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, using a key other than the Yamahopper one. One leads to the oil pump and one leads to the carburetor. You want to start with a much higher than expected main jet size and work your way down. 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. 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. Maybe sooner if you want to be more cautious. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); I used a 65 main jet and it seems to be pretty dialed in. I ordered a puch 40mm head. 7. Install an MLM peoples sidebleed exhaust. Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. Another option is to obtain a headlight for a Honda C70. You will need to remove an equal amount of material from the top of the cylinder jug to compensate for the copper base gasket and paper base gaskets sandwiching it. Ive began another Express speed project. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. 2. White/Red from Jog CDI to White/Red on QT50; Red/Black from Jog CDI to Black/Red; Black to Black; Yellow to Orange coil wire and Black/White on Jog CDI to nothing. 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. Overheating and piston seizure are traps for the unwary. Ill continue this list over time because there is a lot you can do to go faster on a qt50. 5,0 sur 5 toiles Works great. Id be happy with 1 mph. YES! I also have conventional 5W-20 and 5W-30 oil. 4. You more than likely over-jetted. A bigger carburetor will provide better cooling for your larger top end. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. What should you pay for (or sell) a Honda Express? Anything goes only rule is keep the 49cc engine. Your main jet is way too big. Last edited on 22 November 2022, at 05:58, "Retrospective: 1979-1992 QT50 Yamahopper | Rider Magazine", https://en.wikipedia.org/w/index.php?title=Yamaha_QT50&oldid=1123157659, This page was last edited on 22 November 2022, at 05:58. 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. JP. . 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. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. So it has a 67.5 main jet in it now but a 70 jet is way too rich. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. As a result, it cant burn that fuel and starts four stroking. The Mikuni VM18 carb is almost as lethal as nitrous. Generally, if you let off the throttle a little bit, the high pitched whine will return. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. Prices vary throughout the year with the change of seasons. 5. 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. Once I establish my current top speed, Ill start making adjustments and see what results. The PW50 is a children's dirt bike which has different gearing in the hub, which can be used on the QT50 (stock splined QT axle must be pressed into PW ring gear and run in PW's housing), there are also performance parts made for the PW50, many of which will fit the QT50 though parts that must attach to the frame may need to be modified. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. The following is a post that I just made to another thread. 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.). 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. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. The 50 in the name is derived from the 50cc engine displacement. You want to keep an eye on the temperature of the engine so that you dont seize the piston. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. 99. Although branded as a front tire, it will work on both the front and rear of the QT50. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Install a bigger top end kit or modify your stock cylinder. 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. I was bummin' that my 83 QT50 would bog out at 25mph. Performance modifications will only exaggerate current issues. Didnt have gps on today. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. A combination of the above. So I can compare temps between stock head and puch head. Rinse and repeat several times. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Web designers, SEO consultants, etc. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. On a large ride, I was able to keep up with the Puch's and Carabela's. Im hoping an extra 25 psi helps out quite a bit. 6. If two-stroke oil has been left in the oil tank during your QT50s extended break from action, it's not uncommon for that oil to leak from the tank into the carburetor and even into the cylinder. 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). Air filter missing subtract $25-35. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. If the bike pulls to one side while riding, it may have bent forks. Of course, this would retard the timing at all rpms and may not be ideal. Ill be interested to see the difference in head temps as compared to stock head. Yamaha's conservative approach leads us to our first performance upgrades. So you want your Honda Express to go faster. These are usually the first things that are misplaced. 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. Web designers, SEO consultants, etc. . The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. I could do longer full throttle runs. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Manufactured. 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 QT50 does not have a governor or a rev limiter. Having fun on the Yamaha qt50 AboutPressCopyrightContact. Day 1 - 49cc engine is on my blue qt50. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. How far do you really want to dig into it because you will only find more problems to fix. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. 10. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. If the bike doesnt run dont pay more than $150; Consider it a $39 insurance policy. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. I put 15,000 mile's on it. pwonly.com offers up a 50cc top end with a decked cylinder and a 4mm rev plate if you choose not to do the work yourself. Mlm next level pipe is not too impressive. Perhaps around 10% bigger than stock. New and used parts are often found on eBay as well. PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. 2 stroke engines are designed to four stroke in certain situations. Now imagine what happens when you put these holes in the back of the airbox. I might stick a performance exhaust on this next to see how it does. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. 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. (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!!) Ive got several other ideas but will reveal them one by one as I make progress from test to test. 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. You can gain a little acceleration back by installing stiffer clutch springs. 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. You will need to replace your main jet with a bigger main jet. 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. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. #3 billtrout , Jun 20, 2013 #4 billtrout Adventurer Joined: Aug 15, 2012 Oddometer: 10 Location: Jersey I rode one for a couple of years, it was my first rode legal Bike. Just like too much gas, too much oil can cause the engine to four stroke. The simplified driveshaft setup makes wheel changes easy. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Many attribute this wall to some sort of rev limiter. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. I think 2-4 mph is a bit optimistic. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 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 10. 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. 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. Yamaha has tuned the engine to do this in that situation and it represents a compromise. Bike parts will be a little tougher, but there are plenty still on the used market. 6. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. I got my MC license on that scooter. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. Traduire le commentaire en franais. Your QT50 is just getting too much gas and oil. If you lose the oil pump, you also lose some of that snap-back tension. Having fun on the Yamaha qt50 Ha ha ha. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. 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. Try an 80 or 85 main jet. If you are eventually planning on a bigger top end, go with the VM18. Automobiles & Motorcycles; Tools; yamaha qt50. 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. When cleaning the carb, focus on the idle jet and the seat where the needle sits. You need to get another Yamaha Center Stand Stopper (part no. In stock configuration, the QT50 will hit about 29-30 mph. What should you pay for (or sell) a Honda Express? I cleaned up the transfers on a Honda cylinder like the pic above. Top speed run, super windy and about 69 degrees. Turn signals and mirrors are also casualties of past wrecks. Im located in Ohio. This is not a moped since it doesnt have pedals. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. Puch head arrives Monday. If it goes slower than this, negotiate accordingly. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. I probably have more if I dig around. Re: RPM gauge for the Yamaha QT50. What a ride it was! Yamaha PW50 rear gears. I treat all these as non-runners. Carb needs replaced subtract $35; 278-27114-00) and super glue it to the original stopper so that you have two stacked together. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. While such air leaks remain, for the most part, benign in the qt's stock configuration, the addition of larger displacement pistons and cylinders resulting in higher rpms magnify the amount of air leaking past these decrepit seals. If you go farther than that or go hog wild on the porting, you will need to rejet to keep the correct We did have to play around with tne needle and the air screw though to get it dialed in to where my dad and I wanted it to be though. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. Ive had at least two qt50s with bald back tires. Check and see if all the lights and horn work. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. The rear brakes tend to be weak on this bike. 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. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. Take a flashlight and take the lid off the gas tank. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. 2. A 40 year old bike will need almost everything looked into. Or your crankshaft seals are bad and need replaced. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. $650 in Ohio may be the same as $900 in California or New York. 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. Couldve easily seized it with an extended full throttle run. Engine failure is imminent. Treatland carries a "70cc" top end with custom machined cylinder heads to match. Well, I hope you and others find my experience useful. 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 assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. It still has the stock exhaust which may be a huge limiting factor. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). The VM18 will require MLM's intake designed for the VM18. See below for more details on replacing the stock charge coil with a PW50 charge coil. However, this 5 wire box DOES NOT work for the Sting. And I refuse to pay more than $150 for a non-runner. 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. 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). 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. Call 563-359-7222. 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. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. Generally, if you let off the throttle a little bit, the high pitched whine will return. 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. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. I can bump up the pilot jet instead though. Such puny gains are not going to satisfy your QT50 fanatic. Yamaha qt50 jump to light speed - YouTube Ha ha ha. 3.8 out of 5 stars 64. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. Try a slightly smaller main jet; 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. Makes me wonder how anyone could really go fast with a stock head. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. Im also running it without a head gasket after shaving the cylinder head flat. Yamaha QT50 Cables & Brackets. Most likely they are the original tires with 4000-5000 miles on them. 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. Install a new and bigger rear tire. . Home. Youd seize before you got to 40. Youll thank me later. So, it was less about performance tuning and more about riding technique. 1. Idling at stop signs doesnt really bring the temperature down much. This was helpful on the urban express project. Ive added a video on this modification here at the bottom of this page. Categories. If anything, Id try a 66 main jet next. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. We are back up and running. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. 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. Want to post in this forum? Titled and ready to go. As above, a cheap aftermarket 6 volt flasher is easily attained. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. A temperature gauge is mission critical to keeping your piston from soft seizing. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. Next step will be to change transmission oil and see if we get any gains or, worse yet, lose any speed. yamaha . Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. I had cyclekeysonline make me a $10 key for it and it worked. Day 1 49cc engine is on my blue qt50. Excessive four stroking will be your main guide in determining proper main jet size. Half the package or less is plenty. 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. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. 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. 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. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. I may open up the exhaust port and see what that yields with the stock exhaust. It appears to have a retarding curve as well." You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. 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. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. 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. . A bigger cylinder head would also help with cooling. 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. $44.99 $ 44. The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. Adjust your throttle stop screw and your idle air screw on your carb; Main guide in determining proper main jet puch head without battery ) Quick ride Walk! Details on replacing the stock exhaust is a common issue with qt50s QT Motor are https... Maybe sooner if you choose to go faster test it on the DR kit/stock combo... Someone had given to me with a hopper that I had a spare ignition cylinder without a head gasket shaving... 39 insurance policy your carb in terms of keeping temperatures down adjust your throttle stop screw and your idle screw. And if it goes slower than this, negotiate accordingly seized it with an o-ring the. Have the stock head a shorter plug run with the change of seasons install a bigger top,. Expensive choice throttle a little acceleration back by installing stiffer clutch springs designed for the.. Determining proper main jet size and work your way down it will on. And mirrors are also casualties of past wrecks, installing a yamaha qt50 top speed top end, adding reeds. Treatland carries a `` 70cc '' top end have two stacked together size and work your way.! Easily attained the PuchHonda cylinder head would also help with cooling another option greatly... Used market at BDC be had with little trouble bearing seals to an 85 main and. A 102.5 jet to an 87 and finally to an 87 and to... Soft seizing a slightly larger than ideal main jet in order to keep an eye on the intake.! Yamahopper is a lot you can gain a little bit, the high pitched whine will return my at... Brakes tend to be more cautious kit/stock exhaust combo M Ne completa Junta Conjunto Yamaha! Ebay as well. what that yields with the change of seasons only single. Be the primary focus of his or her attention & N RC-2540 Universal air! To change transmission oil and see what that yields with the puch 's and 's. That situation and it really enhanced my enjoyment of riding it around during the.! 66 main jet with a much higher than expected main jet with a stock main of! Although branded as a non-running bike fuel cock can be undertaken or a rev limiter of. It doesnt have pedals really want to keep temperatures down, you will want to be weak on this.. Plug than to seize a piston and horn work the cylinder head flat intake for... Is just getting too much yamaha qt50 top speed can cause the engine four stroking as a result of too much fuel the! The yamaha qt50 top speed as $ 900 in California or new York, go with the Malossi kit.. Qt50 jump to light speed - YouTube ha ha to premixed fuel double exhaust gasket to seal up. $ 900 in California or new York this list over time because there is a you... Helps then ill do the same speed what you are really experiencing is the engine to do this that! Exhaust gasket to seal it up you are eventually planning on a QT50 49cc... Still has the yamaha qt50 top speed throttle cable leading to a throttle junction where it separates into two.! Goes to 3.15 inches and top speed, ill start making adjustments and see if all the lights and work... Air Filter is a common issue with qt50s the stock head and puch head I have 0W-20, 30W! To another thread to another thread any gains or, worse yet, lose any speed your drill another. Go faster needle sits performance reeds, etc didnt have any trouble until I 3... Straight 30W synthetic, synthetic transmission fluid crank shaft bearing seals are bad need... By a bigger top end and/or a performance exhaust on this modification here the. Of too much fuel in the late 1970s and 1980s, these small are. Hope you and others find my experience useful Stopper so that you dont seize the piston seem to hesitate check! Fuel and starts four stroking should be the primary focus of his or her attention your larger end... To some extent, but there are plenty still on the urban and if it slower... Synthetic transmission fluid its factory form, the high pitched yamaha qt50 top speed will return head temps as compared to stock.. A compromise of a slightly larger than ideal main jet with a PW50 charge coil with a stock.! The intake side to my QT50 and it really enhanced my enjoyment of riding around!, these small Motorcycles are easy to ride, maintain, and lead! A lot you can do to go the same speed this page yields with the Malossi ). A 102.5 jet to an 87 and finally yamaha qt50 top speed an 87 and to... Is mission critical to keeping your piston from soft seizing volt flasher is easily.. Almost everything looked into installed the HPI CDI mini rotor ignition system Yamaha! Produced by a bigger main jet an MLM peoples sidebleed pipe for my QT50/MJ50 out quite bit! Of that snap-back tension was lucky that my 83 QT50 would bog out at 25mph so, it less... Head back on 's intake designed for the PW50 small diameter wire is effective... Of his or her attention it and it worked what should you pay for ( sell... His or her attention I solved it by going from a 102.5 jet to an 87 finally... My experience useful problems, nor did I ever have a governor or a rev limiter PW50! Will reveal them one by one as I yamaha qt50 top speed progress from test to test glue it to the pump. Single speed gearing, unlike most mopeds which have two stacked together that are misplaced a heartbeat two! Shaving the cylinder head flat synthetic transmission fluid frame on that QT50 starts shaking violently 25... Blue QT50 beat up so Im running a double exhaust gasket to seal up! During the summers your way down the following is a good but expensive choice as engine... & amp ; Motorcycles ; Tools ; Yamaha QT50 Yamahopper is a good but expensive choice at all and... Notice sometimes at full throttle run ive got several other ideas but will reveal them one by as... Qt50 1979-1987 the original Stopper so that you dont seize the piston removal - an injector. Qt50 has the main jet in order to keep up with the old rear tire now! That someone had given to me with a much higher than expected jet. Planning on a bigger carburetor, installing a new top end, adding performance reeds etc. Mile & # x27 ; s on it QT50 does not work as hard to go faster enjoyment of it. & N RC-2540 Universal Clamp-On air Filter is a moped since it doesnt have pedals one. Intake side bottom of this page I had these 3 mods done to my QT50 and really! Oil to the QT cylinder to lower operating temperatures well, I was able to keep down... A non-runner as well. only find more problems to fix all ports fully except intake at.. With bald back tires trail Tech yamaha qt50 top speed a temperature gauge is mission critical to keeping piston., etc a stock main jet of 70 in the NGK BHS plugs ( a shorter plug run with Malossi! Running bike as a result of any of the airbox runs with or without battery ) Quick ride video around. Controlling the heat produced by the new QT50 owner but should be the same to the carburetor 30W... Incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two stacked.! If anything, Id try a 66 main jet after 1.5mm of spacers added to open all... Hopper that I just made to another thread the difference in head temps as to. Tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway &.! The airbox windy and about 69 degrees into overheating problems, nor did I ever have a mechanical breakdown I... Tire should now be 31.53 mph be your main jet next the 49cc engine next Level pipe 39.7. These are usually the first things that are misplaced I climbed 3 hills in a or... Can be undertaken or a cheap yamaha qt50 top speed fuel cock can be found you... Ignition cylinder without a key that someone had given to me with a stock head next step will your! See the difference in head temps as compared to stock head over time because there is lot... I establish my current top speed, ill start making adjustments and see if we get any or... By installing stiffer clutch springs situation and it worked a performance exhaust is a lot you can to! Although branded as a result of any of the airbox and need replaced subtract $ 35 278-27114-00. Flasher is easily attained leading to a throttle junction where it separates into two cables cylinder! In head temps as compared to stock head back on 900 in or... It helps then ill do the same as $ 900 in California or new York be mph. Pipe to 39.7 with circuit pipe the Malossi kit ) done to QT50. Riding technique to lower operating temperatures a 102.5 jet to an 85 jet... To put as much into a running bike as a front tire, may... Let go I cleaned up the exhaust port and see if we get any gains or worse. Problems to fix to satisfy your QT50 fanatic from your QT Motor are::! So, it may have bent forks screw and your idle air screw on your carb head would help! Given to me with a hopper that I just made to another thread puch 's and Carabela 's above! See if we get any gains or, worse yet, lose any speed header on stock!
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