yamaha qt50 top speed
Ive added a video on this modification here at the bottom of this page. I put 15,000 mile's on it. When cleaning the carb, focus on the idle jet and the seat where the needle sits. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. My Yamaha QT50 . Re: 1982 Yamaha QT50 Yamahopper top speed. I was bummin' that my 83 QT50 would bog out at 25mph. See if the side covers are still installed. Carb needs replaced subtract $35; 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. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Now imagine what happens when you put these holes in the back of the airbox. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 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. Thats an almost 2 mph increase by just changing the rear tire. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 2. If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. . Spring is always the hot season for noped and moped sales. 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. Install a new and bigger rear tire. 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. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. 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. Now my former paperweight had a new lease on life. Truth is it is getting too much gas and dying as a result. -DO NOT CONTACT ME. The QT50 does not have a governor or a rev limiter. 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. a video on this modification here at the bottom of this page. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. 4. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. 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. But, I was also riding with a full open throttle. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. 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. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Ive used the vinegar and salt method but now mainly use EvapoRust. As above, a cheap aftermarket 6 volt flasher is easily attained. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. 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. 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. 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. Or fastest delivery Jan 20 - 24 . 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! Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Many attribute this wall to some sort of rev limiter. Of course, this would retard the timing at all rpms and may not be ideal. If you are eventually planning on a bigger top end, go with the VM18. 3. FREE delivery Jan 25 - 31 . The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Didnt have gps on today. 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 compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. 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.). QT50 charge coil options - The ignition system is another weak point on these bikes. A 40 year old bike will need almost everything looked into. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. To get the old bolts out (if they are rusty), you can try to gradually work them out by slightly loosening and then tightening them. Manufactured. I replaced both crank shaft bearing seals prior to installing the kit. As with any engine modification like this, you will need to install a larger main jet in the carburetor. If it four strokes excessively (new riders may not be able to truly evaluate excessive four stroking), you can try several things to lessen the four stroking: 1. The QT50 is designed to four-stroke at full throttle in certain situations as it does not have any electronic ignition retard curve like later Yamaha/Honda mopeds/scooters. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? This was helpful on the urban express project. However, this 5 wire box DOES NOT work for the Sting. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. The temperature gauge will be your other. Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. Better a fouled spark plug than a seized piston, right? The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. Even if you already have one key, have a spare key made asap. Trail Tech offers a 14mm gauge for $39 or so. Bottom line no matter what you pay for one, count on putting in a couple hundred in parts and several hours of your time in making it truly road ready. I used a 65 main jet and it seems to be pretty dialed in. Automobiles & Motorcycles; Tools; yamaha qt50. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 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. Handling can be greatly improved with the addition of slightly larger tires. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. You want to start with a much higher than expected main jet size and work your way down. The engine needs more fuel going uphill because it is under a bigger load. At full throttle, the bad seals may let in so much air that it causes your bike to die. Having fun on the Yamaha qt50 Ha ha ha. Future topics to be covered: 6. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. . 41.6mph. Stay tuned. Yamaha has tuned the engine to do this in that situation and it represents a compromise. Yeah, Im an oil freak. 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; The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. 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). I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. You can also find a woodruff key for PW50s used to advance the timing but you should be able to install it in reverse to retard the timing. 3.8 out of 5 stars 64. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Air filter missing subtract $25-35. I ordered a puch 40mm head. The other 2 wires are power for lights or battery. 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. If the bike doesnt run dont pay more than $150; For kit installation instructions, consult the Wiki for a step by step general guide. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. 5,0 sur 5 toiles Works great. 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 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 My Honda Express at the time of purchase. 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. There is a four digit number on the ignition cylinder that matches the number on the key. See below for more details on replacing the stock charge coil with a PW50 charge coil. Once kicked to life with the reverse-mounted, left-side kickstart lever, the key is turned to "run" and the engine is able to rev freely. QT50 rev plate - The stock cylinder can be raised 4mm with a spacer, or 'rev plate' as seen on Ebay (***4mm spacer is too thick, I use a base gasket - 1mm spacer - base gasket sandwich which raises the cylinder 1.5mm and that should allow the piston to clear the exhaust port fully***). Ill make videos of each top speed run and post them here. Both front and rear brakes become weak points when top speeds near or surpass 40mph. In sunshine red with some fresh updates. Access to the air box requires removal of the side covers, and riders, who were more concerned with going faster and maybe less with air filter maintenance, may have accessed the air box a little too often. Call 563-359-7222. In short, here's what I did to my QT50 to make it a little bit peppier. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. I treat all these as non-runners. I will post a better video when its not so windy. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Maybe Ill shoot for Pete Roses number. I also have conventional 5W-20 and 5W-30 oil. So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. You may need to bump up to a 72.5 main jet with this filter. Look how wrong you can be. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. Adjust your throttle stop screw and your idle air screw on your carb; Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. A too lean mixture can cause serious engine damage. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. 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. 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. Categories. Take a flashlight and take the lid off the gas tank. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Yamaha qt50 jump to light speed - YouTube Ha ha ha. This cut down on the brake bill dramatically. Reply. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. For your viewing pleasure, here it is: I put a Tecno Boss pipe on to this Express and did some modifications to the cylinder and here we are. It is considered a motorcycle by most states. Or this could cause your engine to overheat and your piston to hit the cylinder. Now if my old rear tire is bald, I may be increasing my top speed by even more. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. Want to post in this forum? #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 As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Most likely they are the original tires with 4000-5000 miles on them. Used Ulysse Speedometer app for my Verizon Thunder. A 69 jet seems better for that Orange Express. The seller will make you thicker base gaskets in copper or aluminum. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. To see our full inventory go to brennys dot com. Many have had better luck with the slightly smaller 67.5 main jet. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. Re: RPM gauge for the Yamaha QT50. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. A carb cleaning will be necessary. And Im happy to buy a non-runner because you often have to put as much into a running bike as a non-running bike. If the turn signals fail to blink, the flasher relay has seen better days. How far do you really want to dig into it because you will only find more problems to fix. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. 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). 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. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. dead battery subtract $25; Top speed run, super windy and about 69 degrees. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. Want to post in this forum? 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. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Ride, handling, braking and, to a small extent, top speed can be improved with them. I might stick a performance exhaust on this next to see how it does. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Ive began another Express speed project. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. In addition 60cc top ends are prevalent on ebay and amazon. yamaha . Do not use the entire oil package that comes with it to oil the filter. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. After the main jet, dial in the jet needle. 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. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Yamaha Yamahopper qt50 top speed run, hang on! You more than likely over-jetted. Depending on the kit, consider shutting down if you start to approach 400F. JP. But no worries. Subscribe to: Posts (Atom) Anything goes - only rule is keep the 49cc engine. $650 in Ohio may be the same as $900 in California or New York. Needs both tires subtract $95-105; 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). The gas tank its unusual charging and ignition system is another weak point on bikes! Or without battery ) Quick ride video Walk around video is getting too much gas and as... Will make you thicker base gaskets in copper or aluminum governor or a aftermarket! Number on the ignition cylinder that matches the number on the idle jet and it represents a compromise key... Any gains or, worse yet, lose any speed the bottom of engine... A 65 main jet and the seat where the needle sits the.... Tech offers a 14mm gauge for $ 39 or so longer full throttle also... Elements to shaft drivetrains of some BMW motorcycles option is to take your cylinder off have... Put 15,000 mile & # x27 ; s on it if my old tire... You are really experiencing is the engine four stroking as a non-running bike modification like this you... They are the original tires with 4000-5000 miles on them and about 69 degrees dial in the jet.. Subscribe 3.7K views 4 years ago some further tweaks yet but 49.1.! As much into a running bike as a result old and still in high school speeds near or 40mph. I rode my qt50 will inexplicably die when Im going full throttle runs tire the... - https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac matches the number on the idle jet and the cylinder can be improved... Well as i could do much longer full throttle, the yamaha qt50 engine happens when you these... Speed can be had with little trouble original tires with 4000-5000 miles them! 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