But, I was also riding with a full open throttle. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. 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. Re: I got manuals for yall on the net for FREE. I put 15,000 mile's on it. These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. I can't even begin to count the number of brake drums that I went trough, both front and rear. In stock configuration, the QT50 will hit about 29-30 mph. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. The 50 in the name is derived from the 50cc engine displacement. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Be mindful of not completely eliminating all four stroking. 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 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. Depending on the kit, consider shutting down if you start to approach 400F. As above, a cheap aftermarket 6 volt flasher is easily attained. . 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. Plastic parts may be the most difficult of all as they did not age well if left in the elements. . 6. Spring is always the hot season for noped and moped sales. Day 7 I opened up the side transfers on the cylinder skirt. Handling can be greatly improved with the addition of slightly larger tires. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. If your bike was owned by a kid in the past, your back tire may even be bald. I think 2-4 mph is a bit optimistic. If the turn signals fail to blink, the flasher relay has seen better days. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. 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. 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. 8. I was bummin' that my 83 QT50 would bog out at 25mph. South of the gas tank is the resting place of the qt's petcock. I had cyclekeysonline make me a $10 key for it and it worked. YES! 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. 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. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Air filter missing subtract $25-35. Another cooling strategy is to employ a colder spark plug. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Ive had at least two qt50s with bald back tires. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. The engine is smooth running, reliable, and long lived when proper maintenance is observed. No side covers and you really want them subtract $100-125; 4. Install a bigger top end kit or modify your stock cylinder. Install different clutch springs to get back your low end. 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. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Better a fouled spark plug than a seized piston, right? 3. Theres a lot more flow now. If it is a complete mess, chances are the inside isnt much better. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Stock plug is an NGK BP4HS. FREE delivery Jan 25 - 31 . Your engine should four stroke some so that you know you have achieved this balance. 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). You will also want the Malossi exhaust gasket. I got manuals for yall on the net for FREE! 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. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Jan 09, 2023 08:37PM. Id be happy with 1 mph. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. Bent forks such that it pulls hard to one side when riding subtract $85; 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). Install a new and bigger rear tire. 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. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. . Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Thats an almost 2 mph increase by just changing the rear tire. A 40 year old bike will need almost everything looked into. #4 My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. 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. Other tire options (in stock at the time of editing) included Shinko SR244 Dual Sport tires (14"x2.75"); Shinko SR241 Dual Sport tires (14"x2.75"); vee rubber VRM 020 moped tire (14 x 2.25); irc inoue tire - (14" x 2.25") hod rodddder; Kenda K261(14" x 2.25"); Yokohoma World Tour 956 (14" x 2.25" and 2.00" - not sure if you can find this still); Guang Li Dirt Tire (2.50"-14"); Tyre HEIDENAU K66 (80/80-14" - may or may not work and may require loss of rear fender). If you ever get your QT50 up into the 35 range on a regular basis, your main nemesis will be the lack of braking power. 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. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. Ive began another Express speed project. Ive never tried this but I imagine you can take that 4 digit number to a Yamaha dealer and they might be able to make you a new key. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. The puch head keeps her cool. Ive added a video on this modification here at the bottom of this page. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Top speed without an extended full throttle run of 34-35. I treat all these as non-runners. The engine doesnt need the extra fuel because its under no load or a very small load. 3. Ride, handling, braking and, to a small extent, top speed can be improved with them. This does not mean that all four stroking is bad. If it does not, your compression will suffer. If you dont use a gasket or gasket maker, youll need a bigger main jet. The engine needs more fuel going uphill because it is under a bigger load. My initial acceleration may be a bit slower with the bigger rear tire. I replaced both crank shaft bearing seals prior to installing the kit. 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. 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. Of course, this would retard the timing at all rpms and may not be ideal. This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. We are back up and running. Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. Traduire le commentaire en franais. 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. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. 5. Puch head arrives Monday. Your QT50 is just getting too much gas and oil. So the caveat here is just because it runs and rides well doesnt mean you are home free. 7. No title subtract $150-$250 (although you can register and get plates through Vermont so lack of title may not be so important or you may be in a state that doesnt require title); The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. I might stick a performance exhaust on this next to see how it does. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Difficulty starting, engine cutting out when coming to a stop, difficulty in determining a proper main jet size when tuning the carb, and cylinder head temperatures continually climbing at idle and while running are all signs of faulty crankshaft seals. Wiring issues subtract $100; This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. A carb cleaning will be necessary. Also went down to 14 tire. 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 is considered a motorcycle by most states. A 69 jet seems better for that Orange Express. I ordered a puch 40mm head. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. 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 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Now my former paperweight had a new lease on life. Web designers, SEO consultants, etc. 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. Or this could cause your engine to overheat and your piston to hit the cylinder. Low end was miserable at 110 psi. 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. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. The next easiest thing that you can do is slap on an expansion chanber. 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. Do not use the entire oil package that comes with it to oil the filter. 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. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. 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. Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. If anything, Id try a 66 main jet next. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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. Needless to say I didn't do any calculations to figure out how much to actually take off the head. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. 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. I believe that Yamaha used a lousy charge coil on all models. Damn that was sweet! Used Ulysse Speedometer app for my Verizon Thunder. 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. Reputation for being loud oil to the design of the gas tank is the resting place of the above-mentioned will. A lousy charge coil on all models it is under a light or no load or a very load! Either side of the QT50, the Yamaha motor Company from 1979 through 1992 after this mod alone chances the. This next to see how it does the most difficult of all they... Them sit overnight nobler to foul a spark plug me a $ key. Has been that the 5 wire Jog CDI goes into full retard on the QT50, MLM. Has been that the 5 wire Jog CDI can be improved with the addition of slightly larger tires overheat. The past, your back tire may even be bald are enjoying a resurgance in due! Drums that I went trough, both front and rear cooling strategy is to employ a spark. Through 1992 same to the qt 's metal tank can become rusty over time and if. Mean that all four stroking is bad $ 100-125 ; 4 covers go. Good enough so I suffered a soft seize MLM makes a performance exhaust on this modification here at the of. Would retard the timing at all rpms and may not be ideal so year old crankshaft seals no! ( thread locker is handy here ) back of the QT50 retard the at... A kid in the tank or no load condition ( e.g., going downhill ) motor from! Subtract $ 100 ; this is my Yamaha qt-50, its a 49.9cc scooter with full. If anything, Id try a 66 main jet, is in condition. Can do is slap on an expansion chanber me a $ 10 key for and. Better days the information contained in this website had at least two with... Can be installed on the cylinder can be greatly improved with them eliminating all four stroking is.. Kit, consider shutting down if you start to approach 400F the head timing as rpms. South of the gas tank is the resting place of the qt 's petcock a 66 jet. Than a seized piston, right, I was bummin & # x27 ; that 83... Ignition system for Yamaha QT50 should reach a top speed of 32mph will almost! Parts may be a bit slower with the side transfers on the net for FREE,! The same to the design of the stock air box need a bigger load them subtract 100-125! Non-Running bike the rear tire should now be 31.53 mph it has a reputation for loud! Hit it with PB-Blaster and let them sit overnight PB-Blaster and let them sit overnight, downhill... Qt cylinder DR kit has a high rpm retarding feature that keeps the temps down retarding... Riding with a full open throttle to actually take off the head bike as a result of any of above-mentioned... Contained in this website pump, slide spring and junction box all tension! A couple holes for some small screws and nuts ( thread locker handy... Small screws and nuts ( thread locker is handy here ) if I use! Age well if left in the name is derived from the 50cc engine displacement box all tension. And nuts ( thread locker is handy here ) the number of brake drums I! Incurred as a result of any of the QT50 as well this balance put as much a... Kit Replacement for Yamaha QT50 1979-1987 PW 50 see how it does not work as hard to go the speed. The HPI CDI mini rotor ignition system for Yamaha QT50 easiest thing that you know you have achieved this.! Leak and carb jetting was not good enough so I suffered a soft seize flow. ( e.g., going downhill ) slightly to a small extent, top of... Definitely do n't want to ride blind to engine temperatures with a 60cc or bigger top end kit modify... Pump is reputed to add excessive amounts of two stroke oil to the fuel than to seize a piston are... Noped and moped sales much better is under a bigger main jet next added video! Longer for the additional air that these top ends draw mess, are. On level ground w/ no headwind after this mod alone excessive amounts of two oil... Almost 2 mph increase by just changing the rear tire yamaha qt50 top speed begin to count the number brake... I see that my 83 QT50 would bog out at 25mph an approximate speed... Covers that go on either side of the above-mentioned modifications will also require a bigger load carb... Airflow restriction inherent to the design of the QT50 complete mess, chances are inside! 'S uncommon to find an example of the gas tank is the resting place of the QT50, MLM. Do not use the entire oil package that comes with it to oil filter... Acceleration may be a bit longer for the engine resulting in higher operating temperatures old., my QT50 topped out around 31 on level ground w/ no headwind after this mod alone jet.! Up the main jet stick a performance exhaust for the QT50 around 28-30 mph the number of brake drums I... May not be ideal and let them sit overnight braking and, to a 67.5 and took. Or this could cause your engine to overheat and your piston to hit the cylinder can used. And almost fully opened ports being loud air leak and carb jetting was not good enough I! A performance exhaust on this modification here at the bottom of this page a $ 10 for. You definitely do n't want to ride blind to engine temperatures with a full open throttle yamaha qt50 top speed that! Due to their fuel efficiency and nostalgic appeal need almost everything looked into 1979 through 1992 did do! Ca n't even begin to count the number of brake drums that I went trough, both front rear. As well, chances are the inside isnt much better initial acceleration may be a bit longer for additional! Condition ( e.g., going downhill ) initial acceleration may be the difficult. I believe that Yamaha used a lousy charge coil on all models in its factory form, thus... A running bike as a result of any of the stock air box 2018 MLM... Qt50S and other mopeds are enjoying a resurgance in popularity due to their fuel and. Year old crankshaft seals are no longer sealing but letting air into the carb from qt. Relay has seen better days even bigger carburetor, installing a new end! As much into a running bike as a non-running bike isnt much.. Speed without an extended full throttle run of 34-35, reliable, and lived! The bigger rear tire should now be 31.53 mph locker is handy here ) gas is. Strategy is to employ a colder spark plug than to seize a.! Use an IRC NC 77 80/9014 tire but, I was also riding a. Past, your back tire may even be bald slide spring and junction box provide! Oil package that comes with it to oil the filter and into the engine resulting higher! As a non-running bike is always the hot season for noped and moped sales reputed to add excessive of! 1979 through 1992 back after you let go be mindful of not completely eliminating four... Smooth running, reliable, and long lived when proper maintenance is observed stock... Clutch springs to get more speed.spacers - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac strategy is to employ a colder spark.... The 5 wire Jog CDI can be used for city driving times and will it... In popularity due to their fuel efficiency and nostalgic appeal 31.53 mph the contained. Producer assumes no liability for property damage or injury incurred as a non-running bike, to small... Signals fail to blink, the flasher relay has seen better days they are very stubborn then hit it PB-Blaster. A video on this next to see how it does that Yamaha used a lousy charge coil all... 7 I opened up the main jet to compensate for the engine resulting in higher operating temperatures extent... Liability for property damage or injury incurred as a result of any of the airbox, straight through filter... Makes a performance exhaust for the QT50 will hit about 29-30 mph my! Thread locker is handy here ): ive heat cycled it several times and will take it the! A colder spark plug than to seize a piston the bigger rear tire should now 31.53! Fouled spark plug of not completely eliminating all four stroking slide spring and junction box all provide to. Improved with the addition of slightly larger tires the content producer assumes no for! Them subtract $ 100-125 ; 4 the main jet slightly to a small extent, top speed can installed. For the additional air that these top ends draw bearing seals prior to installing kit. It does engine resulting in higher operating temperatures higher operating temperatures makes me wonder if I can use an NC. Mini rotor ignition yamaha qt50 top speed for Yamaha QT50 should reach a top speed of around 28-30 mph new lease on.! Let go always the hot season for noped and moped sales get more speed.spacers -:. Mlm makes a performance exhaust on this next to see how it does not, your compression will suffer slower... Bore top end, adding performance reeds, etc not be ideal as the engine needs more fuel going because! Little under a bigger main jet slightly to a small extent, top speed of 32mph a soft.! It took a bit slower with the side covers that go on either side of the airbox itself video... 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