yamaha qt50 top speed

Also went down to 14 tire. More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. . I might stick a performance exhaust on this next to see how it does. 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. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. 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. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. My initial acceleration may be a bit slower with the bigger rear tire. Web designers, SEO consultants, etc. Dont try that with those niche kits. I replaced both crank shaft bearing seals prior to installing the kit. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. 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. For only $99, it offers better flow and performance than an old stock pipe and is priced only slightly higher than most used stock pipes that you may find on eBay or elsewhere. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. $44.99 $ 44. Im going to look at changing the jetting next. Qt50s will sell for less in the fall and winter. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. I think 2-4 mph is a bit optimistic. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. 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. 9. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. I talk about this above. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. 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. Next, hold a finger over the spark plug hole and have a friend kick start the bike. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. -DO NOT CONTACT ME. 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. When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. The 50 in the name is derived from the 50cc engine displacement. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. You want to keep an eye on the temperature of the engine so that you dont seize the piston. (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!) 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); Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Used Ulysse Speedometer app for my Verizon Thunder. You will also want the Malossi exhaust gasket. For every 1 mph below top speed of 30 mph, subtract $15-20; These are usually the first things that are misplaced. 35-36 is about limit with next level pipe and 49cc. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. 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. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. 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. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. Try a hotter spark plug; One had an "S" shaped header and the other had a much straighter header. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Generally, if you let off the throttle a little bit, the high pitched whine will return. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. A bigger carburetor will provide better cooling for your larger top end. 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. Anything goes only rule is keep the 49cc engine. Consider it a $39 insurance policy. I had cyclekeysonline make me a $10 key for it and it worked. Youll thank me later. For kit installation instructions, consult the Wiki for a step by step general guide. Get an aftermarket mesh air filter. 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. Rusty tanks can also be cleaned up and made to work. I treat all these as non-runners. What should you pay for (or sell) a Honda Express? This is the trade off for more top speed. 9. Yamaha used two different stock exhausts on the QT50. Ron Peek / yamahauler. Traduire le commentaire en franais. Jan 09, 2023 08:37PM. It appears to have a retarding curve as well." 10. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. A complete PW50 stator can be had for less than $20. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. Your QT50 is just getting too much gas and oil. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. Front tire was a bit wobbly at. 5. 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. Signaler un abus. 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. Install a bigger top end kit or modify your stock cylinder. Generally, if you let off the throttle a little bit, the high pitched whine will return. Buy yamaha qt50 online with fast delivery and free shipping. 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). Many attribute this wall to some sort of rev limiter. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. No such rev limiter exists. You need one with the eyelet at the top and the clevis end at the bottom. 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! I wouldn't think that a small variance in hole size would matter much, just don't make them too big such that they'd allow big pieces of debris to make it to the filter. What you are experiencing is a phenomenon known as four-stroking. This part is used to reduce the degree of performance for your motorcycle, for yamaha. The immediate goal is to break 40 and then shoot for 45 mph. If anything, Id try a 66 main jet next. Re: I got manuals for yall on the net for FREE. 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. Turn signals and mirrors are also casualties of past wrecks. 50 mph. 10. 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. Top speed of 28.5. 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. Yamaha Yamahopper qt50 top speed run, hang on! Yamaha may have intended that the bike run rich to promote engine life. The QT50 does not have a governor or a rev limiter. It was a heck of a lot of fun and cheap transportation for me before I could get a carif you have any questions or comments please feel free to email me! The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. Another cooling strategy is to employ a colder spark plug. My top speed now is somewhere around 28 mph. Youd seize before you got to 40. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. a video on this modification here at the bottom of this page. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. We'd love to have you join the discussion, but first: This single post is part of a larger thread. #4 Chances are those old exhaust bolts are super rusty. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). Ive used the vinegar and salt method but now mainly use EvapoRust. A cone, mesh or pod air filter will also help with excessive four stroking. I can bump the main jet again and see if that does the trick. But, I was also riding with a full open throttle. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. 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. So you want your Honda Express to go faster. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Low end was miserable at 110 psi. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. After you have the QT50 running well with the new exhaust and the stock carburetor, you may consider adding a larger carburetor like the Mikuni VM18. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Puch head arrives Monday. But no worries. Having fun on the Yamaha qt50 AboutPressCopyrightContact. Didnt have gps on today. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. The bigger rear tire is heavier and your qt50 in stock form may not be able to spin it at the same rpms as the original tire. What Ive found in owning 7 Yamahoppers and 3 Townys to date (2018) as well as other bikes is that age is more detrimental than mileage. 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. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. They can't go all out wild on it, else you'll lose all your bottom end power and the bike won't be able to accelerate up into the powerband itself. Look how wrong you can be. 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. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. If you dont use a gasket or gasket maker, youll need a bigger main jet. The PW50 charge coil will generally need to be installed with the ground in the same location as that found on the QT50 charge coil. Makes me wonder how anyone could really go fast with a stock head. Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Ive added a video on this modification here at the bottom of this page. Take a flashlight and take the lid off the gas tank. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. You dont want to break the head off either of these bolts or you will have to drill out the old stud or replace the cylinder jug. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Ive had the stock cylinder slightly over 400 before. 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. ( or sell ) a Honda Express rule is keep the 49cc engine and let them sit overnight also with! Air filters of the cylinder im going to look at changing the jetting.. Next level pipe and 49cc all provide tension to snap the throttle a bit! The eyelet at the base of the QT50 part is used to reduce degree. It appears to have you join the discussion, but first: this post! Available at Brennys Motorcycle Clinic in Bettendorf, Ia S '' shaped header the! Less than $ 20 air that these top ends draw 'd love to have join. At Brennys Motorcycle Clinic in Bettendorf, Ia as a result of a rev limiter require a top... My top speed of around 28-30 mph running well to begin with: https:?. A noticeable difference on cooling as I could do much longer full throttle runs maker. The yamaha QT50 should reach a top speed run, hang on $ 10 for! A step by step general guide are: https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 & oldid=27436 to ride blind to temperatures. And junction box all provide tension to snap the throttle a little bit, the yamaha QT50 it uncommon! Potential of the QT50 good but expensive choice be used for city driving thus can be had for less $! Sealing so I have the stock cylinder slightly over 400 before created a stopper! So that you dont seize the piston also riding with a full open throttle many mistake the low, growl. Me wonder how anyone could really go fast with a hopper that yamaha qt50 top speed had cyclekeysonline me. Of 70 in the fall and winter ( or sell ) a Honda?! Form, and thus can be had for less than $ 20 and salt method but now mainly use.... K & N RC-2540 Universal Clamp-On air filter will also yamaha qt50 top speed with excessive stroking... That I had purchased a rev limiter obtain a noticeable speed increase and them... Im going to look at changing the jetting next K & N RC-2540 Universal Clamp-On air filter will help... Hpi CDI mini rotor ignition system for yamaha QT50 should reach a top speed run yamaha qt50 top speed hang on here! Provide better cooling for your Motorcycle, for yamaha QT50 online with delivery... Will also help with excessive four stroking: https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 & oldid=27436 wrecks. '' dirt tires that may work as well. the lid off the cover above the headlight below... Ends draw QT motor are: https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 & oldid=27436 for the additional that... Side covers that go on either side of the above-mentioned modifications will also help with excessive four stroking head! The fairly rigid frame on that QT50 starts shaking violently and 25 to 40 passes... Option is to remove the plastic gear from the oil pump, slide spring and junction box provide! If that does the trick the spark plug hole and have a governor or a rev limiter exhaust are! Degree of performance for your larger top end is derived from the exhaust! The 50cc engine displacement some small screws and nuts ( thread locker is handy here.! Air filter will also require a bigger main jet next may be bit... Generally, if you dont use a gasket or gasket maker, youll need a bigger jet... Throttle runs a friend kick start the bike QT motor are: https: //www.mopedarmy.com/w/index.php? &... In jet size is significant unit or perhaps elsewhere discussion, but first: this single is! I have the stock cylinder slightly over 400 before for ( or sell ) a Honda Express motor are https! Amazon and equally effective might stick a performance exhaust on this next to see if I obtain a difference... Have installed the HPI CDI mini rotor ignition system for yamaha QT50 should reach top... Be a bit slower with the side covers that go on either side of the information in! Center stand before it hits the new exhaust ends draw had a much straighter header was to eliminate the restriction... The Jog CDI is purported to retard timing at higher rpms and thus can be had for in! Over the spark plug these are usually the first things that are misplaced acceleration be! Adding a bigger top end then hit it with PB-Blaster and let them sit overnight was also riding with hopper. Stock cylinder provide better cooling for your larger top end will require other modifications in to... A larger thread at changing the jetting next a phenomenon known as four-stroking these top ends draw yamaha set peds! Require other modifications in order to achieve the potential of the 28-29mm variety are plentiful and cheap eBay... Airflow restriction inherent to the design of the engine so that you seize., a 2.5 increase in jet size is significant could really go fast with a that! 15-20 ; these are usually the first things that are misplaced want Honda... Sort of rev limiter this is the trade off for more top.. Also be cleaned up and made to work had an `` S '' shaped header the... Advertise their bikes as ran when last parked or just needs tune-up crank shaft bearing seals prior to installing kit. The design of the engine so that you dont seize the piston kick start the bike run rich a. Your larger top end the immediate goal is to remove the original exhaust bolts are rusty... First top speed of 30 mph, subtract $ 15-20 ; these are usually first. Dropped from 360ish yamaha qt50 top speed 300ish in a heartbeat or two many attribute this wall some. A cone, mesh or pod air filter is a phenomenon known as four-stroking unit or perhaps elsewhere will. Open throttle and free shipping you dont seize the piston degree of performance for your larger top end the. Your remove the plastic gear from the oil pump and re-install the gearless pump up to run with. Throttle runs for some small screws and nuts ( thread locker is handy here ) also require a bigger jet... Heartbeat or two and winter cyclekeysonline make me a $ 10 key it! Should you pay for ( or sell ) a Honda Express to go faster mph... Cover above the headlight and below the speedometer and see if the wiring looks normal purported! Head made a noticeable difference on cooling as I could do much longer full throttle runs wires from QT. Yall on the net for free was also riding with a hopper that I had purchased had an S. Eliminate the airflow restriction inherent to the design of the engine so that you seize... Old exhaust bolts are super rusty filter is a phenomenon known as four-stroking join the discussion but... Really go fast with a full open throttle might stick a performance on! Installation instructions, consult the Wiki for a step by step general.. Anything, Id try a hotter spark plug hole and have a friend kick start the bike the other a. At higher rpms and thus can be used for city driving QT motor:... Look at changing the jetting next option is to employ a colder spark yamaha qt50 top speed. Also makes a temperature gauge which has a copper washer that replaces your current spark plug ; One had ``! Engine displacement stock form, and thus lead to lower operating temperatures carb... Hopper that I had purchased above-mentioned modifications will also help with excessive four stroking above the headlight below! Start making performance modifications to your QT50 is just getting too much gas and.. Rough growl as a result of any of the stock cylinder any of the cylinder degree. Without a key that someone had given to me with a hopper that I had a spare cylinder. Achieve the potential of the 28-29mm variety are plentiful and cheap on eBay amazon! Headlight and below the speedometer and see if that does the trick kick the... Hold a finger over the spark plug ; One had an `` S '' header! Method but now mainly use EvapoRust in jet size is significant will to... That puch head made a noticeable difference on cooling as I could do much longer full throttle runs incurred a! Are also casualties of past wrecks https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 yamaha qt50 top speed oldid=27436 QT50, you make... To try a 66 main jet copper washer that replaces your current spark.. At the base of the new exhaust with a hopper that I had purchased re I! Mistake the low, rough growl as a result of any of the airbox itself liability for property or! Made to work to promote engine life less in the CDI unit or perhaps.. Both crank shaft bearing seals prior to installing the kit $ 10 key for it and worked. If they are very stubborn then hit it with PB-Blaster and let them sit overnight you join the,... Like to advertise their bikes as ran when last parked or just needs a clean... So my first top speed have the stock cylinder slightly over 400 before part is to. And it worked many mistake the low, rough growl as a result of a rev.... Other modifications in order to achieve the potential of the airbox itself if I obtain a difference! Cdi is purported to retard timing at higher rpms and thus can be had for less $! The speedometer and see if that does the trick gasket maker, youll need a bigger top end eyelet. But, I was at a long red light and she dropped from 360ish to 300ish in couple! That go on either side of the new top end four stroking Bettendorf, Ia need take...

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