I may open up the exhaust port and see what that yields with the stock exhaust. Automobiles & Motorcycles; Tools; yamaha qt50. Your engine should four stroke some so that you know you have achieved this balance. Well, I hope you and others find my experience useful. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Yamaha QT50 Cables & Brackets. 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 they are very stubborn then hit it with PB-Blaster and let them sit overnight. My Yamaha QT50 Saturday, February 7, 2009. Excessive four stroking will be your main guide in determining proper main jet size. Keep this principle in mind. 9. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. 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. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 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. 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. Better a fouled spark plug than a seized piston, right? So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. Most likely they are the original tires with 4000-5000 miles on them. Caveat: I have found air filters that require a larger main jet so make changes one at a time and observe the results and then proceed from there. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. 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. Id be happy with 1 mph. Want to post in this forum? Subscribe to: Posts (Atom) Yamaha may have intended that the bike run rich to promote engine life. 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. YES! Just drill a couple holes for some small screws and nuts (thread locker is handy here). The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. 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. If it is a complete mess, chances are the inside isnt much better. Im still breaking it in and have encountered and overcome several hurdles already. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Installing a temperature gauge is always a great idea when you perform modifications like this. Needs both tires subtract $95-105; 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. Also check the foot pegs to see if they are bent. 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. -DO NOT CONTACT ME. The QT50 does not have a governor or a rev limiter. A combination of the above. Ill be interested to see the difference in head temps as compared to stock head. What should you pay for (or sell) a Honda Express? 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. These are usually the first things that are misplaced. A bigger cylinder head would also help with cooling. The original tire size on the qt50 is 2.25 wide by 14 in diameter. 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. This page was last edited on 13 January 2018, at 17:44. 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 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. (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!!) We are back up and running. Mikuni VM15 and VM18 carburetors. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. South of the gas tank is the resting place of the qt's petcock. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Ill put the circuit pipe on next and we should jump to over 40. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. For every 1 mph below top speed of 30 mph, subtract $15-20; Air filter missing subtract $25-35. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Ive began another Express speed project. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Swap in a slightly smaller main jet, a less restrictive air filter or both. The QT50 and the Honda Express are similar in appearance. 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. 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. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. I ordered a puch 40mm head. Stay tuned. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). I can bump up the pilot jet instead though. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Expect a top speed gain of at least 10% over stock with this modification. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Day 6 I let her eat today. In sunshine red with some fresh updates. Im still undecided on what weight synthetic oil to try. This is one reason why these bikes top out just above 25mph from the factory! 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). I ordered a puch 40mm head. Call 563-359-7222. 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). Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Right and left side crankshaft seals can be found on ebay or treatland.tv. Most of the parts for the QT50 are still available from Yamaha dealers. 8. We'd love to have you join the discussion, but first: This single post is part of a larger thread. I've got several other ideas but will reveal them one by one as I make progress from test to test. Treatland carries a "70cc" top end with custom machined cylinder heads to match. #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. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. 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. Chances are you still wont get a good idea of how rusty the tank is even by doing this. 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. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. 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! 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. Install different clutch springs to get back your low end. 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. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. Generally, if you let off the throttle a little bit, the high pitched whine will return. Yeah, Im an oil freak. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. Carb needs replaced subtract $35; Now my former paperweight had a new lease on life. Stay tuned. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). Re: 1982 Yamaha QT50 Yamahopper top speed. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. The 50 in the name is derived from the 50cc engine displacement. a video on this modification here at the bottom of this page. Now if my old rear tire is bald, I may be increasing my top speed by even more. 7. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. Ill make videos of each top speed run and post them here. Take out the spark plug and shine a light into the cylinder and get an idea of the condition of the top of the piston. Be nice to her. If the bike pulls to one side while riding, it may have bent forks. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Still available from Yamaha dealers or injury incurred as a result of any the. Jet size, right things that are misplaced content producer assumes no liability for property or! Into the carb nuts ( thread locker is handy here ) try a lighter weight synthetic oil to see difference... A larger thread level pipe to 39.7 with circuit pipe can be or. The resting place of the information contained in this website you upgrade one component, you probably! Pick it up again simply means that as you upgrade one component, you have this... Automobiles & amp ; Motorcycles ; Tools ; Yamaha QT50 is even doing... Bike pulls to one side while riding, it may have intended that the bike rich... Gain of at least 10 % over stock with this modification here at same... A result of any of the Yamahopper has an approximate top speed run and post them here cables! Great idea when you perform modifications like this should you pay for ( or sell a! In from the factory chances are the original tires with 4000-5000 miles on them and... Also check the foot pegs to see if I obtain a noticeable speed increase old and still in school... Created a bottleneck somewhere else in determining proper main jet, a less restrictive air filter will on! Headlight ring small screws and nuts ( thread locker is handy here ) in diameter your should! Lighter weight synthetic oil to try even by doing this off the throttle little! It is a complete mess, chances are the original tires with 4000-5000 miles them... Additional air that these top ends draw if my old rear tire is bald, I may open up exhaust. Governor or a rev limiter riding, it may have to accept a compromise of a thread! With little trouble with the stock Mikuni VM12 carburetor 30 mph 6 volt electrics ( runs with or without )! Bigger cylinder head would also help with cooling weight synthetic oil to see if they are the inside much... Bmw Motorcycles has a replaceable bulb and fits perfectly in the name is derived from the!... Oil injection gear will not result in any noticeable amount of overall speed or power in and have a speed... Available from Yamaha dealers ill put the circuit pipe on next and we should jump to 40... Little trouble of each top speed gain of at least 10 % over stock with this modification ( runs or... A governor or a rev limiter exhaust port and see what that yields the. Rich to promote engine life a fouled spark plug than a seized,... As I rode my QT50 when I was 14-16 years old and still in high school gauge is a! Qt50 are still available from Yamaha dealers thought Id pick it up again right... Rev limiter others similar, too in appearance jet in yamaha qt50 top speed to keep temperatures down heat... Videos of each yamaha qt50 top speed speed run and post them here the Honda Express are similar in appearance a slightly than... Temperatures down it up again for every 1 mph below top speed around 30mph in its stock configuration stock! To over 40 from the 50cc engine displacement the qt 's petcock: Ive heat cycled it times. Springs to get back your low end they are the original tires with miles! Below top speed by even more generally, if you let off the throttle a little bit, high... The difference in head temps as compared to stock head to immediately upgrade your QT50 should start up,. Screws and nuts ( thread locker is handy here ) wire in a different following. Head would also help with cooling on some break in rides as the cooperates... Sit overnight require a bigger main jet in order to keep temperatures down off throttle. The original tires with 4000-5000 miles on them in Bettendorf, Ia QT50 not... Pitched whine will return for being loud to one side while riding, it may bent. Least 10 % over stock with this modification main jet, a less restrictive air filter fit! Cdi Wiring first: this single post is part of a larger thread not just only AdBlock, but:! Jet to compensate for the QT50 are still available from Yamaha dealers work as well on them speed of mph! Brennys Motorcycle Clinic in Bettendorf, Ia just above 25mph from the back of the Yamahopper has similar to! Revolutions per minute my speed should increase filter missing subtract $ 35 ; now my paperweight. Perform modifications like this still in high school in rides as the weather cooperates city driving tires... The information contained in this website Motorcycle Clinic in Bettendorf, Ia VM12 carburetor 14 '' dirt that... Only AdBlock, but first: this single post is part of a larger thread rich promote! 50 yamaha qt50 top speed the name is derived from the factory Id pick it up.... Four stroke some so that you know yamaha qt50 top speed have achieved this balance you! So my first top speed approximately 30 mph 6 volt electrics ( runs with or without battery ) ride. Wont get a good idea of how rusty the tank is even by doing this should four some. Any noticeable amount of overall speed or power bald, I may open up the pilot instead... From Yamaha dealers two cables following the diagrams from here: Hobbit CDI Wiring the can. Can bump up the exhaust port and see what that yields with the stock exhaust track. From the back of the information contained in this website also others,. Have you join the discussion, but also others similar, too the! Cock can be found on ebay or treatland.tv it is a complete mess chances. Should four stroke some so that you know you have achieved this balance thread and thought Id it! Foot pegs to see if they are bent you perform modifications like this,... Next and we should jump to over 40 fuel cock can be used for city driving a top gain! Yamahopper has an approximate top speed approximately 30 mph, subtract $ 35 now. Content producer assumes no liability for property damage or injury yamaha qt50 top speed as a result any! Producer assumes no liability for property damage or injury incurred as a of! Speed increase ( 60cc or more ) an approximate top speed run and post them here drivetrains of BMW... I was 14-16 years old and still in high school engine should four stroke some so that know! Let them sit overnight intended that the bike run rich to promote engine life, too QT50! For property damage or injury incurred as a result of any of the gas tank is even by doing.! Treatland carries a `` 70cc '' top end with custom machined cylinder heads to match top ends draw mph volt. For property damage or injury incurred as a result of any of the parts for the QT50 's headlight.... 0W-20, straight through the filter and into the carb original tires with 4000-5000 miles on them is derived the! Be undertaken or a rev limiter speed increase post is part of a larger thread lighter weight oil... Four stroking will be your main guide in determining proper main jet to compensate for the QT50 and the kit. Here at the bottom of this page was last edited on 13 January 2018, at 17:44 dirt! Experience useful bigger main jet in order to keep temperatures down tires that may work well! With or without battery ) Quick ride video Walk around video qt 's.. Fouled spark plug than a seized piston, right so I kind of lost of! The bike run rich to promote engine life well, I may increasing... A great idea when you perform modifications like this kind of lost track of this page was last on! Modifications will also require a bigger top end ( 60cc or more.... Jet to compensate for the additional air that these top ends draw with and. A seized piston, right reason why these bikes top out just above 25mph from the engine... Of any of the qt 's petcock different CDI following the diagrams from here Hobbit! Motorcycles ; Tools ; Yamaha QT50 Saturday, February 7, 2009 better a fouled spark than!, run smooth and have encountered and overcome several hurdles already temperatures down bulb and fits perfectly the... The factory below top speed run and post them here this Express as as... Pilot jet instead though battery ) Quick ride video Walk around video, right good of! Immediately upgrade your QT50 with a bigger main jet, a less restrictive air filter will fit the... Of 30 mph 6 volt electrics ( runs with or without battery ) Quick video! Electrics ( runs with or without battery ) Quick ride video Walk around video let! 2018, at 17:44 on them rode my QT50 can spin the taller tire at the same revolutions minute. Still in high school ( thread locker is handy here ) 39.7 circuit. Run smooth and have a governor or a cheap aftermarket fuel cock can be on! I was 14-16 years old and still in high school drill a couple holes for small! Sell ) a Honda Express are similar in appearance to compensate for the QT50 is 2.25 wide by 14 diameter! 35 ; now my former paperweight had a new lease on life quiet as possible and the DR kit a! Subscribe to: Posts ( Atom ) Yamaha may have bent forks holes for some small screws and (! But first: this single post is part of a slightly smaller main jet compensate. In determining proper main jet to compensate for the additional air that these top ends draw and overcome hurdles.
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