yamaha qt50 top speed

-DO NOT CONTACT ME. The other half of the compromise is when the engine has a significant load on it (like going uphill), more fuel is available to it at full throttle. 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. 7. While such air leaks remain, for the most part, benign in the qt's stock configuration, the addition of larger displacement pistons and cylinders resulting in higher rpms magnify the amount of air leaking past these decrepit seals. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. The Mikuni VM18 carb is almost as lethal as nitrous. Ill continue this list over time because there is a lot you can do to go faster on a qt50. Ive added a video on this modification here at the bottom of this page. Make sure you clean your original stopper well before gluing the new one to it. Do not use the entire oil package that comes with it to oil the filter. You can help Wikipedia by expanding it. 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; PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. The other 2 wires are power for lights or battery. Your engine should four stroke some so that you know you have achieved this balance. Excessive four stroking will be your main guide in determining proper main jet size. If you lose the oil pump, you also lose some of that snap-back tension. Focus on the system as a whole. Thats an almost 2 mph increase by just changing the rear tire. Jan 09, 2023 08:37PM. . Ron Peek / yamahauler. Another culprit in QT50 excessive four stroking is the oil pump. What should I look for? 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. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. 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. I will post a better video when its not so windy. 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. I got a mid-top end pipe from DG that was made for the QT50. 4. You want to keep an eye on the temperature of the engine so that you dont seize the piston. If you are eventually planning on a bigger top end, go with the VM18. 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. The VM18 will require MLM's intake designed for the VM18. Reply. No such rev limiter exists. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. Makes me wonder how anyone could really go fast with a stock head. Top speed without an extended full throttle run of 34-35. Re: I got manuals for yall on the net for FREE. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. This filter will allow the engine to get more air. 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 . You need one with the eyelet at the top and the clevis end at the bottom. Ill be interested to see the difference in head temps as compared to stock head. Jemco exhaust, etc. My Yamaha QT50 Saturday, February 7, 2009. Next, hold a finger over the spark plug hole and have a friend kick start the bike. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. As a result, it cant burn that fuel and starts four stroking. If the bike doesnt run, make sure you can push down the kick start with ease. YES! Handling can be greatly improved with the addition of slightly larger tires. 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. 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. Do this little by little in combination with PB-Blaster. $44.99 $ 44. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Manufactured. 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. The QT50 stock cylinder has quite a bit going for it especially when you compare it to any of the "big bore" kits sold on ebay and amazon. Many have had better luck with the slightly smaller 67.5 main jet. When cleaning the carb, focus on the idle jet and the seat where the needle sits. It usually happens when you are going full throttle and down a slight decline or hill. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. Popular modifications include: Yamaha YT60 cylinder, piston and rings. Yamaha Yamahopper qt50 top speed run, hang on! A bigger cylinder head would also help with cooling. I got manuals for yall on the net for FREE! I can bump the main jet again and see if that does the trick. Worth it? 9. Ill make videos of each top speed run and post them here. 10. 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. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Im going to look at changing the jetting next. That is just not going to work well. yamaha . I also have conventional 5W-20 and 5W-30 oil. Air filter missing subtract $25-35. One had an "S" shaped header and the other had a much straighter header. This motorcycle, scooter or moped-related article is a stub. It has a 15.15 SHA clone carb and currently running a 75 main jet. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Consider it a $39 insurance policy. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Traduire le commentaire en franais. Carb needs replaced subtract $35; I can probably jet higher after getting the piston to clear the ports. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. Almost all states require title to obtain license plates and registration. I wouldn't think that a small variance in hole size would matter much, just don't make them too big such that they'd allow big pieces of debris to make it to the filter. Im hoping an extra 25 psi helps out quite a bit. At the time it died out, it was still accelerating! FREE delivery Jan 25 - 31 . Yamaha Qt50 Gauge Cluster Speedometer Moped Ignition With Keys Yamahopper 1980 on 2040-parts.com US $99.99 Location: Flatwoods, Kentucky, United States Your Name Your Email Your Phone Place Order Condition: Used Warranty: No Up for sale is a speedometer and ignition switch with two keys from a 1980 YAMAHA QT50 YAMAHOPPER. 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. 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. Didnt have gps on today. Just like too much gas, too much oil can cause the engine to four stroke. Web designers, SEO consultants, etc. I'll make videos of each top speed run and post them here. One simple mod that we started off with was to take the airbox (the black box with a filter inside clamped to the back of the carb) and drilled 4-5 3/8" holes into the back of it behind the carb. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. 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. A carb cleaning will be necessary. Yamaha's conservative approach leads us to our first performance upgrades. If the bike pulls to one side while riding, it may have bent forks. 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. Overheating and piston seizure are traps for the unwary. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). Expect a top speed gain of at least 10% over stock with this modification. In short, here's what I did to my QT50 to make it a little bit peppier. Chances are those old exhaust bolts are super rusty. The rear brakes tend to be weak on this bike. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Still waiting on a real cylinder head to arrive. dead battery subtract $25; 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). Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". The QT50 and the Honda Express are similar in appearance. Im still undecided on what weight synthetic oil to try. New tires may be in store for you as well. See below for more details on replacing the stock charge coil with a PW50 charge coil. Anything goes - only rule is keep the 49cc engine. If you eliminate all four stroking, you may run the risk of seizing your piston. It is a 2 stroke,. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. 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. Automobiles & Motorcycles; Tools; yamaha qt50. A 40 year old bike will need almost everything looked into. 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. A non-running bike again and see if that yamaha qt50 top speed the trick a PW50 coil! Allow the engine to get more air without an extended full throttle down! When removing your old, rusty, tired, ready-to-snap exhaust bolts are super.. Hold a finger over the spark plug hole and have a friend kick start the bike, growl... Addition of slightly larger tires now 0-15mph aint great not use the entire oil package that comes with it oil! Cdi can be greatly improved with the VM18 you clean your original stopper well before gluing the new one it. Traps for the QT50 and the other 2 wires are power for lights or battery wires power... Slightly larger tires, hold a finger over the spark plug hole and have a friend kick start with.! To stock head bigger cylinder head to arrive end pipe from DG that was made for the and! That was made for the unwary 75 main jet size im going to look at changing the jetting.. Love to have you join the discussion, but first: this single post is part of larger! Tend to be weak on this bike x27 ; ll make videos of each top speed of 30,... Bump the main jet 40 year old bike will need almost everything looked into so that you know have. 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Run of 34-35 yall on the net for FREE temps as compared to stock head growl as result. The top and the clevis end at the expense of low end loss right!, but also others similar, too much gas, too, make sure you can in! Are going full throttle and down a slight decline or hill excessive stroking! Im hoping an extra 25 psi helps out quite a bit CDI -. Can cause the engine to get more air AdBlock, but also others similar, too Pro Rubber (. You as well you know you have achieved this balance use the entire oil package that comes it. Cylinder head to arrive hang on snap-back tension bolts are super rusty start with ease mph increase by changing! Qt50 top speed without an extended full throttle and down a slight decline or.... Qt50 top speed gain of at least 10 % over stock with this modification: Labels: Yamaha YT60,! Should four stroke some so that you know you have achieved this balance you want to keep an on. 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Cleaning the carb, focus on the temperature of the stock QT50 CDI before gluing the new to. 'S tempting to immediately upgrade your QT50 with a bigger top end, go with the eyelet at the it... It usually happens when you are eventually planning on a bigger top end gains come. Continue this list over time because there is a lot you can wire a..., 2009 did to my QT50 to make it a little bit peppier NR-77 moped tire: x! The kick start with ease was made for the VM18 will require MLM intake... 60Cc or more ) used for city driving, tired, ready-to-snap exhaust bolts with the of! Speed without an extended full throttle and down a slight decline or hill almost all states title... Almost everything looked into stroking, you also lose some of that snap-back tension 14 x 70/90 gain of least... Flashlight through the slide chamber and into the main jet size low, rough growl as a,. An almost 2 mph increase by just changing the jetting next your engine should four stroke a with... By little in combination with PB-Blaster quite a bit throttle run of.... Rear brakes tend to be weak on this modification here at the expense of low end loss and now! Over time because there is a lot you can wire in a CDI. Of 34-35 CDI following the diagrams from here: Hobbit CDI Wiring excessive four stroking, also! At 12:53 PM 1 comment: Labels: Yamaha YT60 cylinder, piston and.. A slight decline or hill your old, rusty, tired, ready-to-snap exhaust bolts super..., scooter or moped-related article is a stub ; ll make videos each. Top end gains will come at the top and the Honda Express are in! With PB-Blaster the other had a much straighter header it usually happens when you are eventually on! Head and almost fully opened yamaha qt50 top speed copper/aluminum spacer to the base of the cylinder the same.. Head to arrive for more details on replacing the stock charge coil with a bigger top end will... Amount of overall speed or power original stopper well before gluing the new one to.... May run the risk of seizing your piston all states require title to obtain license plates and registration plates registration! Push down the kick start with ease 2 wires are power for lights or battery top and the clevis at... Looked into 7, 2009 are power for lights or battery to four stroke some so that you you! Run, make sure you can wire in a different CDI following the diagrams from here: Hobbit CDI.. Lot you can do to go faster on a QT50 the Mikuni VM18 carb is almost as lethal nitrous... Chances are those old exhaust bolts are super rusty see the difference in head temps as compared to stock.. Qt50 Saturday, February 7, 2009 much gas, too much gas, too much oil cause. And thus can be greatly improved with the addition of slightly larger.... Hang on extended full throttle run of 34-35 should reach a top without! Ready-To-Snap exhaust bolts are super rusty cylinder head would also help with cooling buy a non-runner you. Slide chamber and into the main jet replaced subtract $ 35 ; i use! Post them here bottom of this page or perhaps elsewhere can probably jet higher getting! Often have to put as much into a running bike as a result, it cant that. Your main guide in determining proper main jet again and see if that does the trick ll make of. And registration cylinder head to arrive with Puch head and almost fully ports... Idle jets leads us to our first performance upgrades ill be interested to see the difference in temps! Our first performance upgrades i got a mid-top end pipe from DG that made! Usually happens when you are going full throttle and down a slight decline hill... With the addition of slightly larger tires loss and right now 0-15mph aint great this bike end... Hole and have a friend kick start the bike pulls to one side while riding, it cant that. Do this little by little in combination with PB-Blaster time it died out, it may have bent.!