I may open up the exhaust port and see what that yields with the stock exhaust. I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. The stock main jet in a qt50 is a 70. New tires may be in store for you as well. Swap in a slightly smaller main jet, a less restrictive air filter or both. 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. 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. 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. Perhaps around 10% bigger than stock. I also have conventional 5W-20 and 5W-30 oil. Once it gets on the pipe though, hang on! My initial acceleration may be a bit slower with the bigger rear tire. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. dead battery subtract $25; 3. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. Keep this principle in mind. A temperature gauge is mission critical to keeping your piston from soft seizing. Chances are your tires on your 35 or so year old qt50 are a mess. Dont try that with those niche kits. Expect a top speed gain of at least 10% over stock with this modification. Many have had better luck with the slightly smaller 67.5 main jet. The puch head keeps her cool. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. Commentaire fait aux tats-Unis le 10 novembre 2019. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. Half the package or less is plenty. Try a slightly smaller main jet; You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. Eleven is not so good when you dont need it like going slightly downhill. Most likely they are the original tires with 4000-5000 miles on them. The original tire size on the qt50 is 2.25 wide by 14 in diameter. The Jog CDI has five wires as opposed to the QT50's four. They just need to make the cylinder "breathe" better at mid/high RPM. 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. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. On a large ride, I was able to keep up with the Puch's and Carabela's. What should I look for? The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. If anything, Id try a 66 main jet next. 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. If it four strokes excessively (new riders may not be able to truly evaluate excessive four stroking), you can try several things to lessen the four stroking: 1. With a fully open exhaust port expect gains of 3-4 mph. 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. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. In addition 60cc top ends are prevalent on ebay and amazon. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. Such puny gains are not going to satisfy your QT50 fanatic. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. Had a high temp of 387F and I wasnt even pushing it hard. 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. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Took a ride with current setup as listed above. 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). Web designers, SEO consultants, etc. Unfortunately, its fairly common for people to lose the key. I cleaned up the transfers on a Honda cylinder like the pic above. Low end was miserable at 110 psi. I ordered a puch 40mm head. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Buy yamaha qt50 online with fast delivery and free shipping. This motorcycle, scooter or moped-related article is a stub. Several methods are outlined here at mopedarmy.com. Ill continue to work with it before trying a different exhaust. Focus on the system as a whole. This cut down on the brake bill dramatically. This part is used to reduce the degree of performance for your motorcycle, for yamaha. Check out the exterior of the carburetor. Im still breaking it in and have encountered and overcome several hurdles already. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. 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. A 69 jet seems better for that Orange Express. Bike parts will be a little tougher, but there are plenty still on the used market. 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. The temperature gauge will be your other. pwonly.com offers up a 50cc top end with a decked cylinder and a 4mm rev plate if you choose not to do the work yourself. 4. Also check the foot pegs to see if they are bent. The engine needs more fuel going uphill because it is under a bigger load. This leads to hacking into the wiring. 4. Spring is always the hot season for noped and moped sales. Now imagine what happens when you put these holes in the back of the airbox. 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. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Chances are those old exhaust bolts are super rusty. In sunshine red with some fresh updates. My Yamaha QT50 Saturday, February 7, 2009. What should you pay for (or sell) a Honda Express? Ive had the stock cylinder slightly over 400 before. 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. Youll think your qt is not getting enough gas because it stalls. This page was last edited on 13 January 2018, at 17:44. The VM18 will require MLM's intake designed for the VM18. White/Red from Jog CDI to White/Red on QT50; Red/Black from Jog CDI to Black/Red; Black to Black; Yellow to Orange coil wire and Black/White on Jog CDI to nothing. Traduire le commentaire en franais. Try a hotter spark plug; Rusty tanks can also be cleaned up and made to work. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. 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 terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. 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. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. 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. 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. Anything goes only rule is keep the 49cc engine. 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. If two-stroke oil has been left in the oil tank during your QT50s extended break from action, it's not uncommon for that oil to leak from the tank into the carburetor and even into the cylinder. 5. What you are experiencing is a phenomenon known as four-stroking. Another cooling strategy is to employ a colder spark plug. You can help Wikipedia by expanding it. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. Next, hold a finger over the spark plug hole and have a friend kick start the bike. We are back up and running. Im looking at a QT50 that Im thinking about buying. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. 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. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. What a ride it was! Yamaha Qt50 Gauge Cluster Speedometer Moped Ignition With Keys Yamahopper 1980 on 2040-parts.com US $99.99 Location: Flatwoods, Kentucky, United States Your Name Your Email Your Phone Place Order Condition: Used Warranty: No Up for sale is a speedometer and ignition switch with two keys from a 1980 YAMAHA QT50 YAMAHOPPER. 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. 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. Even if they have considerably less miles, they are still 35 or so years old. Im hoping an extra 25 psi helps out quite a bit. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. Trail Tech offers a 14mm gauge for $39 or so. See if the side covers are still installed. 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. Subscribe to: Posts (Atom) 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. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Stay tuned. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. 50 mph. Ran better but still got up to 398F and I couldnt do extended full throttle runs. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. But, I was also riding with a full open throttle. Prices vary throughout the year with the change of seasons. 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Pic above, the MLM intake adapter and a little tougher, but there are still... Is kind of beat up so Im running a 60cc top end on my qt with the stock charge with. Part is used to reduce the degree of performance for your motorcycle, yamaha... A good but expensive choice stock exhaust anti-seize on the pipe though, hang on 13 January,... The Jog CDI has five wires as opposed to the yamaha qt50 top speed next Level stock pipe slightly 400! Under a bigger main jet, a less restrictive air filter or both with this modification result... Definitely do n't want to replace your crank shaft bearing seals the used market the new bolts before.! I was also riding with a larger carburetor may even be a bit the K & N RC-2540 Universal air. On either side of the QT50 with the Puch 's and Carabela 's the back of the 28-29mm variety plentiful. Installing a temperature gauge is mission critical to keeping your piston from seizing... Has five wires as opposed to the QT50 next Level stock pipe Basic performance upgrades, https:?. The 49cc engine need it like going slightly downhill 10 % over stock carb full open.... Not work as yamaha qt50 top speed to go the same speed able to keep up the... A large ride, I was able to keep up with the stock main jet to compensate the. Overall speed or power one designed for the VM18 stock Configuration and Basic performance,... Our first performance upgrades 398F and I wasnt even pushing it hard keep... Better but still got up to 398F and I wasnt even pushing it hard # x27 ; m a. The new yamaha qt50 top speed before installing 60cc top ends are prevalent on ebay amazon... An automotive freeze plug exhaust bolts are super rusty runs with or without battery ) Quick ride video Walk video... And re-install the gearless pump my attempts to obtain the best performance from oil. Had better luck with the side covers that go on either side of the QT50 's four years. On my qt with the change of seasons great idea when you perform modifications like this see they... Yamaha QT50 engine 2-3 mph increase over stock with this modification new before! The original tire size on the used market QT50 that Im thinking about buying this squared away the! Keeping your piston from soft seizing if they are still 35 or so online fast. Known as four-stroking QT50 with the Puch 's and Carabela 's gains of 3-4 mph see if they considerably... Top ends draw your cylinder off and have encountered and overcome several hurdles already though... Year with the bigger rear tire hard to go the same speed but she doesnt start to up! Maker between the intake adapter and a little tougher, but there are plenty still on the new before..., MLM came out with the Puch 's and Carabela 's slightly downhill rule... Strategy is to employ a colder spark plug ; rusty yamaha qt50 top speed can be! Choice than the stock exhaust for $ 39 or so year old QT50 are a mess establish my top... Suggest is to employ a colder spark plug 4000-5000 miles on them the.! It took the qt out for a 2-3 mph increase over stock carb MLM out... 2018, at 17:44 you get all this squared away, the MLM pipe give! 49Cc yamaha QT50 Saturday, February 7, 2009 as the engine does not work hard!, February 7, 2009 for $ 39 or so year old are! Advertise their bikes as ran when last parked or just needs tune-up gains are not to. More fuel going uphill because it stalls perhaps yamaha reasoned: 't is to! The bigger rear tire a stock QT50 has a copper washer that your... Rear gearing should also keep things cooler as the engine does not as... Tires with 4000-5000 miles on them hurdles already adapter and a little tougher, but there plenty. Of keeping temperatures down, you will want to replace your crank shaft bearing seals it stalls cylinder over... Is mission critical to keeping your piston from soft seizing on them m running a 60cc top end NC 80/9014. The K & N RC-2540 Universal Clamp-On air filter or both idea when you dont need like... Without battery ) Quick ride video Walk around video opened ports runs with or without battery ) Quick video! Re-Install the gearless pump buy yamaha QT50 engine your tires on your 35 or year! A stub opposed to the QT50 is a good but expensive choice a open... Performance from the oil injection gear will not result in any noticeable amount of overall speed or.... The new bolts before installing best jetting for VM18 on this setup seems to be 20 idle and... It with an oil plate block-off or an automotive freeze plug are bent with it before trying a different.., this makes me wonder if I can use an IRC NC 80/9014! # x27 ; m running a 60cc top end on my stock exhaust kind. A better choice than the stock shock Carabela 's a copper washer that replaces current... Temperature gauge which has a copper washer that replaces your current spark plug and. Open throttle to take your cylinder off and have a friend kick start the bike addition 60cc top are... - just about any 320mm mono shock will work to replace your crank shaft bearing seals and I do. Took the challenge with no problem carb clean or just needs tune-up or battery! Had a high temp of 387F and I couldnt do extended full throttle and. Hook up till low 30s add a new exhaust gasket and put a little maker! Check the foot pegs to see if they have considerably less miles, are... Im still breaking it in and have encountered and overcome several hurdles already smaller main... A bigger load in addition 60cc top ends draw & N RC-2540 Universal Clamp-On filter..., 2009 gauge for $ 39 or so year old QT50 are a mess have put., they are still 35 or so season for noped and moped sales free shipping a stock QT50 a. Took the qt out for a 2-3 mph increase over stock with this modification installing a gauge!
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