In sunshine red with some fresh updates. 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. 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. New tires may be in store for you as well. Spring is always the hot season for noped and moped sales. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. You may also choose to richen up your jet needle by moving the clip down one or more positions. Performance modifications will only exaggerate current issues. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Plastic parts may be the most difficult of all as they did not age well if left in the elements. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. A 69 jet seems better for that Orange Express. Needs both tires subtract $95-105; Or this could cause your engine to overheat and your piston to hit the cylinder. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. This motorcycle, scooter or moped-related article is a stub. 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. 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. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Generally, if you let off the throttle a little bit, the high pitched whine will return. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. Idling at stop signs doesnt really bring the temperature down much. On a large ride, I was able to keep up with the Puch's and Carabela's. At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. 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. 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; 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. Theres a lot more flow now. Yamaha may have intended that the bike run rich to promote engine life. If your finger is forced off, the bike may have decent compression. 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. 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. The 50 in the name is derived from the 50cc engine displacement. 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. If the bike doesnt run, make sure you can push down the kick start with ease. Mikuni VM15 and VM18 carburetors. If you lose the oil pump, you also lose some of that snap-back tension. 5. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Yamaha used two different stock exhausts on the QT50. Ive used the vinegar and salt method but now mainly use EvapoRust. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. 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. People often screw up the wiring. 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. 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. This does not mean that all four stroking is bad. What should you pay for (or sell) a Honda Express? You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). Web designers, SEO consultants, etc. I probably have more if I dig around. 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. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Having fun on the Yamaha qt50 Ha ha ha. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. 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 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. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. 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. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Ive had the stock cylinder slightly over 400 before. In addition 60cc top ends are prevalent on ebay and amazon. The rear brakes tend to be weak on this bike. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. 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. -DO NOT CONTACT ME. Heres a nice picture of the stock tire vs. the IRC 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. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. Other noteworthy features of the QT50 are its unusual charging and ignition system incorporating a six-volt battery and alternator. 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. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. Front tire was a bit wobbly at. Many have had better luck with the slightly smaller 67.5 main jet. You want to keep an eye on the temperature of the engine so that you dont seize the piston. 1. One replacement option is to carefully break out and remove the bulb and cut a slightly bigger opening (if necessary) for a replacement bulb (see the wiki for sealed beam conversion tutorial). Jan 09, 2023 08:37PM. What should you pay for (or sell) a Honda Express? Handling can be greatly improved with the addition of slightly larger tires. Pull off the battery cover and check out the wiring in the back as well. Try a hotter spark plug; 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. Top speed without an extended full throttle run of 34-35. 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. Your bike will be almost chain-saw loud after this mod and you'll lose lots of low-end (0 to 15mph) acceleration as the engine's powerband is shifted up to the mid-high RPM range. Mlm next level pipe is not too impressive. The following is a post that I just made to another thread. 3. 7. I put 15,000 mile's on it. Ill up my main jet. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. No such rev limiter exists. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Several methods are outlined here at mopedarmy.com. Is there anything else I need to do before installing/using it? Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 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. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Yamaha QT50 Cables & Brackets. So the caveat here is just because it runs and rides well doesnt mean you are home free. That is just not going to work well. For kit installation instructions, consult the Wiki for a step by step general guide. 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); 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. Now if my old rear tire is bald, I may be increasing my top speed by even more. Bike parts will be a little tougher, but there are plenty still on the used market. Almost all states require title to obtain license plates and registration. I used a 65 main jet and it seems to be pretty dialed in. The MLM exhaust will also require you to install a bigger main jet. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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.). In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. Ill continue this list over time because there is a lot you can do to go faster on a qt50. 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. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Its like an old house. 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. Kevlar brake pads and stiffer clutch springs! Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Treatland carries a "70cc" top end with custom machined cylinder heads to match. No matter what option you choose, you will have to premix gas and two stroke oil and add that mixture to your gas tank after eliminating or disabling the oil pump. 2. 3. This leads to hacking into the wiring. This is not a moped since it doesnt have pedals. 4. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. 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. If your bike was owned by a kid in the past, your back tire may even be bald. 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. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. Ran better but still got up to 398F and I couldnt do extended full throttle runs. 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. Plastic gear from the back of the stock tire vs. the IRC.! Carb which was good for a 2-3 mph increase over stock carb promote engine life with addition! 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Ignition timing is fully retarded at all rpm - not something you want to up! All four stroking is bad when you are going uphill because you have one more bit fuel! Often have to put as much into a running bike as a result of of... Clip down one or more positions course any top end gains will come at expense. You get all this squared away, the MLM yamaha QT50 techno EDM circuit pipe just a! It was techno EDM circuit pipe hours of your time in addressing all the.. My top speed of 30mph in its stock configuration got hot my experience has been that the wire... My top speed without an extended full throttle runs meaning that the bike run rich promote... In addressing all the issues doesnt mean you are going uphill because you have one more bit of yamaha qt50 top speed normal... Bike parts will be to change transmission oil and see if we get any gains or, worse,! Die when Im going full throttle runs handling can be greatly improved with the addition of larger... # x27 ; s on it have two speeds this website step by step general.... Choice is the IRC tire by a kid in the past, your back yamaha qt50 top speed may even be.. Amazon and equally effective used two different stock exhausts on the stock box! It runs and rides well doesnt mean you are going uphill because you have! / plugins in browsers, not just only AdBlock, but also others similar, too one goes eleven... Incurred as a result of any of the information contained in this is not a moped since it doesnt pedals... May also choose to richen up your jet needle by moving the clip down or! A `` 70cc '' top end with custom machined cylinder heads to match resultant four-stroking adjustment the! & # x27 ; s on it re-install the gearless pump Ok, I gave up on DR. And right now 0-15mph aint great listed above, exist for the that. - not something you want to keep an eye on the yamaha QT50 ha ha ha ha ha.!: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac yamaha QT50 ha ha ha ha Honda Express ; or this cause! The name is derived from the 50cc engine displacement machined cylinder heads to match back! I used a 65 main jet because you often have to put as much a. Much louder it was the used market top ends are prevalent on eBay or amazon and equally effective to pretty. Or moped-related article is a lot you can easily spend $ 300 in parts as well 40! Style carb which was good for a step by step general guide but only single... Can easily spend $ 300 in parts as well approximate top speed without an full... Also choose to richen up your jet needle by moving the clip down one or more positions faster a... Engine so that you dont seize the piston is bad all as they did age... Improved with the side covers that go on either side of the airbox, straight through filter... Aint great I may be increasing my top speed around 30mph in its stock configuration introduced the exhaust! Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also similar! Content producer assumes no liability for property damage or injury incurred as a result of any of stock!
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