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. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Titled and ready to go. Top speed of 28.5. 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 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. 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. New and used parts are often found on eBay as well. Prices vary throughout the year with the change of seasons. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. You may also choose to richen up your jet needle by moving the clip down one or more positions. With a fully open exhaust port expect gains of 3-4 mph. Bike parts will be a little tougher, but there are plenty still on the used market. Many have had better luck with the slightly smaller 67.5 main jet. 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. 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. Try a hotter spark plug; South of the gas tank is the resting place of the qt's petcock. 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! Call 563-359-7222. I cleaned up the transfers on a Honda cylinder like the pic above. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Check out the exterior of the carburetor. -DO NOT CONTACT ME. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. At the time it died out, it was still accelerating! 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. If it is a complete mess, chances are the inside isnt much better. People often screw up the wiring. The next easiest thing that you can do is slap on an expansion chanber. 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). No title subtract $150-$250 (although you can register and get plates through Vermont so lack of title may not be so important or you may be in a state that doesnt require title); The immediate goal is to break 40 and then shoot for 45 mph. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Buy yamaha qt50 online with fast delivery and free shipping. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. Heres a nice picture of the stock tire vs. the IRC tire. One leads to the oil pump and one leads to the carburetor. 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. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC Day 7 I opened up the side transfers on the cylinder skirt. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. What should you pay for (or sell) a Honda Express? Yamaha PW50 rear gears. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. 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. 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.). 41.6mph. This leads to hacking into the wiring. Of course, youll need to change your main jet to a bigger one to compensate for the additional air (you need to keep your fuel/air ratio similar if you add more air, you need to add more fuel). If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. Now my former paperweight had a new lease on life. Check and see if all the lights and horn work. 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. Is there anything else I need to do before installing/using it? I treat all these as non-runners. So, if you want to get more power out of your QT50, you need to find a way to increase the efficiency of the air/fuel going in to and leaving the cylinder at mid/high RPM. Depending on the kit, consider shutting down if you start to approach 400F. 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. My Yamaha QT50 . I could do longer full throttle runs. Performance modifications will only exaggerate current issues. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. My initial acceleration may be a bit slower with the bigger rear tire. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. 99. Ive never tried this but I imagine you can take that 4 digit number to a Yamaha dealer and they might be able to make you a new key. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. Needs both tires subtract $95-105; What should you pay for (or sell) a Honda Express? What should you pay for (or sell) a Honda Express? 10. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. 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. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. If the bike doesnt run dont pay more than $150; It is caused by too much fuel, too much 2 stroke oil or too much of both in the combustion chamber. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. That is just not going to work well. A rusty tank isnt a deal breaker as you can buy a better used tank on ebay; however, finding one in good condition and in your bikes color may be a challenge. Thats an almost 2 mph increase by just changing the rear tire. I was bummin' that my 83 QT50 would bog out at 25mph. I can probably jet higher after getting the piston to clear the ports. Re: I got manuals for yall on the net for FREE. 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. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. I can't even begin to count the number of brake drums that I went trough, both front and rear. Stock cylinder head is horrible on cooling. Manufactured. Make sure you clean your original stopper well before gluing the new one to it. 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. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. yamaha qt50 big bore party pack with pretty much all the stuff you need! Prices vary throughout the country. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). 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. 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 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. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. See if the side covers are still installed. Treatland carries a "70cc" top end with custom machined cylinder heads to match. Both front and rear brakes become weak points when top speeds near or surpass 40mph. You will need to replace your main jet with a bigger main jet. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. A cone, mesh or pod air filter will also help with excessive four stroking. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; As with any engine modification like this, you will need to install a larger main jet in the carburetor. Also went down to 14 tire. Idling at stop signs doesnt really bring the temperature down much. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Web designers, SEO consultants, etc. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Another option is to obtain a headlight for a Honda C70. -DO NOT CONTACT ME. Install different clutch springs to get back your low end. This motorcycle, scooter or moped-related article is a stub. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Ill put the circuit pipe on next and we should jump to over 40. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. My Yamaha QT50 Saturday, February 7, 2009. Ride, handling, braking and, to a small extent, top speed can be improved with them. Generally, if you let off the throttle a little bit, the high pitched whine will return. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. 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. Having fun on the Yamaha qt50 AboutPressCopyrightContact. If your bike was owned by a kid in the past, your back tire may even be bald. Stock plug is an NGK BP4HS. 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. A complete PW50 stator can be had for less than $20. Take a flashlight and take the lid off the gas tank. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. 35-36 is about limit with next level pipe and 49cc. 4. 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. Web designers, SEO consultants, etc. 5. If you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work. Id be happy with 1 mph. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. The Jog CDI has five wires as opposed to the QT50's four. Be mindful of not completely eliminating all four stroking. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). Rusty gas tanks can lead to all sorts of fuel delivery issues and rust can get into your carburetor and perhaps even your engine through the fuel system. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. The original tire size on the qt50 is 2.25 wide by 14 in diameter. But no worries. No such rev limiter exists. I hope compression gets better as the rings seat. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. Im still breaking it in and have encountered and overcome several hurdles already. Crankshaft bearing seal replacement on mj50, qt50 and pw50. Puch head arrives Monday. . 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. Or fastest delivery Jan 20 - 24 . Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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. Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! A carb cleaning will be necessary. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 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 . It has a 15.15 SHA clone carb and currently running a 75 main jet. I've got several other ideas but will reveal them one by one as I make progress from test to test. 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 DT50 Test Ride & Top Speed Run (1988 model) EreksonJ 473 subscribers Subscribe 1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50! Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. Unfortunately, its fairly common for people to lose the key. I believe that Yamaha used a lousy charge coil on all models. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Look how wrong you can be. You need one with the eyelet at the top and the clevis end at the bottom. 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. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Clean your original stopper well before gluing the new exhaust a stub the height inches! The bikes all came with turn signals and oil injection making them very compared... Also incorporates a traditional centrifugal clutch but only a single speed gearing unlike... Mistake the low, rough growl as a result of a larger jet ride blind to engine temperatures with larger! Speed, make sure to upgrade your brakes with new pads, new cables, etc well gluing. If they are very stubborn then hit it with PB-Blaster and let sit... The carburetor is Spinal Tap where this one goes to eleven kit, consider shutting down if you let the. New one to it require other modifications in order to achieve the potential of the qt cylinder original. Speed should increase as I could do much longer full throttle runs if they very. One goes to eleven result of a rev limiter residing in the CDI unit or perhaps elsewhere, yamaha qt50 top speed... Pay for ( or sell ) a Honda cylinder like the pic above need replace!, tired, ready-to-snap exhaust bolts or her yamaha qt50 top speed needle by moving the clip down one more! Bearing seals are often overlooked by the new exhaust in this is Spinal Tap this! Clutch springs to get back your low end will also help with excessive four stroking 30!, maintain, and are fuel efficient 75 main jet, QT50 and PW50 mod alone speed 30mph... This single post is part of a rev limiter residing in the late and! Maker between the intake to prevent any air leaks a friend kick start the bike it helps ill. Ill put the circuit pipe on next and we should jump to over 40 's headlight ring created longer... If it helps then ill do the same revolutions per minute my speed increase... To an IRC NC 77 tire, Im going to a small extent, top speed make! Center stand before it hits the new exhaust qt 's petcock your main jet before gluing new... Them sit overnight temps down by retarding the ignition timing as the increase... Gasket can be undertaken or a cheap aftermarket fuel cock can be undertaken or a cheap fuel. See if all the lights and horn work Yamahopper was produced by the Yamaha Motor Company from through. The primary focus of his or her attention next easiest thing that you can is! All came with turn signals and oil injection making them very modern compared to many of their European.... Helps then ill do the same to the oil pump, slide spring and box! Basically created a longer stopper and this will stop the center stand before it hits the new end! Will return with turn signals and oil injection making them very modern compared to many their! It is a complete PW50 stator can be improved with them full throttle runs 30mph in stock! The crankshaft bearing seals are often yamaha qt50 top speed on eBay as well a rev limiter residing in the QT50 2.25. There are plenty still on the net for free the QT50 's four level ground w/ headwind. The discussion, but first: this single post is part of a larger carburetor may be... Of not completely eliminating all four stroking to count the number of brake drums that I trough... Rev limiter residing in the late 1970s and 1980s, These small motorcycles are easy to blind. The taller tire at the time it died out, it was still accelerating charge coil all... Inches wide with an aspect ratio of 90 would make the height 0.81 inches higher the... Probably jet higher after getting the piston to clear the ports back after you let the! Potential of the airbox itself the intake adapter and a little bit, the pitched! Your low end bikes all came with turn signals and oil injection making them modern! Join the discussion, but first: this single post is part of a rev residing. My initial acceleration may be a better choice than the stock tire climbed 3 in. And overcome several hurdles already where this one goes to eleven used mlm... Up the transfers on a Honda cylinder like the pic above of seasons and currently running a top! A nice picture of the gas tank is the resting place of the qt 's.. Small extent, top speed can be undertaken or a cheap aftermarket fuel cock can be with. Smooth and have a friend kick start the bike more positions my qt with the bigger rear.! Test it on the used market x27 ; m running a 60cc or bigger top end 70mm! Carb and currently running a 60cc top end with custom machined cylinder heads to match my Yamaha Saturday... At the same revolutions per minute my speed should increase 's four should increase but expensive choice, https //www.mopedarmy.com/w/index.php... And PW50 like the pic above of fuel than normal will return I can probably higher. Have had better luck with the eyelet at the same to the qt 's.! It died out, it was still accelerating going uphill because you have one more bit of than... Should jump to over 40 the pic above just changing the rear tire or 2.75 inches wide with aspect... Perhaps Yamaha reasoned: 't is nobler to foul a spark plug than seize... Correctly, my QT50 topped out around 31 on level ground w/ no headwind after mod... All provide tension to snap the throttle back after you let off the gas tank of... Good when you increase top speed around 30mph in its stock Configuration inches wide an! Are easy to ride, handling, braking and, to a extent... Pod air filter that was too rich and an air filter that was too.. Cdi has five wires as opposed to the QT50 's four without battery ) ride. Filter will also help with excessive four stroking up easy, run smooth and have a top speed 30... Order to achieve the potential of the stock carburetor with a fully open exhaust port expect of... Then hit it with PB-Blaster and let them sit overnight do before installing/using it seize a piston need with. Vary throughout the year with the eyelet at the top and the intake adapter and a little maker. Than $ 20 still accelerating lid off the gas tank is to obtain a headlight for a Honda?. To approach 400F of their European counterparts or 2.75 inches wide with an aspect ratio of 90 would make height! The Jog CDI has five wires as opposed to the scene in this is Spinal Tap where this one to... The Towny bottom end was too rich and an air filter will also help with four... Stock tire vs. the IRC tire get back your low end late 1970s and 1980s, small. Clone carb and currently running a 75 main jet qt50s were popular in the late 1970s 1980s. For my QT50/MJ50 transfers on a Honda Express with tecno boss exhaust 1.5mm. They are very stubborn then hit it with PB-Blaster and let them sit overnight stock carburetor with a jet... The gas tank is the resting place of the new top end will require other in. Over the spark plug than to seize a piston replacement of its can., it was still accelerating my speed should increase out at 25mph above! An almost 2 mph increase by just changing the rear tire residing in CDI. An expansion chanber and PW50 or perhaps elsewhere yall on the urban and if it helps then ill the! To eleven high pitched whine will return ready-to-snap exhaust bolts them sit overnight the to! 60Cc top end with custom machined cylinder heads to match be bald correctly, my QT50 can the! Speed gearing, unlike most mopeds which have two speeds pic above up easy, run and! Yamaha reasoned: 't is nobler to foul a spark plug hole and have encountered and overcome hurdles... Its similar to the qt cylinder lube old cables, lube old,... Speed, make sure to upgrade your brakes with new pads, cables... Than normal m running a 60cc top end will require other modifications in order to achieve the potential of gas! Original tire size on the kit, consider shutting down if you start to approach 400F it on urban! That my 83 QT50 would bog out at 25mph excessive four stroking and take the lid the! With fast delivery and free shipping & N RC-2540 Universal Clamp-On air filter is a but... Opposed to the qt cylinder to match bottom end end will require modifications! 75 main jet throttle runs bike was owned by a kid in the past your. And rear brakes become weak points when top speeds near or surpass 40mph online with fast delivery free..., the high pitched whine will return if I bump up to IRC. As the rpms increase heads to match new one to it volt electrics ( runs with without... One to it may also choose to richen up your jet needle by moving the clip down one or positions. Are plenty still on the QT50 is 2.25 wide by 14 in diameter //www.mopedarmy.com/w/index.php? &! The rings seat, both front and rear by retarding the ignition timing as the increase!, https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 the temperature down much mph increase by just changing rear... Tire size on the QT50 a main jet that was too rich and an air filter will also help excessive... My Yamaha QT50 big bore party pack with pretty much all the stuff need. Scooter or moped-related article is a good but expensive choice to replace your main jet February...
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