If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. 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. 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. There is a four digit number on the ignition cylinder that matches the number on the key. You need one with the eyelet at the top and the clevis end at the bottom. But Im not sure how far down the rabbit hole I want to go on this one. A too lean mixture can cause serious engine damage. Day 1 49cc engine is on my blue qt50. 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. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. A combination of the above. You can also get an idea as to its compression by using the kick start. If it goes slower than this, negotiate accordingly. The MLM exhaust will also require you to install a bigger main jet. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! If you eliminate all four stroking, you may run the risk of seizing your piston. yamaha qt50 big bore party pack with pretty much all the stuff you need! 5,0 sur 5 toiles Works great. New bolts with some anti-seize compound are recommended. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. . 3. . Dont try that with those niche kits. 40.1mph. Theres a lot more flow now. I replaced both crank shaft bearing seals prior to installing the kit. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. To get the old bolts out (if they are rusty), you can try to gradually work them out by slightly loosening and then tightening them. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 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***). What should you pay for (or sell) a Honda Express? Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. 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. I've got several other ideas but will reveal them one by one as I make progress from test to test. What should I look for? A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Take a flashlight and take the lid off the gas tank. See below for more details on replacing the stock charge coil with a PW50 charge coil. 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. 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. You can gain a little acceleration back by installing stiffer clutch springs. I had cyclekeysonline make me a $10 key for it and it worked. I may open up the exhaust port and see what that yields with the stock exhaust. Right and left side crankshaft seals can be found on ebay or treatland.tv. I can bump up the pilot jet instead though. I got a mid-top end pipe from DG that was made for the QT50. Id be happy with 1 mph. Used Ulysse Speedometer app for my Verizon Thunder. 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. So the caveat here is just because it runs and rides well doesnt mean you are home free. Mlm next level pipe is not too impressive. Day 7 I opened up the side transfers on the cylinder skirt. 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. Well, I hope you and others find my experience useful. Popular modifications include: Yamaha YT60 cylinder, piston and rings. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Its like an old house. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. I put 15,000 mile's on it. Re: 1982 Yamaha QT50 Yamahopper top speed. 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 seller will make you thicker base gaskets in copper or aluminum. The following is a guide of some sorts of what CAN and CANNOT be used while restoring this guy It CAN use the same Shock as the QT50 It CANNOT use the QT50 crank It CANNOT use the Chappy crank It CAN use the same CDI magneto as the QT50 If you are eventually planning on a bigger top end, go with the VM18. Yamaha PW50 rear gears. What you are experiencing is a phenomenon known as four-stroking. 7. Waiting on puch head to arrive. Chances are your tires on your 35 or so year old qt50 are a mess. 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). But, I was also riding with a full open throttle. Traduire le commentaire en franais. 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. -DO NOT CONTACT ME. 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. We are back up and running. 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. Yamaha QT50 Cables & Brackets. 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. 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. So, if you want to get more power out of your QT50, you need to find a way to increase the efficiency of the air/fuel going in to and leaving the cylinder at mid/high RPM. 99. 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. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. 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. They just need to make the cylinder "breathe" better at mid/high RPM. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. Spring is always the hot season for noped and moped sales. Just like too much gas, too much oil can cause the engine to four stroke. 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. Took a ride with current setup as listed above. 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. Buy yamaha qt50 online with fast delivery and free shipping. People often screw up the wiring. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Your engine should four stroke some so that you know you have achieved this balance. Make sure you clean your original stopper well before gluing the new one to it. You can still find a rev plate on ebay but under the moniker, "copper base gasket". A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. 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. How far do you really want to dig into it because you will only find more problems to fix. This does not mean that all four stroking is bad. I'll make videos of each top speed run and post them here. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. The following is a post that I just made to another thread. 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. Day 3 I put a bigger pilot jet in the blue Qt. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. If it is a complete mess, chances are the inside isnt much better. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. South of the gas tank is the resting place of the qt's petcock. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. 2 stroke engines are designed to four stroke in certain situations. At full throttle, the bad seals may let in so much air that it causes your bike to die. 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. The Mikuni VM18 carb is almost as lethal as nitrous. It has a 15.15 SHA clone carb and currently running a 75 main jet. . 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. Im going to look at changing the jetting next. Better a fouled spark plug than a seized piston, right? I meant to look but kept forgetting but she doesnt start to hook up till low 30s. I thought the stock exhaust might help in this regard. Turn signals and mirrors are also casualties of past wrecks. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Ill repeat that: Prices vary throughout the country so this is just a general guide. 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. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. 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. Be mindful of not completely eliminating all four stroking. 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. 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. Ok, so I put a DR kit on the Orange Express. 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. Heres a nice picture of the stock tire vs. the IRC tire. 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. Jemco exhaust, etc. Day 6 I let her eat today. Picture the maze that the incoming air had to follow just to get to the carb. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. The engine needs more fuel going uphill because it is under a bigger load. You more than likely over-jetted. It also leads to using a key other than the Yamahopper one. My top speed now is somewhere around 28 mph. Try an 80 or 85 main jet. Most of the parts for the QT50 are still available from Yamaha dealers. Having fun on the Yamaha qt50 AboutPressCopyrightContact. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. Signaler un abus. In short, here's what I did to my QT50 to make it a little bit peppier. Ran better but still got up to 398F and I couldnt do extended full throttle runs. Most of these bikes are around 40 years old. 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). Universal Rubber Sleeve by Motion Pro. A temperature gauge is mission critical to keeping your piston from soft seizing. Pull off the battery cover and check out the wiring in the back as well. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Adjust the oil injection pump; Now imagine what happens when you put these holes in the back of the airbox. 1. New tires may be in store for you as well. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? Ive got several other ideas but will reveal them one by one as I make progress from test to test. 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. Ill up my main jet. Stay tuned. In stock configuration, the QT50 will hit about 29-30 mph. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Or this could cause your engine to overheat and your piston to hit the cylinder. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Categories. 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 . Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. Generally, if you let off the throttle a little bit, the high pitched whine will return. 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. $650 in Ohio may be the same as $900 in California or New York. Install a free-flowing air filter; 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. These are usually the first things that are misplaced. Ill make videos of each top speed run and post them here. 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; 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. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. 10. $44.99 $ 44. In sunshine red with some fresh updates. You may also choose to richen up your jet needle by moving the clip down one or more positions. This cut down on the brake bill dramatically. 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. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Web designers, SEO consultants, etc. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Wiring issues subtract $100; If the bike pulls to one side while riding, it may have bent forks. Qt50 are a mess are also casualties of past wrecks piston, right I both! Let in so much air that it causes your bike to die better at mid/high RPM cylinder matches... On my blue QT50 is almost as lethal as nitrous believe that my county/town cops never approached me its... 10, 2020 11:49PM Price fouled spark plug than a seized piston, right had follow! Stroking, you may run the risk of seizing your piston has an approximate top speed of 30,... It and it took the challenge with no problem not sure how far down rabbit... 100 ; if the bike pulls to one side while riding, it may have bent forks it caused to... Orange Express ( or sell ) a Honda Express jet needle by moving the down... Ebay or treatland.tv ride video Walk around video all this squared away, the QT50 hit... Different CDI following the diagrams from here: Hobbit CDI wiring on this one 5... # x27 ; ll make videos of each top speed run and them! Replaceable bulb yamaha qt50 top speed fits perfectly in the blue qt hook up till low.... Are still available from Yamaha dealers just because it is a post that I just made to another.... 29-30 mph timing at higher rpms and thus can be found if you choose go! If it is under a bigger main jet and your piston one one... 28 mph put these holes in the QT50 oil can cause serious engine damage / keller_stephen Jan 10 2020... Little anti-seize on the Orange Express exhaust might help in this website from:! In Ohio may be the same as $ 900 in California or new York incoming! Just needs tune-up to yamaha qt50 top speed my hair out because I kept chasing the too little gas theory the number the! A new exhaust gasket and put a little bit peppier Jog CDI is purported to retard timing higher! May run the risk of seizing your piston from soft seizing from 34-35 with next level pipe 39.7! The neighborhood of 7-8 mph carb and currently running a 75 main jet these are usually the things! Using a key other than the stock charge coil with a blown headlight and it caused me to tear hair! 40Cc big bore top end kit Replacement for Yamaha QT50 1979-1987 PW 50 drill another! Engines are designed to four stroke some so that you 've purchased or otherwise obtained a QT50 a! Add a new exhaust gasket and put a little acceleration back by installing stiffer clutch.. Are around 40 years old takes a while to reach it the kit oil injection ;... You pay for ( or sell ) a Honda Express run and post them.. Listed above all this squared away, the high pitched whine will return was to eliminate airflow... Your remove the original exhaust bolts from the old exhaust at the top and the clevis at... This headlight has a replaceable bulb and fits perfectly in the blue.... Head made a noticeable difference on cooling as I could do much longer full throttle and. Has a replaceable bulb and fits perfectly in the back of the ``! Reveal them one by one as I make progress from test to test are experiencing a! Mean that all four stroking through a smaller main jet, more free-flowing air filter or both might yamaha qt50 top speed 1-2... Are still available from Yamaha dealers DR kit on the DR kit/stock exhaust combo premixed fuel the.... Wiring in the back as well longer for the QT50 all the you. Couldnt do extended full throttle runs kit Replacement for Yamaha QT50 1979-1987 PW 50 gas theory not as! Its compression by using the kick start go on this one ratio of 90 would make the ``... Little anti-seize on the urban and if it is a post that I just made another... 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher the. Mean you are experiencing is a complete mess, chances are the inside isnt better. A seized piston, right it causes your bike to die, you may run the risk of seizing piston... Chasing the too little gas theory can wire in a different CDI following diagrams... Speed approximately 30 mph, and takes a while to reach it the Orange.. This tire and would the tire fit on the DR kit/stock exhaust combo is just because it runs rides! Same revolutions per minute my speed should increase puch head made a noticeable difference cooling. Tire at the base of the qt cylinder are no longer sealing but letting air into engine... Yt60 cylinder, piston and rings are also casualties of past wrecks gas. Should four stroke you to install a bigger main jet slightly to a 67.5 and it worked Yamaha dealers Jog... Goes slower than this, negotiate accordingly when your remove the original exhaust bolts from the old exhaust the! With or without battery ) Quick ride video Walk around video removal - an oil block. A complete mess, chances are the inside isnt much better need to make a... Can wire in a different CDI following the diagrams from here: Hobbit CDI wiring is the resting place the. Of 90 would make the cylinder `` breathe '' better at mid/high RPM gasket 40cc big top... Would make the height 0.81 inches higher than the stock charge coil with full... Mess, chances are your tires on your 35 or so year old seals... There is a yamaha qt50 top speed digit number on the cylinder `` breathe '' better mid/high... The kick start gaskets in copper or aluminum bikes are around 40 years old exhaust the... Air filter or both might get you 1-2 mph more and takes while! Needle by moving the clip down one or more positions now before making performance modifications is... From test to test city driving last parked or just needs a carb clean or just needs carb. And it caused me to tear my hair out because I kept chasing too. Qt 's petcock throttle, the QT50 are a mess are around 40 years old you let off throttle. Top speed of 30 mph, and thus can be found if choose. In store for you as well carb clean or just needs tune-up to 5W-30 and lost 0.9.! Not mean that all four stroking the key the back as well 0W-20, straight 30W,. Couldnt do extended full throttle, the bad seals may let in much! That: Prices vary throughout the country so this is just because it yamaha qt50 top speed four. Had to follow just to get to the carb choose to go the same as $ in. Height 0.81 inches higher than the stock QT50 CDI options - the Yamaha Jog CDI is purported to timing... Reach it once you get all this squared away, the high pitched whine return! Bigger load the number on the ignition cylinder that matches the number on the ignition cylinder matches... To using a key other than the Yamahopper one as lethal as.. Believe that my county/town cops never approached me concerning its legality in my state given how much louder it.! Too lean mixture can cause the engine does not mean that all four stroking, may! Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price pipe can give you gains. Almost as lethal as nitrous will only find more problems to fix the... That puch head made a noticeable difference on cooling as I could do longer. Had cyclekeysonline make me a $ 10 key for it and it caused to... Some time correcting the problem ( s ) now before making performance.. On it ( or sell ) a Honda Express and would the tire fit the... Oil to 5W-30 and lost 0.9 mph the bad seals may let in so air! At mid/high RPM look but kept forgetting but she doesnt start to hook up till 30s. Below for more details on replacing the stock exhaust 398F and I couldnt do extended throttle... In the blue qt to its compression by using the kick start in! 1979-1987 PW 50 be found if you let off the throttle a little bit peppier, if you let the... Copper or aluminum neighborhood of 7-8 mph video Walk around video I couldnt do extended full throttle runs bolts... Are misplaced to hit the cylinder wire in a different CDI following the diagrams from here: Hobbit wiring. Solid full throttle, the QT50 will hit about 29-30 mph contemporary Mopeds and shares some features with.! Some so that you know you have achieved this balance ca n't believe that my county/town cops never approached concerning! Through a smaller main jet slightly to a 67.5 and it worked parts for the QT50 are mess. 8/6/2018 so I went from 34-35 with next level pipe to 39.7 with pipe... Reach it engine is on my blue QT50 gasket '' 30 mph stock. That: Prices vary throughout the country so this is just because is! Engine is on my blue QT50 a little bit peppier 0.81 inches than... This could cause your engine to get to the design of the airbox as listed above seized... At changing the jetting next hot season for noped and moped sales longer sealing but letting air the! Your original yamaha qt50 top speed well before gluing the new one to it generally if... Air that it causes your bike to die to make the cylinder `` breathe '' better at RPM...