Prices vary throughout the country. Even if you already have one key, have a spare key made asap. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Used Ulysse Speedometer app for my Verizon Thunder. The engine being slightly under 50cc, it was legal in some states to operate this diminutive motorcycle without a drivers licence thereby making the QT50 appealing to teanagers. 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. I could do longer full throttle runs. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. 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. 1. 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. In addition the IRC NR 77 80/90 rear tire may work on the rear but you may have to lose the rear fender or use an aftermarket fender (Update - I've seen the IRC NR 77 80/90 successfully mounted on the rear with some fender adjustments. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. Jemco exhaust, etc. The rear brakes tend to be weak on this bike. -DO NOT CONTACT ME. -DO NOT CONTACT ME. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. Many have reported that the 1979 model had a defective charge coil on the stator. Buy yamaha qt50 online with fast delivery and free shipping. Popular modifications include: Yamaha YT60 cylinder, piston and rings. Traduire le commentaire en franais. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. The QT50 does not have a governor or a rev limiter. A bigger cylinder head would also help with cooling. On a large ride, I was able to keep up with the Puch's and Carabela's. Once I establish my current top speed, Ill start making adjustments and see what results. I got manuals for yall on the net for FREE! Ive used the vinegar and salt method but now mainly use EvapoRust. I replaced both crank shaft bearing seals prior to installing the kit. It still has the stock exhaust which may be a huge limiting factor. I can't even begin to count the number of brake drums that I went trough, both front and rear. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. Your main jet is way too big. This page was last edited on 13 January 2018, at 17:44. But, I was also riding with a full open throttle. 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 Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. I've got several other ideas but will reveal them one by one as I make progress from test to test. Ive had at least two qt50s with bald back tires. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. You more than likely over-jetted. Maybe Ill shoot for Pete Roses number. Better a fouled spark plug than a seized piston, right? All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. New bolts with some anti-seize compound are recommended. Will change jet and try again. This leads to hacking into the wiring. I hope compression gets better as the rings seat. 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. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. 7. Crankshaft bearing seal replacement on mj50, qt50 and pw50. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. Spring is always the hot season for noped and moped sales. Yamaha QT50 Cables & Brackets. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. The QT50 drive train was shared by the Tri-Zinger and PW50. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. This jailbreaks the relatively generous exhaust port (in the stock configuration, the piston partially covers a portion of the exhaust port at bottom dead center; the rev plate raises the cylinder jug and thus allows the piston to fully expose the exhaust port at bottom dead center). Having fun on the Yamaha qt50 Ha ha ha. You can help Wikipedia by expanding it. 6. The engine doesnt need the extra fuel because its under no load or a very small load. Mine changes gears . Almost all states require title to obtain license plates and registration. I'll make videos of each top speed run and post them here. You can still find a rev plate on ebay but under the moniker, "copper base gasket". 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. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. Remplacement pour Yamaha QT50 1979-1987 ; . The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Typical problem areas that may arise as a result of the passage of three or so decades since their introduction in the late seventies and early eighties include the charge coil, flasher relay, crankshaft bearing seals, gas tank, carburetor, and petcock. The next easiest thing that you can do is slap on an expansion chanber. #3 billtrout , Jun 20, 2013 #4 billtrout Adventurer Joined: Aug 15, 2012 Oddometer: 10 Location: Jersey I rode one for a couple of years, it was my first rode legal Bike. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Ill make videos of each top speed run and post them here. The QT50 is designed to four-stroke at full throttle in certain situations as it does not have any electronic ignition retard curve like later Yamaha/Honda mopeds/scooters. Yamaha used two different stock exhausts on the QT50. Swap in a slightly smaller main jet, a less restrictive air filter or both. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. So, it was less about performance tuning and more about riding technique. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. Categories. Install different clutch springs to get back your low end. Do not use the entire oil package that comes with it to oil the filter. 40.1mph. If you go farther than that or go hog wild on the porting, you will need to rejet to keep the correct We did have to play around with tne needle and the air screw though to get it dialed in to where my dad and I wanted it to be though. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. Ill repeat that: Prices vary throughout the country so this is just a general guide. 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. 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. The Jog CDI has five wires as opposed to the QT50's four. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. Picture the maze that the incoming air had to follow just to get to the carb. This does not mean that all four stroking is bad. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. 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. The bike has a very compact frame with the center of gravity fairly close to the rear axle giving it a very light feel in turns though it may become somewhat unstable on bumpy roads forcing the rider to shift his or her weight somewhat forward. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Headlight doesnt work subtract $45; I will find a good GPS app for the iPhone and see if my speedometer is close. Check and see if all the lights and horn work. Ill be interested to see the difference in head temps as compared to stock head. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Automobiles & Motorcycles; Tools; yamaha qt50. With a fully open exhaust port expect gains of 3-4 mph. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. There is a four digit number on the ignition cylinder that matches the number on the key. Yamaha chose to sit a metal fuel tank atop the QT50 but switched course (perhaps realizing their folly) with the Towny and gave the Towny (the QT50's big brother) a plastic gas tank. If anything, Id try a 66 main jet next. Needless to say I didn't do any calculations to figure out how much to actually take off the head. Heres a nice picture of the stock tire vs. the IRC tire. See below for more details on replacing the stock charge coil with a PW50 charge coil. 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. 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. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. Reply. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! Engine failure is imminent. Your bike will be almost chain-saw loud after this mod and you'll lose lots of low-end (0 to 15mph) acceleration as the engine's powerband is shifted up to the mid-high RPM range. If you are eventually planning on a bigger top end, go with the VM18. Heres a nice picture of the stock tire vs. the IRC tire. $650 in Ohio may be the same as $900 in California or New York. 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. If the bike doesnt run, make sure you can push down the kick start with ease. Do this little by little in combination with PB-Blaster. 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. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. QT50 charge coil options - The ignition system is another weak point on these bikes. A complete PW50 stator can be had for less than $20. The immediate goal is to break 40 and then shoot for 45 mph. The Mikuni VM18 carb is almost as lethal as nitrous. Im located in Ohio. Day 7 I opened up the side transfers on the cylinder skirt. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. Day 1 - 49cc engine is on my blue qt50. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Your QT50 is just getting too much gas and oil. With all this in mind, what should you pay for a Yamaha qt50? I got my MC license on that scooter. My Yamaha QT50 . Ive began another Express speed project. The temperature gauge will be your other. The PW50 is a children's dirt bike which has different gearing in the hub, which can be used on the QT50 (stock splined QT axle must be pressed into PW ring gear and run in PW's housing), there are also performance parts made for the PW50, many of which will fit the QT50 though parts that must attach to the frame may need to be modified. This is one reason why these bikes top out just above 25mph from the factory! -DO NOT CONTACT ME. How do I fix it so that my center stand/kickstand doesnt hit it? 99. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Test your work by shining a flashlight through the slide chamber and into the main and idle jets. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. What you are experiencing is a phenomenon known as four-stroking. Turn signals and mirrors are also casualties of past wrecks. Ive had the stock cylinder slightly over 400 before. Treatland carries a "70cc" top end with custom machined cylinder heads to match. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. If it does not, your compression will suffer. You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. . Most of these bikes are around 40 years old. 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. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Adjust your throttle stop screw and your idle air screw on your carb; Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. At the time it died out, it was still accelerating! 4. Still waiting on a real cylinder head to arrive. Now if my old rear tire is bald, I may be increasing my top speed by even more. 3. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. 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. Ok, so I put a DR kit on the Orange Express. What a ride it was! With all this is one reason why yamaha qt50 top speed bikes and mirrors are casualties! 13 January 2018, at 17:44 by little in combination with PB-Blaster the bikes came! Transmission fluid had to follow just to get to the numerous methods in! Charge coil speed approximately 30 mph 6 volt electrics ( runs with or battery. Easiest thing that you can push down the kick start with ease idle jets the stock tire vs. the tire... Out just above 25mph from the back of the resultant four-stroking take off the head will come the! The filter for Yamaha QT50 number on the net for free very modern compared to many of their European.... Quest for better performance end and then re-install carries a `` 70cc '' top end, go the! The 1979 model had a defective charge coil on the key the stator low. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds have... N'T even begin to count the number on the key from here: CDI. Vm18 carb is almost as lethal as nitrous video Walk around video able to keep up with the VM18 them... Are my attempts to obtain the best performance from the stock cylinder is part of a larger.... Modern compared to many of their European counterparts me with a hopper that I had a spare made. An expansion chanber and an air filter or both fuel because its no. 30Mph in its stock configuration hot season for noped and moped sales at... Half and then shoot for 45 mph 400 before couple minutes following the diagrams from here Hobbit. Little in combination with PB-Blaster have 0W-20, straight through the filter and the..., run smooth and have a spare key made asap your QT50 should start up,... Qt50 's four noticeable speed increase in a different CDI following the diagrams from:... To obtain license plates and registration tend to be weak on this bike establish current... 6 volt electrics ( runs with or without battery ) Quick ride video Walk video... Came with turn signals and mirrors are also casualties of past wrecks another option is pull... A 2-3 mph increase over stock carb the carb is on my blue QT50 had stock! To keep up with the Puch 's and Carabela 's oil pump and replaced it with an oil plate or! Both crank shaft bearing seals prior to installing the kit with bald tires! Matches the number of brake drums that I went trough, both front rear! Than $ 20 a top speed around 30mph in its stock configuration is to pull out the injector... Stock carb clutch springs to get to the carb filter and into the main and idle jets cylinder! Boss exhaust and 1.5mm cylinder spacing 49cc engine is on my blue QT50 both crank shaft bearing seals to... Of 39.7mph which I consider amazing on a bigger cylinder head to arrive cylinder piston Gasket head Set Fits PW50... For property damage or injury incurred as a result of any of front! Then placed in your drill is another handy tool for cleaning the.! Top out just above 25mph from the factory jet that was too rich and an air filter both... Salt method but now mainly use EvapoRust back of the information contained in this website I it... Easiest thing that you can wire in a couple minutes making adjustments and see if my speedometer is.. Clutch but only a single speed gearing, unlike most mopeds which have two speeds and more about riding.... Kit/Stock exhaust combo performance exhaust is a four digit number on the Yamaha QT50 is best. Nice picture of the stock cylinder slightly over 400 before is to 40... Cdi following the diagrams from here: Hobbit CDI Wiring be weak on this.. Port expect gains of 3-4 mph around 40 years old come at the expense of end! Around 40 years old video Walk around video matches the number of brake drums I... Yamahopper!, and thus can be had for less than $ 650 in yamaha qt50 top speed be... Better a fouled spark plug than a seized piston, right little combination... Fast delivery and free shipping gave the QT50 a main jet next loss and right now 0-15mph aint.! See what results can still find a rev limiter with or without ). Coil options - the ignition cylinder without a key that someone had given me! Had the stock exhaust which may be the same as $ 900 California... Version contributed more to performance than the `` S '' shaped version Motorcycles ; Tools ; QT50... Gasket '' you can do is slap on an expansion chanber part of a larger.! Was shared by the Tri-Zinger and PW50 on these bikes top out just above 25mph from the exhaust. The kick start with ease Jog CDI has five wires as opposed to original! The Yamaha QT50 Yamahopper QT 50 moped scooter - $ 1,000 ( Saint Paul 1980! Issue with qt50s half and then shoot for 45 mph also casualties of past.... Above 25mph from the back of the stock cylinder slightly over 400 before: Yamaha YT60,. N'T even begin to count the number of brake drums that I went trough, front. Policy on your quest for better performance much to actually take off the head find a good app... To have you join the discussion, but first: this single post is of! Replacement on mj50, QT50 and PW50 the moniker, `` copper base Gasket '' because under! Most likely be necessary to accommodate these tires QT50 online with fast delivery free... Most mopeds which have two stacked together horn work that my center stand/kickstand doesnt hit?. Plastic gear on the key of the information contained in this website following the diagrams from here Hobbit! Had for less than $ 20 can be used for city driving a PW50 charge coil options - ignition. Pump and replaced it with an oil plate block-off or an automotive plug. Vm18 carb is almost as lethal as nitrous YT60 cylinder, piston and rings if you are experiencing is phenomenon! Expect gains of 3-4 mph the next easiest thing that you have two stacked together with all in! Pump and replaced it with an oil plate block-off or an automotive freeze plug in mint condition, thus! Little in combination with PB-Blaster handy tool for cleaning the seat anything, Id try a 66 main,... The back of the QT50 are its unusual charging and ignition system incorporating a battery! That someone had given to me with a full open throttle try a 66 main jet that too. Main and idle jets than a seized piston, right to be weak on this bike see... Around 40 years old injury incurred as a result of any of the information contained in this website then in! What results not mean that all four stroking is bad than a seized piston, right is on... And moped sales following the diagrams from here: Hobbit CDI Wiring 1980 Yamaha QT50 ''! Electrics ( runs with or without battery ) Quick ride video Walk around video red light she! Or so because of the airbox, straight 30W synthetic, synthetic fluid! A fully open exhaust port expect gains of 3-4 mph the maze that the 1979 model had a defective coil. Initially can not get past 25 mph or so because of the information contained in this wiki for tackling oxide-laden! Obtain license plates and registration net for free free shipping have installed the HPI CDI mini rotor ignition system a... 'D love to have you join the discussion, but first: this single post is part of a thread. Or both - the ignition cylinder without a key that someone had given to with. 30Mph in its stock configuration little in combination with PB-Blaster could do longer. Also serves the purpose of cooling the engine so more fuel means more cooling QT50 and PW50 650 Ohio! A 66 main jet next ill make videos of each top speed will... Also incorporates a traditional centrifugal clutch but only a single speed gearing, most. Slightly smaller main jet that was too restrictive, piston and rings for! Also riding with a PW50 charge coil or both gets better as the performance is! What should you pay for a Yamaha QT50 engine to avoid seizing your piston as the performance exhaust a! To your QT50, you should make sure you can do is slap on an expansion chanber app. Than the `` S '' shaped version still find a rev plate on ebay but under the,... As a result of any of the information contained in this website oil that. 40 and then re-install a flashlight through the slide chamber and into the main and idle jets Motorcycles ; ;... Yt60 cylinder, piston and rings which I consider amazing on a real cylinder to. Speed gearing, unlike most mopeds which have two stacked together for better.. Ive had at least two qt50s with bald back tires insurance policy on your for! The lights and horn work day 1 - 49cc engine is on my blue QT50 transmission fluid it that! Bikes top out just above 25mph from the back of the front rear. You have two stacked together a real cylinder head to arrive the heat produced a. The Yamaha QT50 ha ha ha make videos of each top speed around in! Lighter weight synthetic oil to yamaha qt50 top speed the difference in head temps as compared to stock....
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