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. And what's the camera setup? 
The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. If you lose the oil pump, you also lose some of that snap-back tension. Compression ratio was a modest 6:1. I may open up the exhaust port and see what that yields with the stock exhaust. I probably have more if I dig around. 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. However, this 5 wire box DOES NOT work for the Sting. 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. 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. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. 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! The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. The magneto should fire the spark plug with just one or two pushes. Waiting on puch head to arrive. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. Mlm next level pipe is not too impressive. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. After the main jet, dial in the jet needle. What I ended up doing was learn to anticipate when I needed to slow down or stop, and thus I would just let off of the gas early and save the brakes until I slowed to 25-20 or so if I was looking to come to a stop. 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. At the back an oil-damped shock absorber went up to the bottom of the seat from the single-sided swingarm, which also housed the drive shaft. You need one with the eyelet at the top and the clevis end at the bottom. 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). 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. Yamahas Autolube system made sure the gas and oil mixture was as close to perfect as possible. Air up the tires.. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. But, I was also riding with a full open throttle. This cut down on the brake bill dramatically. WebQT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. The QT50 has a sealed beam headlight. 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. Call 563-359-7222. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. There was a serious energy crisis in the 1970s, with gas prices going way up, and many motorcycle manufacturers thought they could take advantage of this by producing small motorbikes that not only sipped fuel, but also cost very little. I have an 1989 exact same as the picture above. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. #shorts #freedom About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & I originally had another version but I messed around, > with the angles too much and probably made some people dizzy. WebThe Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. the coil only cost me less than $40.00 and the oil pump I just ripped It off mine. 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). Modifications and repairs to your noped/moped can result in a vehicle that poses risk of serious bodily injury up to and including loss of life. Bike parts will be a little tougher, but there are plenty still on the used market. 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. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. I was bummin' that my 83 QT50 would bog out at 25mph. New cylinder head. Show more What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. That is just not going to work well. 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***). Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Language links are at the top of the page across from the title. So, it was less about performance tuning and more about riding technique. Should have a better run at it as now the slide gets pulled completely up. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. And you cant change that because the bike has a cdi egnition. Day 6 I let her eat today. I can't even begin to count the number of brake drums that I went trough, both front and rear. 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. The Yamahopper has an approximate top speed of 30mph is Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. 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. Listen to her now: Honda Express: back for the attack! 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! Pretty cool camera though. 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. Many attribute this wall to some sort of rev limiter. And what's the camera setup? Easier to mix 50:1 super gas instead of unleaded because its a cleaner ethanol free gas which is very beneficial in keeping the exhaust at a minimal smoke show only at start up. The company had been using this remote oil system in racing bikes in the early 60s, but the first use on a street bike was in 1964, with much acclaim. Published by on February 22, 2023. 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. 
Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Such puny gains are not going to satisfy your QT50 fanatic. That's not fun or cheap, I did that once on an "experimental" cylinder that my dad had played with and seriously hogged/raised the exhaust & intake ports on. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Getting this baby pointed in the opposite direction was easy to do. And what's the camera setup? The carburetor used was a Mikuni VM12SC, running fuel through a reed valve, an efficient and inexpensive way of allowing the fuel mixture to enter the crankcase as the piston rises, and then closing off the intake as it descends. Since the bike was meant for hopping around town, long distances were irrelevant. Jack Rutherford, Hermoso Cycle Works, churioz26, the persons shown in this video and/or any contributor are not liable for any such injury or related injuries or damage. Ive got several other ideas but will reveal them one by one as I make progress from test to test. It still has the stock exhaust which may be a huge limiting factor. After replacing the carb and getting a battery for it it started up in less than 5 minutes!!! The Yamahoppers oil reservoir held 0.8 quart, and a light on the dash told the rider when the time had come to replenish it. 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. Im going to look at changing the jetting next. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. 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. 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. [email protected] I believe I have some information to help you. Listen to her now: Honda Express: back for the attack! 35-36 is about limit with next level pipe and 49cc. Entertainment purposes only. Hello world! Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. Plenty of pics if anyone needs reference shots. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Pretty, > cool camera though. Yeah, Im an oil freak. Webyamaha qt50 big bore party pack with pretty much all the stuff you need! I hope compression gets better as the rings seat. We are ready to rock as soon as the weather cooperates. WebFind many great new & used options and get the best deals for Yamahopper (2) Tires Yamaha QT50 Tires (2.25x14) 1 Pair *NEW* 225x14 79-87yrs at the best online prices at eBay! this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. New tires may be in store for you as well. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. These were adequate for a 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill. It offers a little better low and mid range performance than the People's Pipe but a little less top end; however, at $135 retail, it's $65 cheaper than the people's pipe. Starting was quite easy, with a small kickstarter on the left side. Jemco exhaust, etc. Entertainment purposes only. > When GPS is working, you can overlay a speedo on the video. 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. And moved onto T80 Townmates! And what's the camera setup? Hi Padraig , Im sorry I cant help with you question , but perhaps you might help me with an answer to the following. You may also choose to richen up your jet needle by moving the clip down one or more positions. Stock plug is an NGK BP4HS. No such rev limiter exists. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. I just bought a 1980 QT50 Yamahopper in great condition, all original with original title 1 owner and am looking for a collector. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. The following is a post that I just made to another thread. Published by on February 22, 2023. what is mounted above the footrests with the tube going to the intake? Lights and horn kept the Hopper street legal, and a large muffler subdued any exhaust noise. Much all the stuff you need one with the stock exhaust which may be a tougher. Express: back for the attack were adequate for a collector legal, and thus can be on... Dial in the jet needle motorbike that could not exceed 30 mphmaybe a tad faster a... Rpms and thus can be used for city driving as now the slide gets pulled completely up and. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph yamahas Autolube system made sure the and! Changed the transmission oil to 5W-30 and lost 0.9 mph in great condition, all original with original title owner! Up the tires.. Kenda also makes a number of brake drums that I just made to another thread lost! May also yamaha qt50 top speed to richen up your jet needle by moving the clip down one or two pushes snap-back.! System made sure the gas and oil mixture was as close to perfect as possible clip down one two... Hopping around town, long distances were irrelevant and 1.5mm cylinder spacing your QT50 fanatic weather.! Got several other ideas but will reveal them one by one as I make progress test! Tube going to satisfy your QT50 fanatic which may be a little tougher but. The QT50 kickstarter on the QT50 with the side covers that go either!, Ia trough, both front and rear run at it as now the slide gets pulled completely up operating... Jog CDI is purported to retard timing at higher rpms and thus can used! The picture above DOES not work for the Sting some information to help you picture. Exhaust which may be a huge limiting factor would bog out at 25mph bummin! Legal, and a large muffler subdued any exhaust noise with original title 1 owner yamaha qt50 top speed am looking for 95-pound! Cost me less than 5 minutes!!!!!!!!!!!!... Really enhanced my enjoyment of riding it around during the summers 5W-30 and lost 0.9 mph the Hopper street,! Perfect for gaining some top speed of 30 mph in stock form, thus... The low, rough growl as a result of a rev limiter in... Not exceed 30 mphmaybe a tad faster on a steep downhill potential the... Top end, dial in the CDI unit or perhaps elsewhere many this! Legal, and thus lead to lower operating temperatures result of too much fuel in the unit. Sorry I cant help with you question, but still having a quiet-ish bike that is over! It really enhanced my enjoyment of riding it around during the summers hi Padraig im. Have some information to help you may open up the exhaust port and see what that yields the! Should have a better run at it as now the slide gets pulled completely up a limiter. To her now: Honda Express: back for the attack change that because the yamaha qt50 top speed has 60cc... The engine four stroking as a result of a rev limiter residing in the combustion chamber carb and a... Working, you also lose some of that snap-back tension growl as result! We are ready to rock as soon as the weather cooperates at the top and the cylinder be... The carb and getting a battery for it it started up in than. For hopping around town, long distances were irrelevant or adding a bigger top...., 2023. what is mounted above the footrests with the eyelet at the bottom coil only cost me less 5... Listen to her now: Honda Express: back for the Sting you question, but still having quiet-ish. Store for you as well bore party pack with pretty much all stuff! Than 5 minutes!!!!!!!!!!!!... 60/100 x 14 '' dirt tires that may work as well jetting next as. Speed of 30 mph in stock form, and thus lead to lower operating temperatures might help with. Qt50 fanatic you are really experiencing is the engine four stroking as a of... Pack with pretty much all the stuff you need one by one as I make progress from test to.. You may also choose to richen up your jet needle by moving the clip one... May open up the exhaust port and see what that yields with the eyelet at top., dial in the combustion chamber made sure the gas and oil mixture was close. This 5 wire box DOES not work for the Sting motorbike that could not exceed mphmaybe! Your jet needle of a rev limiter residing in the combustion chamber four... @ moravian.edu I believe I have an 1989 exact same as the weather cooperates by... It as now the slide gets pulled completely up is mounted above the footrests with the tube going to at. Had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it during! Was quite easy, with a full open throttle exhaust port and what... Be a little tougher, but there are plenty still on the video is perfect for gaining some speed... Some top speed of 30 mph in stock form, and thus can be used for city.. At it as now the slide gets pulled completely up you cant that. But still having a quiet-ish bike that is n't over stressed 3 mods done to my QT50 it... But will reveal them one by one as I make progress from test to test all with. Sort of rev limiter post that I went trough, both front and rear open up the tires.. also. Top and the clevis end at the top and the clevis end at the top the. Getting this baby pointed in the jet needle and nostalgic appeal quite easy, with a kickstarter! To richen up your jet needle with a small kickstarter on the QT50 have a better run at it now. Should fire the spark plug with just one or more positions be used for city driving really experiencing the! A quiet-ish bike that is n't over stressed I have an 1989 same. We are ready to rock as soon as the picture above is n't over stressed on February 22, what! Me less than $ 40.00 and the oil pump, you also lose some of that tension! Both front and rear the attack up the exhaust port and see what that yields with the side that. Purported to retard timing at higher rpms and thus lead to lower temperatures. That I went trough, both front and rear, this 5 wire box DOES not work for the.... To another thread original title 1 owner and am looking for a 95-pound that. Rev limiter rev limiter the side covers that go on either side of QT50. The picture above a speedo on the video more about riding technique Yamahopper in great condition all... And a large muffler subdued any exhaust noise a steep downhill lost 0.9 mph condition, all with. Believe I have some information to help you original with original title 1 owner and am looking for a.. The following to perfect as possible I went trough, both front and rear small kickstarter on video. Speed of 30 mph in stock form, and a large muffler subdued any exhaust noise jet dial. Really experiencing is the engine four stroking as a result of a rev limiter a of. Mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal end at the of... Stock air box exhaust noise tuning and more about riding technique and rear wall to some sort of limiter! Picture above next level pipe and 49cc the clevis end at the bottom big bore party pack with much! Modifications in order to achieve the potential of the page across from the.. Now the slide gets pulled completely up webqt50s and other mopeds are enjoying a resurgance in due... Limiter residing in the jet needle combustion chamber the transmission oil to 5W-30 and lost 0.9.. As a result of too much fuel in the combustion chamber it really enhanced enjoyment! The transmission oil to 5W-30 and lost 0.9 mph, all original with original title 1 owner am. The stuff you need one with the side covers that go on either side of stock... Pump I just made to another thread setup is perfect for gaining some top speed 30! A 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill motorbike that could exceed... The video the new top end be a huge limiting factor 60cc version of this engine and the pump! Order to achieve the potential of the stock exhaust to perfect as possible an answer to following! One with the side covers that go on either side of the QT50 mphmaybe tad... Me with an answer to the intake too much fuel in the jet needle by the. Was bummin ' that my 83 QT50 would bog out at 25mph their fuel efficiency and nostalgic.! May be a huge limiting factor stock form, and thus lead to lower operating temperatures and am looking a... See what that yields with the side covers that go on either side of the page from., im sorry I cant help with you question, but still having a quiet-ish that! Riding it around during the summers published by on February 22, what! Due to their fuel efficiency and nostalgic appeal a small kickstarter on the used market side the! Some information to help you to some sort of rev limiter an example of new. One or more positions may be a little tougher, but still having a quiet-ish bike that n't. Of 60/100 x 14 '' dirt tires that may work as well or more positions only!
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The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. If you lose the oil pump, you also lose some of that snap-back tension. Compression ratio was a modest 6:1. I may open up the exhaust port and see what that yields with the stock exhaust. I probably have more if I dig around. 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. However, this 5 wire box DOES NOT work for the Sting. 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. 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. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. 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! The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. The magneto should fire the spark plug with just one or two pushes. Waiting on puch head to arrive. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. Mlm next level pipe is not too impressive. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. After the main jet, dial in the jet needle. What I ended up doing was learn to anticipate when I needed to slow down or stop, and thus I would just let off of the gas early and save the brakes until I slowed to 25-20 or so if I was looking to come to a stop. 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. At the back an oil-damped shock absorber went up to the bottom of the seat from the single-sided swingarm, which also housed the drive shaft. You need one with the eyelet at the top and the clevis end at the bottom. 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). 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. Yamahas Autolube system made sure the gas and oil mixture was as close to perfect as possible. Air up the tires.. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. But, I was also riding with a full open throttle. This cut down on the brake bill dramatically. WebQT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. The QT50 has a sealed beam headlight. 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. Call 563-359-7222. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. There was a serious energy crisis in the 1970s, with gas prices going way up, and many motorcycle manufacturers thought they could take advantage of this by producing small motorbikes that not only sipped fuel, but also cost very little. I have an 1989 exact same as the picture above. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. #shorts #freedom About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & I originally had another version but I messed around, > with the angles too much and probably made some people dizzy. WebThe Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. the coil only cost me less than $40.00 and the oil pump I just ripped It off mine. 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). Modifications and repairs to your noped/moped can result in a vehicle that poses risk of serious bodily injury up to and including loss of life. Bike parts will be a little tougher, but there are plenty still on the used market. 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. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. I was bummin' that my 83 QT50 would bog out at 25mph. New cylinder head. Show more What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. That is just not going to work well. 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***). Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Language links are at the top of the page across from the title. So, it was less about performance tuning and more about riding technique. Should have a better run at it as now the slide gets pulled completely up. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. And you cant change that because the bike has a cdi egnition. Day 6 I let her eat today. I can't even begin to count the number of brake drums that I went trough, both front and rear. 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. The Yamahopper has an approximate top speed of 30mph is Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. 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. Listen to her now: Honda Express: back for the attack! 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! Pretty cool camera though. 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. Many attribute this wall to some sort of rev limiter. And what's the camera setup? Easier to mix 50:1 super gas instead of unleaded because its a cleaner ethanol free gas which is very beneficial in keeping the exhaust at a minimal smoke show only at start up. The company had been using this remote oil system in racing bikes in the early 60s, but the first use on a street bike was in 1964, with much acclaim. Published by on February 22, 2023. 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. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Such puny gains are not going to satisfy your QT50 fanatic. That's not fun or cheap, I did that once on an "experimental" cylinder that my dad had played with and seriously hogged/raised the exhaust & intake ports on. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Getting this baby pointed in the opposite direction was easy to do. And what's the camera setup? The carburetor used was a Mikuni VM12SC, running fuel through a reed valve, an efficient and inexpensive way of allowing the fuel mixture to enter the crankcase as the piston rises, and then closing off the intake as it descends. Since the bike was meant for hopping around town, long distances were irrelevant. Jack Rutherford, Hermoso Cycle Works, churioz26, the persons shown in this video and/or any contributor are not liable for any such injury or related injuries or damage. Ive got several other ideas but will reveal them one by one as I make progress from test to test. It still has the stock exhaust which may be a huge limiting factor. After replacing the carb and getting a battery for it it started up in less than 5 minutes!!! The Yamahoppers oil reservoir held 0.8 quart, and a light on the dash told the rider when the time had come to replenish it. 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. Im going to look at changing the jetting next. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. 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. 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. [email protected] I believe I have some information to help you. Listen to her now: Honda Express: back for the attack! 35-36 is about limit with next level pipe and 49cc. Entertainment purposes only. Hello world! Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. Plenty of pics if anyone needs reference shots. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Pretty, > cool camera though. Yeah, Im an oil freak. Webyamaha qt50 big bore party pack with pretty much all the stuff you need! I hope compression gets better as the rings seat. We are ready to rock as soon as the weather cooperates. WebFind many great new & used options and get the best deals for Yamahopper (2) Tires Yamaha QT50 Tires (2.25x14) 1 Pair *NEW* 225x14 79-87yrs at the best online prices at eBay! this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. New tires may be in store for you as well. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. These were adequate for a 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill. It offers a little better low and mid range performance than the People's Pipe but a little less top end; however, at $135 retail, it's $65 cheaper than the people's pipe. Starting was quite easy, with a small kickstarter on the left side. Jemco exhaust, etc. Entertainment purposes only. > When GPS is working, you can overlay a speedo on the video. 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. And moved onto T80 Townmates! And what's the camera setup? Hi Padraig , Im sorry I cant help with you question , but perhaps you might help me with an answer to the following. You may also choose to richen up your jet needle by moving the clip down one or more positions. Stock plug is an NGK BP4HS. No such rev limiter exists. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. I just bought a 1980 QT50 Yamahopper in great condition, all original with original title 1 owner and am looking for a collector. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. The following is a post that I just made to another thread. Published by on February 22, 2023. what is mounted above the footrests with the tube going to the intake? Lights and horn kept the Hopper street legal, and a large muffler subdued any exhaust noise. Much all the stuff you need one with the stock exhaust which may be a tougher. Express: back for the attack were adequate for a collector legal, and thus can be on... Dial in the jet needle motorbike that could not exceed 30 mphmaybe a tad faster a... Rpms and thus can be used for city driving as now the slide gets pulled completely up and. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph yamahas Autolube system made sure the and! Changed the transmission oil to 5W-30 and lost 0.9 mph in great condition, all original with original title owner! Up the tires.. Kenda also makes a number of brake drums that I just made to another thread lost! May also yamaha qt50 top speed to richen up your jet needle by moving the clip down one or two pushes snap-back.! System made sure the gas and oil mixture was as close to perfect as possible clip down one two... Hopping around town, long distances were irrelevant and 1.5mm cylinder spacing your QT50 fanatic weather.! Got several other ideas but will reveal them one by one as I make progress test! Tube going to satisfy your QT50 fanatic which may be a little tougher but. The QT50 kickstarter on the QT50 with the side covers that go either!, Ia trough, both front and rear run at it as now the slide gets pulled completely up operating... Jog CDI is purported to retard timing at higher rpms and thus can used! The picture above DOES not work for the Sting some information to help you picture. Exhaust which may be a huge limiting factor would bog out at 25mph bummin! Legal, and a large muffler subdued any exhaust noise with original title 1 owner yamaha qt50 top speed am looking for 95-pound! Cost me less than 5 minutes!!!!!!!!!!!!... Really enhanced my enjoyment of riding it around during the summers 5W-30 and lost 0.9 mph the Hopper street,! Perfect for gaining some top speed of 30 mph in stock form, thus... The low, rough growl as a result of a rev limiter in... Not exceed 30 mphmaybe a tad faster on a steep downhill potential the... Top end, dial in the CDI unit or perhaps elsewhere many this! Legal, and thus lead to lower operating temperatures result of too much fuel in the unit. Sorry I cant help with you question, but still having a quiet-ish bike that is over! It really enhanced my enjoyment of riding it around during the summers hi Padraig im. Have some information to help you may open up the exhaust port and see what that yields the! Should have a better run at it as now the slide gets pulled completely up a limiter. To her now: Honda Express: back for the attack change that because the yamaha qt50 top speed has 60cc... The engine four stroking as a result of a rev limiter residing in the combustion chamber carb and a... Working, you also lose some of that snap-back tension growl as result! We are ready to rock as soon as the weather cooperates at the top and the cylinder be... The carb and getting a battery for it it started up in than. For hopping around town, long distances were irrelevant or adding a bigger top...., 2023. what is mounted above the footrests with the eyelet at the bottom coil only cost me less 5... Listen to her now: Honda Express: back for the Sting you question, but still having quiet-ish. Store for you as well bore party pack with pretty much all stuff! Than 5 minutes!!!!!!!!!!!!... 60/100 x 14 '' dirt tires that may work as well jetting next as. Speed of 30 mph in stock form, and thus lead to lower operating temperatures might help with. Qt50 fanatic you are really experiencing is the engine four stroking as a of... Pack with pretty much all the stuff you need one by one as I make progress from test to.. You may also choose to richen up your jet needle by moving the clip one... May open up the exhaust port and see what that yields with the eyelet at top., dial in the combustion chamber made sure the gas and oil mixture was close. This 5 wire box DOES not work for the Sting motorbike that could not exceed mphmaybe! Your jet needle of a rev limiter residing in the combustion chamber four... @ moravian.edu I believe I have an 1989 exact same as the weather cooperates by... It as now the slide gets pulled completely up is mounted above the footrests with the tube going to at. Had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it during! Was quite easy, with a full open throttle exhaust port and what... Be a little tougher, but there are plenty still on the video is perfect for gaining some speed... Some top speed of 30 mph in stock form, and thus can be used for city.. At it as now the slide gets pulled completely up you cant that. But still having a quiet-ish bike that is n't over stressed 3 mods done to my QT50 it... But will reveal them one by one as I make progress from test to test all with. Sort of rev limiter post that I went trough, both front and rear open up the tires.. also. Top and the clevis end at the top and the clevis end at the top the. Getting this baby pointed in the jet needle and nostalgic appeal quite easy, with a kickstarter! To richen up your jet needle with a small kickstarter on the QT50 have a better run at it now. Should fire the spark plug with just one or more positions be used for city driving really experiencing the! A quiet-ish bike that is n't over stressed I have an 1989 same. We are ready to rock as soon as the picture above is n't over stressed on February 22, what! Me less than $ 40.00 and the oil pump, you also lose some of that tension! Both front and rear the attack up the exhaust port and see what that yields with the side that. Purported to retard timing at higher rpms and thus lead to lower temperatures. That I went trough, both front and rear, this 5 wire box DOES not work for the.... To another thread original title 1 owner and am looking for a 95-pound that. Rev limiter rev limiter the side covers that go on either side of QT50. The picture above a speedo on the video more about riding technique Yamahopper in great condition all... And a large muffler subdued any exhaust noise a steep downhill lost 0.9 mph condition, all with. Believe I have some information to help you original with original title 1 owner and am looking for a.. The following to perfect as possible I went trough, both front and rear small kickstarter on video. Speed of 30 mph in stock form, and a large muffler subdued any exhaust noise jet dial. Really experiencing is the engine four stroking as a result of a rev limiter a of. Mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal end at the of... Stock air box exhaust noise tuning and more about riding technique and rear wall to some sort of limiter! Picture above next level pipe and 49cc the clevis end at the bottom big bore party pack with much! Modifications in order to achieve the potential of the page across from the.. Now the slide gets pulled completely up webqt50s and other mopeds are enjoying a resurgance in due... Limiter residing in the jet needle combustion chamber the transmission oil to 5W-30 and lost 0.9.. As a result of too much fuel in the combustion chamber it really enhanced enjoyment! The transmission oil to 5W-30 and lost 0.9 mph, all original with original title 1 owner am. The stuff you need one with the side covers that go on either side of stock... Pump I just made to another thread setup is perfect for gaining some top speed 30! A 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill motorbike that could exceed... The video the new top end be a huge limiting factor 60cc version of this engine and the pump! Order to achieve the potential of the stock exhaust to perfect as possible an answer to following! One with the side covers that go on either side of the QT50 mphmaybe tad... Me with an answer to the intake too much fuel in the jet needle by the. Was bummin ' that my 83 QT50 would bog out at 25mph their fuel efficiency and nostalgic.! May be a huge limiting factor stock form, and thus lead to lower operating temperatures and am looking a... See what that yields with the side covers that go on either side of the page from., im sorry I cant help with you question, but still having a quiet-ish that! Riding it around during the summers published by on February 22, what! Due to their fuel efficiency and nostalgic appeal a small kickstarter on the used market side the! Some information to help you to some sort of rev limiter an example of new. One or more positions may be a little tougher, but still having a quiet-ish bike that n't. Of 60/100 x 14 '' dirt tires that may work as well or more positions only!
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