yamaha qt50 top speed

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. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC 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. So, in essence, it would be getting too little fuel. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. 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. 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). FREE delivery Jan 25 - 31 . 2. 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. Needs both tires subtract $95-105; pwonly.com offers up a 50cc top end with a decked cylinder and a 4mm rev plate if you choose not to do the work yourself. However, the 4 pin Jog/Zuma CDI box from a late 80's-early 90's vertical cylinder model works on the Sting, and is plug and play. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. The engine is smooth running, reliable, and long lived when proper maintenance is observed. But Im not sure how far down the rabbit hole I want to go on this one. Having fun on the Yamaha qt50 AboutPressCopyrightContact. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. Just like too much gas, too much oil can cause the engine to four stroke. This is one reason why these bikes top out just above 25mph from the factory! It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). As with any engine modification like this, you will need to install a larger main jet in the carburetor. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Install different clutch springs to get back your low end. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. 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. The immediate goal is to break 40 and then shoot for 45 mph. What should you pay for (or sell) a Honda Express? Shine the light into the gas tank and determine how rusty the inside of the tank is. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. Jemco exhaust, etc. If these seals are bad then they will allow more air to enter the engine. Reply. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Now my former paperweight had a new lease on life. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). 5. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. 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. Installing a temperature gauge is always a great idea when you perform modifications like this. But, I was also riding with a full open throttle. Mine changes gears . Needless to say I didn't do any calculations to figure out how much to actually take off the head. 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. You can gain a little acceleration back by installing stiffer clutch springs. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Do not use the entire oil package that comes with it to oil the filter. The engine needs more fuel going uphill because it is under a bigger load. I ordered a puch 40mm head. Again, a performance exhaust will call for a larger main jet in the carburetor. New bolts with some anti-seize compound are recommended. 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. Ill make videos of each top speed run and post them here. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. 10. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. 2 stroke engines are designed to four stroke in certain situations. The QT50 has a sealed beam headlight. . I think 2-4 mph is a bit optimistic. The temperature gauge will be your other. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. This cut down on the brake bill dramatically. I put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. What should you pay for (or sell) a Honda Express? 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. 3.8 out of 5 stars 64. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. In stock configuration, the QT50 will hit about 29-30 mph. Dont try that with those niche kits. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. Id be happy with 1 mph. One had an "S" shaped header and the other had a much straighter header. Youd seize before you got to 40. Heres a nice picture of the stock tire vs. the IRC tire. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. If it goes slower than this, negotiate accordingly. This motorcycle, scooter or moped-related article is a stub. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. I hope compression gets better as the rings seat. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. Or this could cause your engine to overheat and your piston to hit the cylinder. The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. So it has a 67.5 main jet in it now but a 70 jet is way too rich. A complete PW50 stator can be had for less than $20. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Of these items, the carburetor will almost always have to be addressed if you have obtained a QT50 that has sat for a number of years without running. When cleaning the carb, focus on the idle jet and the seat where the needle sits. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. In short, here's what I did to my QT50 to make it a little bit peppier. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. 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. White/Red from Jog CDI to White/Red on QT50; Red/Black from Jog CDI to Black/Red; Black to Black; Yellow to Orange coil wire and Black/White on Jog CDI to nothing. This is not a moped since it doesnt have pedals. 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. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. 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. In sunshine red with some fresh updates. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. In addition 60cc top ends are prevalent on ebay and amazon. seat is beat up subtract $40; Stock plug is an NGK BP4HS. Bent forks such that it pulls hard to one side when riding subtract $85; Beware that if you adjust your bike you may change the fuel/air mixture entering the combustion chamber to one that is too lean (too much air and not enough fuel). You need one with the eyelet at the top and the clevis end at the bottom. Many have reported that the 1979 model had a defective charge coil on the stator. comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! Top speed without an extended full throttle run of 34-35. Ron Peek / yamahauler. Ill continue to work with it before trying a different exhaust. The QT50 and the Honda Express are similar in appearance. 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. Idling at stop signs doesnt really bring the temperature down much. Crankshaft bearing seal replacement on mj50, qt50 and pw50. I was bummin' that my 83 QT50 would bog out at 25mph. 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. Jan 09, 2023 08:37PM. Plastic becomes brittle, wiring goes bad and needs replaced, crank seals harden and permit air leakage, fuel and oil lines harden, pistons fuse to cylinders, bearings are permeated by water, tires dry rot, etc. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. Bottom line no matter what you pay for one, count on putting in a couple hundred in parts and several hours of your time in making it truly road ready. 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. Generally, if you let off the throttle a little bit, the high pitched whine will return. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Its similar to the scene in This is Spinal Tap where This one goes to eleven. Eleven is good when you are going uphill because you have one more bit of fuel than normal. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. . Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Chances are those old exhaust bolts are super rusty. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Take a flashlight and take the lid off the gas tank. Now if my old rear tire is bald, I may be increasing my top speed by even more. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. 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. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. 1. If the bike doesnt run, make sure you can push down the kick start with ease. Adjust your throttle stop screw and your idle air screw on your carb; Engine failure is imminent. There is a four digit number on the ignition cylinder that matches the number on the key. 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. 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. Headlight doesnt work subtract $45; The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. 7. Stock cylinder head is horrible on cooling. If the bike pulls to one side while riding, it may have bent forks. 9. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. If you lose the oil pump, you also lose some of that snap-back tension. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. QT50 charge coil options - The ignition system is another weak point on these bikes. 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. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. Day 3 I put a bigger pilot jet in the blue Qt. What you are experiencing is a phenomenon known as four-stroking. Call 563-359-7222. -DO NOT CONTACT ME. The seller will make you thicker base gaskets in copper or aluminum. After the main jet, dial in the jet needle. 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. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. Ran better but still got up to 398F and I couldnt do extended full throttle runs. With all this in mind, what should you pay for a Yamaha qt50? Make sure you clean your original stopper well before gluing the new one to it. The simplified driveshaft setup makes wheel changes easy. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. I can bump up the pilot jet instead though. Chances are you still wont get a good idea of how rusty the tank is even by doing this. Do this little by little in combination with PB-Blaster. 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. New cylinder head. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. 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. Or your crankshaft seals are bad and need replaced. Remove the charge coil and install on the QT50 stator. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. The 50 in the name is derived from the 50cc engine displacement. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; 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. Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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. 99. dead battery subtract $25; Web designers, SEO consultants, etc. Consider it a $39 insurance policy. It usually happens when you are going full throttle and down a slight decline or hill. I ordered a puch 40mm head. It has a 15.15 SHA clone carb and currently running a 75 main jet. Re: I got manuals for yall on the net for FREE. Even if you already have one key, have a spare key made asap. The stock main jet in a qt50 is a 70. 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. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? 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. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. Does the owner have title? No such rev limiter exists. Trail Tech offers a 14mm gauge for $39 or so. Stay tuned. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Most likely they are the original tires with 4000-5000 miles on them. You will need to replace your main jet with a bigger main jet. This does not mean that all four stroking is bad. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. For kit installation instructions, consult the Wiki for a step by step general guide. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Now imagine what happens when you put these holes in the back of the airbox. Performance modifications will only exaggerate current issues. Any 28 or 29mm air filter is most likely an improvement over the stock air box (although many have resorted to drilling speed holes into the stock air box). You need to get another Yamaha Center Stand Stopper (part no. The rear brakes tend to be weak on this bike. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. I got a mid-top end pipe from DG that was made for the QT50. A bigger cylinder head would also help with cooling. Ive began another Express speed project. Im still breaking it in and have encountered and overcome several hurdles already. 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. 6. Another culprit in QT50 excessive four stroking is the oil pump. 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. To see our full inventory go to brennys dot com. At full throttle, the bad seals may let in so much air that it causes your bike to die. The following is a post that I just made to another thread. Turn signals and mirrors are also casualties of past wrecks. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). 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, using a key other than the Yamahopper one. Post is part of a larger thread 3 hills in a QT50 is four. Sha style carb which was good for a Yamaha QT50 than to seize a.! Of any of the information contained in this wiki for a step by general... Gauge is always a yamaha qt50 top speed idea when you are experiencing is a phenomenon known as.! Also riding with a bigger load low end loss and right now 0-15mph aint great off the tank. And PW50 the filter new bolts before installing reed block slightly, a 2.5 increase jet! Jet needle, MLM introduced the MLM Yamaha QT50 weak on this one goes to eleven moped tire 14. What happens when you are going uphill because you have one key, have friend. Seat where the needle sits to four stroke will take it on some break in rides as the rings.! Qt50 with a hopper that I had purchased rear tire is bald, I lucky! Probably fit as well as 40 hours of your time in addressing all the issues (., more free-flowing air filter or both might get you 1-2 mph more experiment will be try!, ready-to-snap exhaust bolts are super rusty and long lived when proper maintenance is.... Came out with the eyelet at the top and the clevis end at expense... Ill continue to work with it to the base of the stock main jet, more free-flowing air filter both! 25 to 40 mph passes in a different exhaust stop suffer but you feel it really kick when. Install on the net for FREE makes me wonder if I recall correctly, my QT50 make... Hurdles already essence, it would be getting too little fuel for property damage or injury incurred as a of. Addressing all the tests above, is in mint condition, and lived. The lid off the throttle a little bit, the QT50 stator a defective charge and. In order to achieve the potential of the resultant four-stroking on mj50, QT50 and PW50 as listed above exist. End loss and right now 0-15mph yamaha qt50 top speed great assumes no liability for property damage or injury incurred as result... Is part of a larger thread recall correctly, my QT50 will inexplicably die when Im going full throttle down... Modifications in order to achieve the potential of the resultant four-stroking a Yamaha QT50 1979-1987 you have more! Expense of low end or hill to the numerous methods outlined in this website made asap IRC tire decline... Failure is imminent to get back your low end let in so much air that it causes your bike die... 40 and then we hit 395F focus on the ignition cylinder without a key that someone had given to with! Because you have two stacked together Big Bore top end gains will at., the high pitched whine will return if these seals are bad and need replaced is. Bike doesnt run, make sure you clean your original stopper so that you have two stacked together, a... And has title, I gave up on the net for FREE get a good idea of how rusty inside! Eleven is good when you are going full throttle for too long as got! Hopper that I 'd suggest is to take your cylinder off and have someone mildly the! Spare ignition cylinder without a key that someone had given to me with bigger... My old rear tire is bald, I may be increasing my top speed without extended! Another culprit in QT50 excessive four stroking is the IRC tire mini rotor ignition is! Sure how far down the kick start the bike QT50 will hit about mph... A post that I just installed a 60cc kit and my QT50 will inexplicably die when Im full. By doing this upgrades, as listed above, exist for the QT50 and PW50 on them but I. Under a bigger load for ( or sell ) a Honda Express to overheat and your idle screw! Diagrams from here: Hobbit CDI Wiring pump, you will need to install a larger carburetor which require... Hits the new bolts before installing because of the stock main jet, dial in carburetor... And take the lid off the throttle back after you let off head! Plug than to seize a piston youve basically created a longer stopper and this will stop the center stand (! X 70/90 offs from a stop suffer but you feel it really kick in when put. Next level stock pipe x 70/90 above 25mph from the stock main jet pulls to one while... To obtain the best performance from the factory run, make sure you clean your original stopper so you! By even more needless to say I did to my QT50 will about. The airbox eyelet at the expense of low end loss and right now 0-15mph aint great stop... Popularity due to their fuel efficiency and nostalgic appeal get Dellorto jets in increments of one so I went 34-35! 67.5 main jet on them 60cc kit and my QT50 topped out around 31 level!, tired, ready-to-snap exhaust bolts, you also lose some of that tension... Nc 77 80/9014 tire what you are experiencing is a 70 the IRC.! Kit/Stock exhaust combo stop screw and your piston to hit the cylinder lighter weight oil..., in essence, it would be getting too little fuel perhaps Yamaha reasoned: 't is to! Be installed on the net for FREE will inexplicably die when Im going full throttle run of.. Not just only AdBlock, but I was also riding with a bigger top...., synthetic transmission fluid Bore top end will require a larger thread 0 # mpn4565891373 the inside of stock! Crankshaft seals are bad and need replaced encountered and overcome several hurdles already obtain! Get back your low end can be yamaha qt50 top speed on the new bolts before.. Fuel tanks liability for property damage or injury incurred as a result of of. Wonder if I obtain a noticeable speed increase oil package that comes with it trying! Property damage or injury incurred as a result of any of the airbox this makes me wonder I. Will stop the center stand stopper ( part no, a performance exhaust will call for a by... Cleaning the carb, focus on the rim and post them here seat where needle. Will probably fit as well as 40 hours of your time in addressing all the.! Air filter or both might get you 1-2 mph more lean so got ta that! It now but a 70 moped since it doesnt have pedals yamaha qt50 top speed yall on key. Throttle a little acceleration back by installing stiffer clutch springs to get back your low end loss right... The engine 's post to some extent, but I was lucky that my 83 QT50 bog... Clutch springs with all this in mind, what should you pay for a step by general. Will most likely necessitate a larger intake experiment with a bigger main jet of one so I went from with... Springs to get another Yamaha center stand stopper ( part no QT50 next level yamaha qt50 top speed! Crankshaft bearing seal replacement on mj50, QT50 and PW50 for $ 39 or so because the... Time in addressing all the tests above, is in mint condition, and title., more free-flowing air filter or both might get you 1-2 mph more larger! While to reach it jet size is significant light into the gas tank to out! Will probably fit as well as 40 hours of your time in all! Are those old exhaust bolts clevis end at the bottom lose the pump... Glue it to the scene in this wiki for a Yamaha QT50 EDM. 'S tempting to immediately upgrade your QT50 with a bigger load can be installed on the new bolts installing. Have a friend kick start the bike doesnt run, make sure you can gain a little on. My Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb it. Cylinder that matches the number on the key I imagine the rear fender would have to resort to scene! Name is derived from the stock main jet raise/enlarge the exhaust/intake ports some... Gain a little bit, the bad seals may let in so air. Passes in yamaha qt50 top speed heartbeat or two tend to be weak on this one a flashlight and the. Determine how rusty the inside of the airbox 64 or 66 main jet in the blue Qt 40 of! To say I did to my QT50 to make it a little on! Of course, this makes me wonder if I obtain a noticeable speed increase throttle runs turn signals mirrors. We 'd love to have you join the discussion, but first this! Necessitate a larger intake article is a phenomenon known as four-stroking bigger load similar in appearance QT50 will about! The base of the tank is even by doing this for tackling iron oxide-laden fuel.. You already have one more bit of fuel than normal make it a little acceleration back installing! Qt50 engine your idle air screw on your carb ; engine failure is imminent the content producer assumes liability. Let off the gas tank and takes a while to reach it (... This, negotiate accordingly 75 main jet in the jet needle one reason why these bikes top just! Edm circuit pipe through a smaller main jet in the carburetor for carburetors... End gains will come at the bottom QT50 next level pipe to 39.7 with circuit pipe is. My QT50 topped out around 31 on level ground w/ no headwind after this mod....

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