Want to post in this forum? #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 Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. Make sure you clean your original stopper well before gluing the new one to it. 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. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. A bigger carburetor will provide better cooling for your larger top end. You may also choose to richen up your jet needle by moving the clip down one or more positions. I've got several other ideas but will reveal them one by one as I make progress from test to test. Ride, handling, braking and, to a small extent, top speed can be improved with them. Another culprit in QT50 excessive four stroking is the oil pump. 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. 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. The bike has a very compact frame with the center of gravity fairly close to the rear axle giving it a very light feel in turns though it may become somewhat unstable on bumpy roads forcing the rider to shift his or her weight somewhat forward. So, in essence, it would be getting too little fuel. Install a bigger top end kit or modify your stock cylinder. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Web designers, SEO consultants, etc. My Yamaha QT50 Saturday, February 7, 2009. 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). QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. 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. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. The stock main jet in a qt50 is a 70. I can't even begin to count the number of brake drums that I went trough, both front and rear. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. 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. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Overheating and piston seizure are traps for the unwary. New bolts with some anti-seize compound are recommended. You will need to replace your main jet with a bigger main jet. Im located in Ohio. New and used parts are often found on eBay as well. A cone, mesh or pod air filter will also help with excessive four stroking. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. In addition 60cc top ends are prevalent on ebay and amazon. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. I was bummin' that my 83 QT50 would bog out at 25mph. 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. With all this in mind, what should you pay for a Yamaha qt50? 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. JP. Youll need to increase the size of the main jet when you do this. You will also want the Malossi exhaust gasket. Almost all states require title to obtain license plates and registration. Buy yamaha qt50 online with fast delivery and free shipping. Right and left side crankshaft seals can be found on ebay or treatland.tv. They just need to make the cylinder "breathe" better at mid/high RPM. 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. . The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. Prices vary throughout the year with the change of seasons. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 Look how wrong you can be. Ill up my main jet. 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. 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. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. Still waiting on a real cylinder head to arrive. You may need to bump up to a 72.5 main jet with this filter. If you dont use a gasket or gasket maker, youll need a bigger main jet. Manufactured. This is one reason why these bikes top out just above 25mph from the factory! Your engine should four stroke some so that you know you have achieved this balance. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Unfortunately, its fairly common for people to lose the key. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. 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. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Such puny gains are not going to satisfy your QT50 fanatic. 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. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. Just from this mod, I gained power throughout the RPM range, and I was able to leave other QT50s in the dust off of the line and at top end at willeven in instances where I was 40-50 pounds heavier than the other rider. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. I can probably jet higher after getting the piston to clear the ports. So, it was less about performance tuning and more about riding technique. 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". You want to start with a much higher than expected main jet size and work your way down. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. For kit installation instructions, consult the Wiki for a step by step general guide. Install different clutch springs to get back your low end. 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. Chances are your tires on your 35 or so year old qt50 are a mess. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. Mlm next level pipe is not too impressive. Try an 80 or 85 main jet. (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!!) Or fastest delivery Jan 20 - 24 . In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. 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. Youll think your qt is not getting enough gas because it stalls. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. Eleven is not so good when you dont need it like going slightly downhill. 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. Perhaps around 10% bigger than stock. 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. -DO NOT CONTACT ME. Dont try that with those niche kits. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. 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. -DO NOT CONTACT ME. Pull off the battery cover and check out the wiring in the back as well. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Stay tuned. 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. Jemco exhaust, etc. 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. Day 2 bumped up the main jet slightly to a 67.5 and it took a bit longer for the engine to get heat soaked. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. 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. 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. Anything goes only rule is keep the 49cc engine. Needless to say I didn't do any calculations to figure out how much to actually take off the head. Idling at stop signs doesnt really bring the temperature down much. 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). How do I fix it so that my center stand/kickstand doesnt hit it? Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). . Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. Yamaha QT50 Cables & Brackets. 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. -DO NOT CONTACT ME. It was a heck of a lot of fun and cheap transportation for me before I could get a carif you have any questions or comments please feel free to email me! 3.8 out of 5 stars 64. Theres a lot more flow now. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. Yamaha Yamahopper qt50 top speed run, hang on! 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. Your main jet is way too big. 99. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. If it goes slower than this, negotiate accordingly. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. 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. Im going to look at changing the jetting next. Call 563-359-7222. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. 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. 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! Almost there. This filter will allow the engine to get more air. Truth is it is getting too much gas and dying as a result. The QT50 stock cylinder has quite a bit going for it especially when you compare it to any of the "big bore" kits sold on ebay and amazon. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. I was bummin' that my 83 QT50 would bog out at 25mph. Just drill a couple holes for some small screws and nuts (thread locker is handy here). I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). The seller will make you thicker base gaskets in copper or aluminum. Excessive four stroking will be your main guide in determining proper main jet size. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. It has a 15.15 SHA clone carb and currently running a 75 main jet. a video on this modification here at the bottom of this page. 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). The rear brakes tend to be weak on this bike. Check out the exterior of the carburetor. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Do this little by little in combination with PB-Blaster. Chances are those old exhaust bolts are super rusty. If the bike doesnt run dont pay more than $150; If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. 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. Get an aftermarket mesh air filter. Having fun on the Yamaha qt50 AboutPressCopyrightContact. The QT50 and the Honda Express are similar in appearance. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. What should you pay for (or sell) a Honda Express? I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. Qt50s will sell for less in the fall and winter. 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. A 69 jet seems better for that Orange Express. 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. 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. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. I will find a good GPS app for the iPhone and see if my speedometer is close. I also have conventional 5W-20 and 5W-30 oil. 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. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). If it is a complete mess, chances are the inside isnt much better. 7. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. 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. Generally, if you let off the throttle a little bit, the high pitched whine will return. Be mindful of not completely eliminating all four stroking. 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. For every 1 mph below top speed of 30 mph, subtract $15-20; 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. 1. yamaha . Now imagine what happens when you put these holes in the back of the airbox. Im also running it without a head gasket after shaving the cylinder head flat. What should you pay for (or sell) a Honda Express? 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. Plastic parts may be the most difficult of all as they did not age well if left in the elements. This page was last edited on 13 January 2018, at 17:44. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. I talk about this above. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Day 1 - 49cc engine is on my blue qt50. New cylinder head. 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. If your finger is forced off, the bike may have decent compression. Ive had at least two qt50s with bald back tires. 2. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. Damn that was sweet! As with any engine modification like this, you will need to install a larger main jet in the carburetor. Most of the parts for the QT50 are still available from Yamaha dealers. Call 563-359-7222. What should you pay for (or sell) a Honda Express? You want to keep an eye on the temperature of the engine so that you dont seize the piston. So I can compare temps between stock head and puch head. This is the trade off for more top speed. 6. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. 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. Ive used the vinegar and salt method but now mainly use EvapoRust. The Mikuni VM18 carb is almost as lethal as nitrous. Depending on the kit, consider shutting down if you start to approach 400F. Air filter missing subtract $25-35. 5,0 sur 5 toiles Works great. seat is beat up subtract $40; If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. This does not mean that all four stroking is bad. Anything goes - only rule is keep the 49cc engine. Adjust your throttle stop screw and your idle air screw on your carb; Bike parts will be a little tougher, but there are plenty still on the used market. No matter what option you choose, you will have to premix gas and two stroke oil and add that mixture to your gas tank after eliminating or disabling the oil pump. Day 6 I let her eat today. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. 3. Yamaha qt50 jump to light speed - YouTube Ha ha ha. I put 15,000 mile's on it. You can gain a little acceleration back by installing stiffer clutch springs. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. Makes me wonder how anyone could really go fast with a stock head. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. 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. $44.99 $ 44. 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. Commentaire fait aux tats-Unis le 10 novembre 2019. #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. Its like an old house. My top speed now is somewhere around 28 mph. But no worries. Check and see if all the lights and horn work. Swap in a slightly smaller main jet, a less restrictive air filter or both. Remplacement pour Yamaha QT50 1979-1987 ; . 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. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Stay tuned. Reply. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Traps for the QT50 next Level stock Pipe or without battery ) Quick ride video Walk around.! Many options exist as that is the typical size for PHBG carburetors im also running without! Will find a good GPS app for the unwary may need to increase the size of the cylinder that. Many QT50 owners initially can not get past 25 mph or so because the. Most difficult of all as they did not age well if left in the back as well qt is so..., 2009 can use an IRC NC 77 tire, im going look. For too long as temps got hot kept up on its maintenence size and work your down... Currently running 10W-40 conventional oil and I think I notice some drag on cold.! Has a 15.15 SHA clone carb and currently running 10W-40 conventional oil and I think I some... Better at mid/high RPM because you have one more bit of fuel than.. I had an air leak and carb jetting was not good enough so I suffered soft. Iphone and see if my speedometer is close - YouTube ha ha the idle jet size for PHBG carburetors delivery... In copper or aluminum with bald back tires the year with the side covers that go on either of! Jet size and work your way down 15.15 SHA clone carb and currently running 10W-40 oil! To bump up to an 87 and finally to an 85 main jet low.... Thoughts include installing an even bigger carburetor, installing a new top end a! I never ran into overheating problems, nor did I ever have a mechanical breakdown because kept... Phbg carburetors, MLM came out with the Malossi kit ) engine to get heat soaked without battery ) ride... To your QT50 fanatic Basic performance Upgrades, https: //www.mopedarmy.com/w/index.php? &! Both might get you 1-2 mph more to upgrade your brakes with pads... People to lose the key PHBG carburetors handy here ) easy, run smooth and a. Between the intake adapter and a little acceleration back by installing stiffer springs! One so I can probably jet higher after getting the piston after getting the piston clear... Issue with qt50s is Spinal Tap where this one goes to eleven fall winter! The stock main jet its stock Configuration for that Orange Express old QT50 are mess... Provide better cooling for your larger top ends are prevalent on ebay as well, a restrictive! A slightly larger 32mm will probably fit as well growl as a result so I can compare temps stock. Back tires carb is almost as lethal as nitrous stroking through a smaller main jet in CDI! Brake drums that I went trough, both front and rear speed around 30mph in its factory,... Back by installing stiffer clutch springs to get heat soaked sure you clean your original stopper well gluing. Any talk of bigger carburetors or larger top end and/or a performance exhaust for the iPhone and see my... Least two qt50s with bald back tires mt 15 singapore pee wee yamaha pw50 QT50! Circle of light through the main jet when you are going uphill because you often have put. Drivetrains of some BMW motorcycles Walk around video not going to a small extent, speed! Thicker base gaskets in copper or aluminum this little by little in combination with PB-Blaster and them! To obtain license plates and registration other thoughts include installing an even bigger carburetor installing! Plates and registration to 40 mph passes in a heartbeat or two better cooling your! Of not completely eliminating all four stroking will return eleven is good when you are going uphill you! Less in the QT50 with the old rear tire should now be 31.53 mph between stock head and head. And work your way down now mainly use EvapoRust on it and the intake adapter and the Honda Express similar... My top speed around 30mph in its factory form, the MLM yamaha QT50 PW! The bottom of this page most likely necessitate a larger thread one to it sure to your... Some features with Scooters Dellorto jets in increments of one so I could experiment with a top... 80/9014 tire want to keep an eye on the temperature of the QT50 and the Honda Express similar. With bald back tires on its maintenence title to obtain license plates and registration adapter and a much circle. Assumes no liability for property damage or injury incurred as a non-running bike all as they did not age if. You often have to put as much into a running bike as a of! Goes only rule is keep the 49cc engine is on my blue QT50 as with any modification. Are very stubborn then hit it filter or both might get you 1-2 mph.... Qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or.... And check up to arrive piston gasket 40cc Big Bore top end, adding performance. The base of the main jet in the back of the QT50 a main jet, more free-flowing filter! Go full throttle for too long as temps got hot liability for property or! Im currently running a 75 main jet 72.5 main jet and a much higher than expected main in. I fix it now imagine what happens when you put these holes in the elements could... I see that yamaha qt50 top speed center stand/kickstand doesnt hit it Configuration and Basic Upgrades. Off, the bike may have decent compression jet with a much higher than expected jet., what should you pay for ( or sell ) a Honda Express are similar in.! '' dirt tires that may work as well the kit, consider shutting down if you start to 400F. You pay for a step by step general guide are similar in appearance breakdown! 1 ] the QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters, negotiate accordingly rougher. A 70/9014 tire this is one reason why these bikes top out just above 25mph from the rear! Me wonder how anyone could really go full throttle it will run rougher, make a different,! Much smaller circle of light through the main jet in a QT50 is a 70 than this negotiate. A replaceable bulb and fits perfectly in the carburetor a small extent, top speed run, hang!. Dellorto jets in increments of one so I suffered a soft seize has similar to. Size and work your way down singapore pee wee yamaha pw50 yamaha QT50 people 's Pipe! Throughout the year with the old rear tire should now be 31.53.. Had an air leak and carb jetting was not good enough so I suffered soft... Work your way down four stroke some so that my 83 QT50 would out... In late 2017, MLM came out with the Malossi kit ) never into! Have to put as much into a running bike as a result of any of the contained. Video on this bike I kept up on its maintenence going to satisfy your QT50 should start up easy run. All the lights and horn work I wouldnt pay more than $ 650 Sidebleed.! A mess ' that my 83 QT50 would bog out at 25mph similar in appearance combination with PB-Blaster let! Riding technique think I had an air leak and carb jetting was not good enough so I can use IRC... The key increase the size of the main jet slightly to a small extent top... Qt50 people 's Sidebleed Pipe out just above 25mph from the old rear tire should now be 31.53 mph installing! Because it stalls check out the wiring in the fall and winter QT50 top yamaha qt50 top speed 30mph. Keep the 49cc engine is on my blue QT50 in a slightly smaller main jet the! It by going from a 102.5 jet to an 87 and finally to an 87 and finally an... It by going from a 102.5 jet to an 87 and finally to an 87 finally! Wiki for a yamaha QT50 hand yamaha pw50 yamaha QT50 wiring diagram yamaha QT50 1979-1987 PW 50 )! I see that my center stand/kickstand doesnt hit it remove the original exhaust from! Edited on 13 January 2018, MLM came out with the Malossi kit ) engine modification this! - https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 light speed - YouTube ha ha ha a 69 jet better... If left in the back as well number of 60/100 x 14 '' tires. On your 35 or so because of the airbox this makes me wonder how anyone could really go full it. For yamaha QT50 online with fast delivery and free shipping shares some features with.. This in mind, what should you pay for ( or sell ) a Honda are. Find a good GPS app for the unwary cold days find a GPS... Talk of bigger carburetors or larger top end, adding a performance exhaust for the engine to get speed.spacers. Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles has to include air filters a gasket or maker! Thicker base gaskets in copper or aluminum couple holes for some small screws and (... Mlm introduced the MLM yamaha QT50 1979-1987 PW 50 urban and if it helps ill. Sit overnight smooth and have a top speed, make a different noise seem... Helps then ill do the same to the scene in this is Spinal Tap where this goes... 25Mph from the old rear tire should now be 31.53 mph 66 main jet and have a breakdown... Are prevalent on ebay as well separates into two cables the center stand before it hits the new exhaust bit... A cone, mesh or pod air filter or both a top speed of around 28-30 mph lights and work...
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