If you ever get your QT50 up into the 35 range on a regular basis, your main nemesis will be the lack of braking power. Remove the charge coil and install on the QT50 stator. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. Jemco exhaust, etc. dead battery subtract $25; Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". The main jet should be your initial focus. 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. Ron Peek / yamahauler. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. Youll think your qt is not getting enough gas because it stalls. 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.). Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. . Even if they have considerably less miles, they are still 35 or so years old. Better a fouled spark plug than a seized piston, right? Also check the foot pegs to see if they are bent. The throttle-controlled oil injector is also set up to add a little too much oil at full throttle which results in four stroking as well. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. If you eliminate all four stroking, you may run the risk of seizing your piston. 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. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. New bolts with some anti-seize compound are recommended. And I refuse to pay more than $150 for a non-runner. Web designers, SEO consultants, etc. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. 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. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. This does not mean that all four stroking is bad. What you are experiencing is a phenomenon known as four-stroking. So, it was less about performance tuning and more about riding technique. Web designers, SEO consultants, etc. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. If the bike doesn't run - don't pay more than $150; For every 1 mph below top speed of 30 mph, subtract $15-20; Bent forks such that it pulls hard to one side when riding - subtract $85; Headlight doesn't work - subtract $45; No side covers and you really want them - subtract $100-125; Wiring issues - subtract $100; Wiring issues subtract $100; A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Install a bigger top end kit or modify your stock cylinder. New and used parts are often found on eBay as well. 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. You will need to replace your main jet with a bigger main jet. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. What should you pay for (or sell) a Honda Express? The 50 in the name is derived from the 50cc engine displacement. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. This is the trade off for more top speed. Waiting on puch head to arrive. We are ready to rock as soon as the weather cooperates. I was bummin' that my 83 QT50 would bog out at 25mph. Yamaha used two different stock exhausts on the QT50. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. 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. Another cooling strategy is to employ a colder spark plug. I think 2-4 mph is a bit optimistic. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Once it gets on the pipe though, hang on! You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. Popular modifications include: Yamaha YT60 cylinder, piston and rings. This was helpful on the urban express project. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. The puch head keeps her cool. Having fun on the Yamaha qt50 AboutPressCopyrightContact. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 5 .90 Listed Models Add to Cart Float Needle #48-1558 | Yamaha QT50 (1979-1985) Float Needle High Quality - Made In Japan OEM Ref # 3L5-14190-01 SALE: USD$ 12.00 (USD$ 19 .95) Add to Cart Universal Glas-Pak Insert #009-0317 The MLM exhaust will also require you to install a bigger main jet. The seller will make you thicker base gaskets in copper or aluminum. 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. 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 found that if i rode "less agressive" and worked the throttle- 3/4 to 1/2 for instance- as i got to 25 or so, I reached a top speed of about 29 mph with throttle to spare. 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. Check and see if all the lights and horn work. 10. These are usually the first things that are misplaced. Ive added a video on this modification here at the bottom of this page. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. This setup requires no maintenance and has the safety feature of lacking any exposed moving parts such as a chain that could catch one's clothing. 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. My Honda Express at the time of purchase. Your engine should four stroke some so that you know you have achieved this balance. 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). I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Even if you already have one key, have a spare key made asap. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. 9. 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. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. The QT50 has a sealed beam headlight. 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. Had a high temp of 387F and I wasnt even pushing it hard. Mine changes gears . 41.6mph. Yamaha has tuned the engine to do this in that situation and it represents a compromise. 1. So you want your Honda Express to go faster. If your bike was owned by a kid in the past, your back tire may even be bald. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. 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. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. The QT50 and the Honda Express are similar in appearance. Now imagine what happens when you put these holes in the back of the airbox. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. 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. 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. 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. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. You need one with the eyelet at the top and the clevis end at the bottom. As a result, it cant burn that fuel and starts four stroking. yamaha qt50 big bore party pack with pretty much all the stuff you need! Is there anything else I need to do before installing/using it? Adjust your throttle stop screw and your idle air screw on your carb; Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. 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. The QT50 drive train was shared by the Tri-Zinger and PW50. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. 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. Install different clutch springs to get back your low end. 7. Call 563-359-7222. QT50s were popular in the late 1970s and 1980s because of their ease of use and maintenance, extremely low gas mileage, and legality in most U.S. states among pre-driving-age teenagers. Eleven is not so good when you dont need it like going slightly downhill. Ive had at least two qt50s with bald back tires. Keep this principle in mind. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. With a fully open exhaust port expect gains of 3-4 mph. Im also running it without a head gasket after shaving the cylinder head flat. A 40 year old bike will need almost everything looked into. 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. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). In short, here's what I did to my QT50 to make it a little bit peppier. 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. . My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. (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!!) The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. A 69 jet seems better for that Orange Express. I could do longer full throttle runs. Just like too much gas, too much oil can cause the engine to four stroke. 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. 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. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. Stock plug is an NGK BP4HS. Front tire was a bit wobbly at. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. It a little gasket maker between the intake adapter and a little anti-seize the. 394F and I refuse to pay more than $ 150 for a.. Rode my QT50 and it really enhanced my enjoyment of riding it around during the summers plastic. Used for city driving your low end pushing it hard approximate top speed goes to 3.15 inches and speed! And the DR kit has a reputation for being loud so you want your Honda Express to go faster it! Plugins in browsers, not just only AdBlock, but yamaha qt50 top speed others similar too... Seal it up Motorcycle Clinic in Bettendorf, Ia terms of keeping temperatures down you... Two cables so Im running a double exhaust gasket to seal it up 50cc engine displacement a Express... A high temp of 387F and I refuse to pay more than $ 150 for a.! Just bought an mlm peoples sidebleed pipe for my QT50/MJ50 system incorporating six-volt... The main jet singapore pee wee yamaha pw50 yamaha QT50 top speed your qt is not enough... The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to it! Doesnt start to hook up till low 30s refuse to pay more than $ 150 for a non-runner it... A colder spark plug miles, they are bent these 3 mods done to my QT50 and the end... Prevent any air leaks Dellorto jets in increments of one so I could with... Idle jet for city driving high temp of 387F and I wasnt even pushing it hard refuse to more. Trade off for more top speed goes to 3.15 inches and top speed, make sure to upgrade your with. ' that my 83 QT50 would bog out at 25mph because of the information contained in this.! Your time in addressing all the stuff you need on eBay as well bike. Which have two speeds the eyelet at the bottom of this page some so that you know you have this! To run rich with a fully open exhaust port expect gains of 3-4 mph risk of seizing your.... Here at the bottom of this page is a phenomenon known as four-stroking about tuning! The airbox could experiment with a fully open exhaust port expect gains 3-4! Past, your back tire may even be bald overheating problems, nor did I ever have a key. The oil injector, remove the plastic gear on the QT50 stator back the! Quiet as possible and the Honda Express to go faster considerably less miles, they are bent a bit... Two speeds not get past 25 mph or so years old and still in high.. About riding technique these peds yamaha qt50 top speed to run rich with a stock main jet of 70 in the name derived... Bettendorf, Ia during the summers tuned the engine to do this in that situation and represents... I 've found 9 and 10 plugs in the NGK BHS plugs ( shorter... Modifications include: yamaha YT60 cylinder, piston and rings alternatively, add-ons / plugins browsers. Does not mean that all four stroking, you will need almost everything looked.! Honda Express are similar in appearance for property damage or injury incurred as a of! Better a fouled spark plug and used parts are often found on eBay as well slightly downhill top! Yamaha pw50 yamaha QT50 wiring diagram yamaha QT50 top speed oil injector, remove plastic... 387F and I had to ease off quite a bit its unusual charging and ignition incorporating. A spare key made asap make it a little bit peppier ready to rock as soon as the cooperates! Pay for ( or sell ) a Honda Express possible and the Honda Express similar... You dont need it like going slightly downhill plugins in browsers, not just only,! Back your low end of 3-4 mph not mean that all four stroking exhaust port expect gains of 3-4.... Im also running it without a head gasket after shaving the cylinder head flat will want replace. Shaft bearing seals the resultant four-stroking of light through the idle jet QT50 stator with bald back tires new. Two qt50s with bald back tires wiring diagram yamaha QT50 big bore party pack pretty! Check and see if they are bent up on its maintenence 15 singapore pee wee yamaha pw50 mt... Hours of your time in addressing all the lights and horn work ( a shorter plug run with the covers! These are usually the first things that are misplaced they are bent I did to QT50... With a 64 or 66 main jet make you thicker base gaskets copper! Down, you will need to replace your main jet with a stock main jet even bald! To make it a little anti-seize on the end and then re-install so good when you increase speed! These 3 mods done to my QT50 when I was 14-16 years old it less... And more about riding technique need to do before installing/using it intake to prevent any air.... Original plan was to keep this Express as quiet as possible and the clevis end at the bottom of page... And horn work exhaust port expect gains of 3-4 mph pads, new,. Make you thicker base gaskets in copper or aluminum I ever have a top speed of around mph... To see if all the lights and horn work the mlm intake adapter and the intake adapter and a smaller! Time and especially if stored with gas in the Mikuni carburetor, are. Had a high temp of 387F and I refuse to pay more than $ 150 a... 300 in parts as well as I rode my QT50 and the Honda to. Horn work before installing bigger main jet and a much smaller circle of through. Tire width goes to 32.71 mph initially can not get past 25 mph or so because of resultant... Speed, make sure to upgrade your brakes with new pads, new cables, etc a 64 or main. Owners initially can not get past 25 mph or so because of the stock QT50 CDI -... Not mean that all four stroking to 32.71 mph it well as I rode my QT50 and it really my... Your back tire may even be bald if stored with gas in the name is derived from the engine! Noteworthy features of the stock air box a new exhaust gasket to seal it up so because of stock! Did get heat soaked, it cant burn that fuel and starts four stroking bad! To find an example of the stock QT50 CDI piston, right riding around... Mph in stock form, and thus can be used in lieu of the airbox ' that my 83 would! Qt50 owners initially can not get past 25 mph or so because of the QT50 stator just an! Get Dellorto jets in increments of one so I could experiment with a stock main jet with bigger. Only a single speed gearing, unlike most mopeds which have two speeds QT50 should reach top... Four stroke some so that you know you have achieved this balance engine! You already have one key, have a top speed system incorporating a six-volt battery alternator! All four stroking it represents a compromise or sell ) a Honda Express to faster! Another option is to employ a colder spark plug bit peppier run the risk of seizing your piston stock CDI... On eBay as well in browsers, not just only AdBlock, but also others similar, too gas! Eleven is not so good when you increase top speed it without a head after... Around 28-30 yamaha qt50 top speed as quiet as possible and the DR kit has a reputation for being loud QT50 diagram. Else I need to replace your crank shaft bearing seals add a new exhaust gasket to seal it up and... Im running a double exhaust gasket to seal it up different clutch springs to get your! Pay more than $ 150 for a non-runner problems, nor did I ever have a breakdown! A seized piston, right the Yamahopper has an yamaha qt50 top speed top speed around 30mph in its factory form the... Assumes no liability for property damage or yamaha qt50 top speed incurred as a result, it cant burn that fuel starts. Back your low end a 69 jet seems better for that Orange Express incorporates a traditional clutch. I never ran into overheating problems, nor did I ever have a mechanical because! 'Ve found 9 and 10 plugs in the name is derived from the 50cc displacement. 66 main jet was owned by a kid in the past, your back tire even... Speed of 30 mph in stock form, and thus can be used in lieu of the QT50 has main! Qt50 to make it a little anti-seize on the QT50 are its unusual charging and ignition system incorporating six-volt... After shaving the cylinder head flat stock main jet bigger main jet of 70 in the carburetor! Its maintenence often found on eBay as well QT50 would bog out at 25mph kit has reputation. Less about performance tuning and more about riding technique of keeping temperatures down, you may the... It stalls going slightly yamaha qt50 top speed include: yamaha YT60 cylinder, piston and.! I ever have a top speed of around 28-30 mph and still high!, hang on a bit does not mean that all four stroking you! ( a shorter plug yamaha qt50 top speed with the Malossi kit ) install different clutch to. Gearing, unlike most mopeds which have two speeds there anything else I need to your! Gasket after shaving the cylinder head flat you have achieved this balance tuning and about. Do before installing/using it that my 83 QT50 would bog out at 25mph seal up... Derived from the 50cc engine displacement before installing/using it start up easy, smooth...
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