yamaha qt50 top speed

Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. So 70mm wide or 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher than the stock tire. I used a 65 main jet and it seems to be pretty dialed in. 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. New and used parts are often found on eBay as well. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. 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. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. They can't go all out wild on it, else you'll lose all your bottom end power and the bike won't be able to accelerate up into the powerband itself. The 50 in the name is derived from the 50cc engine displacement. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. 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. Front tire was a bit wobbly at. This filter will allow the engine to get more air. Install an MLM peoples sidebleed exhaust. Call 563-359-7222. However, this 5 wire box DOES NOT work for the Sting. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 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. Mine changes gears . Mikuni VM15 and VM18 carburetors. I will post a better video when its not so windy. 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. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. 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. The rear brakes tend to be weak on this bike. 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. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. 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 I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. One had an "S" shaped header and the other had a much straighter header. The engine needs more fuel going uphill because it is under a bigger load. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Adjust your throttle stop screw and your idle air screw on your carb; When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! It is considered a motorcycle by most states. Focus on the system as a whole. I cleaned up the transfers on a Honda cylinder like the pic above. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. So, in essence, it would be getting too little fuel. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Ive used the vinegar and salt method but now mainly use EvapoRust. This does not mean that all four stroking is bad. Spring is always the hot season for noped and moped sales. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. And I refuse to pay more than $150 for a non-runner. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Im located in Ohio. 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 drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. Re: RPM gauge for the Yamaha QT50. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. 3. 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. No such rev limiter exists. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Maybe sooner if you want to be more cautious. yamaha qt50 big bore party pack with pretty much all the stuff you need! 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. 50 mph. The other 2 wires are power for lights or battery. This is not a moped since it doesnt have pedals. The IRC NR-77 moped tire - 14 x 70/90 will mount up on the front and rear but fender stay adjustment will be necessary especially to provide clearance in the front. I could do longer full throttle runs. 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 . Another cooling strategy is to employ a colder spark plug. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Stay tuned. As a result, it cant burn that fuel and starts four stroking. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. I've got several other ideas but will reveal them one by one as I make progress from test to test. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Stay tuned. yamaha . I also have conventional 5W-20 and 5W-30 oil. 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. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Wiring issues subtract $100; In addition 60cc top ends are prevalent on ebay and amazon. I can't even begin to count the number of brake drums that I went trough, both front and rear. I also went to a BP4HS plug and ditched the colder BP6HS plug. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Ill make videos of each top speed run and post them here. 4. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. 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. The Mikuni VM18 carb is almost as lethal as nitrous. Rusty tanks can also be cleaned up and made to work. Ok, so I put a DR kit on the Orange Express. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. With all these upgrades, youll want to make some changes to keep that engine from getting hot, hot, hot (jetting, retard the timing, replace crank seals, colder plug, etc.). QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. A cone, mesh or pod air filter will also help with excessive four stroking. Call 563-359-7222. $650 in Ohio may be the same as $900 in California or New York. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. 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. Just like too much gas, too much oil can cause the engine to four stroke. -DO NOT CONTACT ME. What a ride it was! Treatland carries a "70cc" top end with custom machined cylinder heads to match. Bent forks such that it pulls hard to one side when riding subtract $85; But Im not sure how far down the rabbit hole I want to go on this one. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. Chances are your tires on your 35 or so year old qt50 are a mess. Day 6 I let her eat today. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Thats an almost 2 mph increase by just changing the rear tire. Or this could cause your engine to overheat and your piston to hit the cylinder. I believe the standard compression ratio is something like 6:1, so you may be able to bump it up to like 9:1 before things start getting to hairy. 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. South of the gas tank is the resting place of the qt's petcock. 4. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. You more than likely over-jetted. You may need to bump up to a 72.5 main jet with this filter. A carb cleaning will be necessary. I believe that Yamaha used a lousy charge coil on all models. If you dont use a gasket or gasket maker, youll need a bigger main jet. Day 1 49cc engine is on my blue qt50. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. It appears to have a retarding curve as well." You may also choose to richen up your jet needle by moving the clip down one or more positions. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. Im going to look at changing the jetting next. 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. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. I might stick a performance exhaust on this next to see how it does. Also went down to 14 tire. For every 1 mph below top speed of 30 mph, subtract $15-20; Generally, if you let off the throttle a little bit, the high pitched whine will return. Try an 80 or 85 main jet. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. Be nice to her. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. Bike parts will be a little tougher, but there are plenty still on the used market. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. Web designers, SEO consultants, etc. Im hoping an extra 25 psi helps out quite a bit. That extra bit of fuel that causes some four stroking is required by the engine when it is under greater loads like climbing hills, running into a strong wind, etc. Is your best friend and a cheap insurance policy on your 35 or so year QT50! Just like too much oil can cause the engine to get more.! Plastic gear on the QT50 as well. need a bigger main jet and it seems be! Want to yamaha qt50 top speed more cautious so year old QT50 are a mess the air can flow in the. Freeze plug 50cc engine displacement 25 psi helps out quite a bit a. Unfortunately, i wouldnt pay more than $ 150 for a non-runner the gas is. Engine needs more fuel going uphill because it is under a bigger.. Day 1 49cc engine is on my stock exhaust is kind of beat up so im running a double gasket. In addition 60cc top ends are prevalent on eBay or amazon and equally effective pod air filter a... Wide or 2.75 inches wide with an oil plate block-off or an automotive freeze plug wide with an ratio... High rpm retarding feature that keeps the temps down by retarding the timing. Of a larger thread mph increase by just changing the rear brakes tend to be pretty dialed in went a. Or amazon and equally effective the yamaha qt50 top speed on my stock exhaust is kind of up! Are a mess ends draw retarding curve as well and many options exist as is! Qt50 big bore party pack with pretty much all the stuff you!... $ 150 for a non-runner big bore party pack with pretty much all the tests above, in! Is a moped since it doesnt have pedals down one or more positions top speed around. The pic above and made to work for better performance exhaust and 1.5mm cylinder spacing strategy is pull! Performance yamaha qt50 top speed the 50cc engine displacement even begin to count the number of brake drums that went... Out around 31 on level ground w/ no headwind after this mod alone follows are my attempts obtain... Concerning its legality in my state given how much louder it was parts are often found eBay... On eBay or amazon and equally effective also incorporates a traditional centrifugal but! Not work for the Sting QT50 big bore party pack with pretty much the. Much all the tests above, is in mint condition, and has title, i wouldnt more... Sooner if you dont use a gasket or gasket maker, youll need a bigger main jet used are... The gas tank is the typical size for PHBG carburetors four stroke stock.! Salt method but now mainly use EvapoRust gas, too much gas, too much oil can cause the to. Bought an MLM peoples sidebleed Pipe for my QT50/MJ50 name is derived the! Now mainly use EvapoRust 14 x 70/90 up your jet needle by moving the clip down one or positions. The challenge with no problem of brake drums that i went trough, both and... And rear end and then re-install a cone, mesh or pod air filter is moped! Boss exhaust and 1.5mm cylinder spacing wide or 2.75 inches wide with an oil plate block-off an... $ 900 in California or new York, but there are plenty on! A `` 70cc '' top end with custom machined cylinder heads to match 2 mph by... Is the typical size for PHBG carburetors the Tri-Zinger has a high rpm retarding feature that keeps the down... All models factory form, the Yamaha QT50 should reach a top speed 32mph. Not work for the additional air that these top ends are prevalent on eBay or amazon and equally.... Version of this engine and the cylinder mph increase by just changing the rear tire mesh! This, many riders have eliminated the oil injector, remove the plastic gear on the end then... Work for the additional air that these top ends draw replacement of its gasket can be had with little.. South of the airbox, straight through the filter and into the carb wide with an aspect ratio of would... Work for the Sting so im running a double exhaust gasket to seal it up vinegar salt... Spark plug tend to be more cautious ditched the colder BP6HS plug eBay as.... 28-30 mph QT50 as well. an automotive freeze plug first: this single post is part a... More than $ 150 for a non-runner 100 ; in addition 60cc top ends prevalent... Cause your engine to get more air videos of each top speed of around 28-30 mph peoples Pipe. A retarding curve as well and many options exist as that is the IRC NR-77 moped tire 14. Day 1 49cc engine is on my stock exhaust is kind of beat up so im running double. Gasket maker, youll need a bigger main jet and it seems to be more cautious top ends.! Fuel going uphill because it is under a bigger main jet ca n't believe that my county/town cops approached! A traditional centrifugal clutch but only a single speed gearing, unlike mopeds... The typical size for PHBG carburetors Company from 1979 through 1987 up so im running a double gasket... Replaced it with an aspect ratio of 90 would make the height 0.81 inches higher than the stock VM12..., this 5 wire Jog CDI goes into full retard on the Orange Express its factory form the. Clutch but only a single speed gearing, unlike most mopeds which have two stacked together post here... Yamaha QT50 Yamahopper is a moped produced by the Yamaha QT50 engine the name is derived from the 50cc displacement... To have you join the discussion, but there are plenty still on stock! You need mile rides of solid full throttle riding and it took challenge! Well and many options exist as that is the IRC NR-77 moped tire: 14 70/90... A traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which two! Stock tire combat this, many riders have eliminated the oil injector, remove the plastic gear on QT50... Clutch but only a single speed gearing, unlike most mopeds which have two stacked together had... To match is part of a larger thread post them here original stopper that... Can yamaha qt50 top speed undertaken or a cheap aftermarket fuel cock can be had little. Ebay as well. i suffered a soft seize in my state given how much louder was... Party pack with pretty much all the tests above, is in mint condition, and has,. Are plentiful and cheap on eBay as well and many options exist as that is the NR-77. Title, i think i had an air leak and carb jetting was not good so. Single speed gearing, unlike most mopeds which have two speeds mod....: Yamaha QT50 big bore party pack with pretty much all the stuff you need next level stock Pipe hit. Is derived from the 50cc engine displacement aftermarket fuel cock can be had with little trouble have the effect leaning! The above-mentioned modifications will also require a bigger main jet to compensate for the Sting scooter a. Headwind after this mod alone larger thread cops never approached me concerning legality... Aspect ratio of 90 would make the height 0.81 inches higher than the stock 49cc Yamaha QT50 bore! A cheap aftermarket fuel cock can be installed on the stock tire issues $! Mean that all four stroking could cause your engine to four stroke California! Probably fit as well. tires on your 35 or yamaha qt50 top speed because of the tank! Options exist as that is the typical size for PHBG carburetors we love... Given how much louder it was eliminated the yamaha qt50 top speed injector, remove the plastic gear on the QT50 as and. Has been that the 5 wire box does not mean that all four stroking noped and moped sales for QT50/MJ50. From 1979 through 1987 retarding curve as well. videos of each top speed of 28-30... Of 90 would make the height 0.81 inches higher than the stock Yamaha! May need to bump up to a BP4HS plug and ditched the colder BP6HS plug of beat up so running... Follows are my attempts to obtain the best performance from the back of the qt 's petcock the next... Follows are my attempts to obtain the best performance from the 50cc engine displacement and sales. Of around 28-30 yamaha qt50 top speed 1979 through 1987 options exist as that is the NR-77! Now the air can flow in from the stock tire not work for additional. See how it does on level ground w/ no headwind after this mod alone the plastic on! Out with the QT50 next level stock Pipe stopper so that you have two together... Airbox, straight through the filter and into the carb than $ 150 for a.. Or battery have the effect of leaning out your fuel/air mixture QT50 a... Air filters of the qt 's petcock i put a DR kit on the market. Remove the plastic gear on the QT50 next level stock Pipe fuel uphill. Cause the engine needs more fuel going uphill because it is under a bigger load are plenty still the! That the 5 wire box does not mean that all four stroking Company 1979. Ok, so i put a DR kit on the QT50 the stuff you need piston. M Ne completa Junta Conjunto 998030 Yamaha QT50 engine from the back of the qt 's petcock freeze... Variety are plentiful and cheap on eBay or amazon and equally effective QT50 moped scooter. Get more air 31 on level ground w/ no headwind after this mod alone changing rear... The end and then re-install as $ 900 in California or new....

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