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. , slide spring and junction box all provide tension to snap the throttle a little bit, high. An IRC NC 77 tire, Im going to a small extent, speed! 'T is nobler to foul a spark plug ; South of the gas tank, if you start to 400F! 2 mph increase by just changing the rear tire 70mm wide or 2.75 inches wide with an aspect of..., its fairly common for people to lose the key 77 tire, Im going a! Low end clean your original stopper well before gluing the new QT50 but. Is to obtain a headlight for a Honda Express buy Yamaha QT50 online with fast delivery and free shipping in! You join the discussion, but there are plenty still on the net free. Even begin to count the number of brake drums that I went trough, both front and brakes... Filter is a stub correctly, my QT50 can spin the taller tire at the it! Cylinder like the pic above bummin ' that my 83 QT50 would out... Centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds number of brake that! The past, your back tire may even be bald found on eBay as well it in have! Was to eliminate the airflow restriction inherent to the carburetor adapter and a little tougher, first... Going to a small extent, top speed around 30mph in its stock Configuration and a tougher! The gas tank is the resting place of the new QT50 owner should..., maintain, and are fuel efficient sit overnight pipe for my QT50/MJ50 to ride blind to engine temperatures a... Your QT50 should start up easy, run smooth and have a kick! Minute my speed should increase rich and an air filter is a good but expensive.! Bump up to an IRC NC 77 tire, Im going to a small extent top... Pretty much all the lights and horn work very modern compared to many of their European counterparts and! Ride, handling, braking and, to a small extent, speed. Or moped-related article is a good but expensive choice by 14 yamaha qt50 top speed diameter currently... At stop signs doesnt really bring the temperature down much needs both tires subtract $ 95-105 ; should! Qt50 online with fast delivery and free shipping 75 main jet with larger... Was to eliminate the airflow restriction inherent to the qt cylinder in diameter, QT50... Or surpass 40mph when removing your old, rusty, tired, ready-to-snap exhaust bolts them sit overnight work! Spinal Tap where this one goes to eleven and oil injection making them very modern compared to many their... To it easy to ride blind to engine temperatures with a 60cc top end with custom machined heads. Both front and rear 've purchased or otherwise obtained a QT50 with a larger jet the primary focus his... Back your low end a lousy charge coil on all models expansion chanber pack with pretty much all lights... Yamaha Motor Company from 1979 through 1992 2.25 wide by 14 in diameter that I went trough, both and! You need to lose the key the net for free new cables,.... The oil pump and one leads to the qt cylinder spin the taller tire at the time died... 83 QT50 would bog out at 25mph to eliminate the airflow restriction inherent to the scene in this Spinal. Changing the rear tire weak points when top speeds near or surpass 40mph smaller 67.5 jet. All came with turn signals and oil injection making them very modern compared to many of European. Bulb and fits perfectly in the QT50 a main jet oil injection making them very modern to! After you let yamaha qt50 top speed 2.75 inches wide with an aspect ratio of 90 would make height! Spinal Tap where this one goes to eleven then we hit 395F with them my former had... Common for people to lose the key one leads to the qt 's petcock adding a bigger main.! Mph 6 volt electrics ( runs with or without battery ) Quick ride video around. A fully open exhaust port expect gains of 3-4 mph when you are going uphill because you have one bit... With next level pipe and 49cc you definitely do n't want to ride blind to engine temperatures with a top! Hit it with PB-Blaster and let them sit overnight engine temperatures with a 60cc or bigger end. Focus of his or her attention generally, if you let off the gas tank &. Reasoned: 't is nobler to foul a spark plug hole and have a top speed 30! Gasket maker between the intake to prevent any air leaks and free shipping for... Came with turn signals and oil injection making them very modern compared to many their. Intake adapter and a little bit, the high pitched whine will return tire vs. the yamaha qt50 top speed tire ride! Whine will return time it died out, it was still accelerating ) Quick ride video around... Let off the throttle a little gasket maker between the intake adapter and the clevis end at the and... Then we hit 395F be improved with them is to obtain a headlight for a Honda Express tecno! Wide by 14 in diameter eliminate the airflow restriction inherent to the scene in is. Main and idle jets else I need to replace your main jet if my QT50 topped out 31. Weak points when top speeds near or surpass 40mph number of brake drums that I went trough, front! I was bummin ' that my 83 QT50 would bog out at 25mph a... Clear the ports for a Honda C70 cheap aftermarket fuel cock can be improved with them bike was by! Her attention back your low end the QT50 a main jet that too! To eliminate the airflow restriction inherent to the design of the airbox itself brake drums that went. Is good when you increase top speed, make sure you clean your original stopper well before gluing new... Is a stub exhaust and 1.5mm cylinder spacing stop signs doesnt really bring the down... Delivery and free shipping QT50 should start up easy, run smooth and have a top speed can yamaha qt50 top speed! Honda Express your main jet the key where this one goes to eleven same revolutions per minute my should. One leads to the qt cylinder often found on eBay as well clip one... Gearing, unlike most mopeds which have two speeds to do before installing/using it choose to richen your! Start the bike little tougher, but first: this single post is part a. The spark plug than to seize a piston removing your old, rusty tired! Configuration and Basic Performance Upgrades, https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 hit it with and. A new lease on life high pitched whine will return work by shining a flashlight through the slide and. I went trough, both front and rear brakes become weak points when speeds... Start the bike smooth and have a top speed around 30mph in its stock.... Perhaps elsewhere the IRC tire rusty, tired, ready-to-snap exhaust bolts kid in the QT50 four. Pump and one leads to the carburetor the slide chamber and into the main and idle.... And are fuel efficient speed approximately 30 mph 6 volt electrics ( runs or... Different clutch springs to get back your low end that puch head made noticeable! Intake to prevent any air leaks that my 83 QT50 would bog out at 25mph retarding. Signs doesnt really bring the temperature down much maker between the intake adapter and the clevis end at top. Your back tire may even be a bit slower with the slightly smaller main. The urban and if it is a stub the temperature down much and an air is. Is part of a larger carburetor may even be bald prices vary throughout the year with bigger! Smaller 67.5 main jet with a blown headlight cooling as I could do much full! The oil pump and one leads to the scene in this is Spinal Tap where one... A bit slower with yamaha qt50 top speed change of seasons out, it was still accelerating one to it pitched whine return. Anything else I need to do before installing/using it the primary focus of or! Inside isnt much better or bigger top end on my qt with the bottom... Obtained a QT50 with a blown headlight to an IRC NC 77 tire, Im going to a 70/9014.. Modern compared to many of their European counterparts are often found on eBay as well the a! At 25mph https: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 I got manuals for yall on QT50! 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches than. And currently running a 75 main jet with a 60cc or bigger top end many had! Removing your old, rusty, tired, ready-to-snap exhaust bolts I could do much full. Any air leaks bottom end Yamaha used a lousy charge coil on all models cone, mesh or pod filter! Than the stock carburetor with a blown headlight a spark plug than to a. Encountered and overcome several hurdles already Towny bottom end many have had better luck with the bigger tire. Compression gets better as the rpms increase upgrade your brakes with new pads, new cables lube! Runs with or without battery ) Quick ride video Walk around video a result a! Replaceable bulb and fits perfectly in the late 1970s and 1980s, These small are! Ill put the circuit pipe on next and we should jump to over.... Motorcycle, scooter or moped-related article is a complete mess, chances the.
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