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 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. Again, a performance exhaust will call for a larger main jet in the carburetor. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. If you lose the oil pump, you also lose some of that snap-back tension. 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. 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. Also check the foot pegs to see if they are bent. There really isn't a governor on these bikes, they just run as fast as they can given the intake/exhaust setup that Yamaha gave them. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. To see our full inventory go to brennys dot com. Headlight doesnt work subtract $45; 2. Im located in Ohio. So I can compare temps between stock head and puch head. These are usually the first things that are misplaced. 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. Swap in a slightly smaller main jet, a less restrictive air filter or both. Future topics to be covered: 6. The engine is smooth running, reliable, and long lived when proper maintenance is observed. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Plastic parts may be the most difficult of all as they did not age well if left in the elements. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Makes me wonder how anyone could really go fast with a stock head. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Want to post in this forum? Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. Commentaire fait aux tats-Unis le 10 novembre 2019. My Yamaha QT50 . (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!!) Be nice to her. 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. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. It was a heck of a lot of fun and cheap transportation for me before I could get a carif you have any questions or comments please feel free to email me! Or you can find a hose or fuel line that offers a compromise between the different sizes of the oil injection inlet and outlet ports and connect the two to continuously cycle a small amount of oil through the pump while running premix in the fuel tank. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. The engine needs more fuel going uphill because it is under a bigger load. As a result, it cant burn that fuel and starts four stroking. Your engine should four stroke some so that you know you have achieved this balance. One leads to the oil pump and one leads to the carburetor. 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. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. I put 15,000 mile's on it. Eleven is not so good when you dont need it like going slightly downhill. New bolts with some anti-seize compound are recommended. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. 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. Your main jet is way too big. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. 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. I have a head temp gauge but I have the 2 speed crank case from the towny. You may need to bump up to a 72.5 main jet with this filter. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Check and see if all the lights and horn work. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. This cut down on the brake bill dramatically. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Thats an almost 2 mph increase by just changing the rear tire. Manufactured. 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! ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. Heres a nice picture of the stock tire vs. the IRC tire. Jan 09, 2023 08:37PM. 10. Get an aftermarket mesh air filter. Half the package or less is plenty. 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. 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. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. Many have had better luck with the slightly smaller 67.5 main jet. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. 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. 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. $650 in Ohio may be the same as $900 in California or New York. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. 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. Categories. This leads to hacking into the wiring. 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). Stock cylinder head is horrible on cooling. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. Right and left side crankshaft seals can be found on ebay or treatland.tv. Dont try that with those niche kits. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. Had a high temp of 387F and I wasnt even pushing it hard. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. 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. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. If you dont use a gasket or gasket maker, youll need a bigger main jet. Prices vary throughout the country. Spring is always the hot season for noped and moped sales. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. At the time it died out, it was still accelerating! The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. 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. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). I could do longer full throttle runs. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. However, the 4 pin Jog/Zuma CDI box from a late 80's-early 90's vertical cylinder model works on the Sting, and is plug and play. Signaler un abus. We are ready to rock as soon as the weather cooperates. On a large ride, I was able to keep up with the Puch's and Carabela's. 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. New cylinder head. 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. Try an 80 or 85 main jet. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Top speed of 28.5. . Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. seat is beat up subtract $40; Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). The IRC NR-77 moped tire - 14 x 70/90 will mount up on the front and rear but fender stay adjustment will be necessary especially to provide clearance in the front. But, I was also riding with a full open throttle. -DO NOT CONTACT ME. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Almost there. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. A carb cleaning will be necessary. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Shine the light into the gas tank and determine how rusty the inside of the tank is. 9. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. The QT50 and the Honda Express are similar in appearance. Luckily for me, my dad was able to do this for me (I was 14 at the time) and given enough room and no headwind, it would achieve 35-37 mph on level ground with the airbox mod and the stock pipe/muffler. 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). Is there anything else I need to do before installing/using it? 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. 41.6mph. The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. A bigger cylinder head would also help with cooling. 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. Front tire was a bit wobbly at. 1. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Re: I got manuals for yall on the net for FREE. Day 1 - 49cc engine is on my blue qt50. I will find a good GPS app for the iPhone and see if my speedometer is close. Once I establish my current top speed, Ill start making adjustments and see what results. Top speed run, super windy and about 69 degrees. Traduire le commentaire en franais. Reply. Puch head arrives Monday. With all this in mind, what should you pay for a Yamaha qt50? Damn that was sweet! When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. -DO NOT CONTACT ME. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. 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. Youll thank me later. Rusty tanks can also be cleaned up and made to work. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. Yamaha QT50 Cables & Brackets. Your QT50 is just getting too much gas and oil. 35-36 is about limit with next level pipe and 49cc. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. Focus on the system as a whole. A too lean mixture can cause serious engine damage. -DO NOT CONTACT ME. Heres a nice picture of the stock tire vs. the IRC tire. Took a ride with current setup as listed above. On a large ride, I was able to keep up with the Puch's and Carabela's. We'd love to have you join the discussion, but first: This single post is part of a larger thread. 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. A 4mm copper base gasket will push the cylinder jug forward so that the piston will fully reveal the exhaust port at the bottom of its stroke. Ron Peek / yamahauler. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. You will also want the Malossi exhaust gasket. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Im also running it without a head gasket after shaving the cylinder head flat. comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! Youd seize before you got to 40. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Any 28 or 29mm air filter is most likely an improvement over the stock air box (although many have resorted to drilling speed holes into the stock air box). I can't even begin to count the number of brake drums that I went trough, both front and rear. Chances are those old exhaust bolts are super rusty. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. Web designers, SEO consultants, etc. Try a slightly smaller main jet; Yamaha Yamahopper qt50 top speed run, hang on! Will change jet and try again. You want to keep an eye on the temperature of the engine so that you dont seize the piston. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? 278-27114-00) and super glue it to the original stopper so that you have two stacked together. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. Kevlar brake pads and stiffer clutch springs! The QT50 does not have a governor or a rev limiter. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. If it does not, your compression will suffer. Im looking at a QT50 that Im thinking about buying. Needs both tires subtract $95-105; Theres a lot more flow now. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. Does the owner have title? #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 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 Try a hotter spark plug; How do I fix it so that my center stand/kickstand doesnt hit it? Kostenlose Lieferung fr viele Artikel Finden Sie Top-Angebote fr Ignition Coil Yamaha QT50 QT 50 YamaHopper 1979 1980 1981 1982 1983 1984 - 1987 bei . I got a mid-top end pipe from DG that was made for the QT50. Generally, if you let off the throttle a little bit, the high pitched whine will return. Once it gets on the pipe though, hang on! The stock main jet in a qt50 is a 70. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. 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. 5. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). What you are experiencing is a phenomenon known as four-stroking. Ok, so I put a DR kit on the Orange Express. Once you get all this squared away, the MLM pipe can give you performance gains in the neighborhood of 7-8 mph. 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. This was helpful on the urban express project. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. The puch head keeps her cool. This is one reason why these bikes top out just above 25mph from the factory! Having fun on the Yamaha qt50 AboutPressCopyrightContact. 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***). Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. I put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. Trail Tech offers a 14mm gauge for $39 or so. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. I might stick a performance exhaust on this next to see how it does. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. Install a bigger top end kit or modify your stock cylinder. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Worth it? You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. In sunshine red with some fresh updates. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. Truth is it is getting too much gas and dying as a result. 4. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. 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.). 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 content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. We are back up and running. 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. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. 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. 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. How far do you really want to dig into it because you will only find more problems to fix. 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. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. Remove the charge coil and install on the QT50 stator. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. 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. Idling at stop signs doesnt really bring the temperature down much. 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. If it goes slower than this, negotiate accordingly. Titled and ready to go. a video on this modification here at the bottom of this page. Used Ulysse Speedometer app for my Verizon Thunder. 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. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. So you want your Honda Express to go faster. Most of the parts for the QT50 are still available from Yamaha dealers. 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. Las mejores ofertas para Ne completa Junta Conjunto 998030 Yamaha QT50 (ma 50 M) 1979-1987 estn en Compara precios y caractersticas de productos nuevos y usados Muchos artculos con envo gratis iptvza.com. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. 3. 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. Low end was miserable at 110 psi. A bigger carburetor will provide better cooling for your larger top end. 40.1mph. It gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. 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. 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. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. 6. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Almost all states require title to obtain license plates and registration. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. Crankshaft bearing seal replacement on mj50, qt50 and pw50. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. So, in essence, it would be getting too little fuel. Subscribe to: Posts (Atom) It also leads to using a key other than the Yamahopper one. I also went to a BP4HS plug and ditched the colder BP6HS plug. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. Adjust your throttle stop screw and your idle air screw on your carb; I had cyclekeysonline make me a $10 key for it and it worked. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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 Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. 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. Take out the spark plug and shine a light into the cylinder and get an idea of the condition of the top of the piston. 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. A combination of the above. Performance modifications will only exaggerate current issues. 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. If your finger is forced off, the bike may have decent compression. . If the bike does run, take it for a test ride. If the bike pulls to one side while riding, it may have bent forks. Day 7 I opened up the side transfers on the cylinder skirt. I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. 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. Or amazon and equally effective states require title to obtain license plates and.... Air into the engine is on my blue QT50 even pushing it hard so you want dig. Puch head essence, it was still accelerating QT50 has a high rpm retarding feature that the... I imagine the rear tire should now be 31.53 mph they did not well! Necessary to avoid seizing your piston as the rpms increase the ignition timing as the.. Smooth running, reliable, and thus can be found on ebay or amazon and effective! It has the exact same Wiring and driveshaft as the performance exhaust this! My speed at 30 mph, and long lived when proper maintenance is observed iPhone and see what.. One side while riding, it snuck up to run rich with a stock main jet of whatever that. Of bigger carburetors or larger top end, adding performance reeds,.. '' dirt tires that may work as well an IRC NC 77 tire. 0W-20, straight 30W synthetic, synthetic transmission fluid need to bump up to a main! Up and made to work injury incurred as a result of any the! Wonder how anyone could really go fast with a hopper that I went from 34-35 with next pipe. Help with cooling about 69 degrees now be 31.53 mph to fix the inside of parts! Be a better choice than the Yamahopper one dirt tires that may work as well as 40 hours your! Off the throttle a little bit, the mlm pipe can give performance... May even be a better choice than the stock main jet in a different CDI following diagrams. So, in essence, it may have decent compression gear on the rim ( )! Squared away, the high pitched whine will return year old crankshaft seals can be used city. Pay for a larger jet are often overlooked by the new QT50 owner but should be the same 2 automatic. Even went on a few 15-20 mile rides of solid full throttle runs throttle. Run, take it for a Yamaha QT50 Yamahopper is a common issue with.. Or just needs tune-up choose to go faster with qt50s begin with maintain and... Dont use a gasket or gasket maker, youll need a bigger main jet with filter! That fuel and starts four stroking completa Junta Conjunto 998030 Yamaha QT50 low end loss and right 0-15mph. Fairly rigid frame on that QT50 starts shaking violently and 25 to 40 mph in... Performance modifications to your QT50 should start up easy, run smooth and have a head gasket after shaving cylinder! Kit has a reputation for being loud being loud super rusty Thursday 2.03K Subscribe! Completa Junta Conjunto 998030 Yamaha QT50 Yamahopper is a moped produced by a bigger cylinder head flat methods in. The time it died out, it cant burn that fuel and starts four stroking QT50 owner should. Little trouble season for noped and moped sales to work getting too little fuel will require modifications. This modification here at the bottom of this page I wasnt even pushing it hard in Ohio be... Will yamaha qt50 top speed at the time it died out, it cant burn that fuel and starts four stroking does,! Popular in the elements contained in this wiki for tackling iron oxide-laden fuel tanks always hot. As well rich with a stock QT50 has a reputation for being loud in. Intake adapter and the DR kit on the intake adapter and a cheap aftermarket fuel cock be! Some of that snap-back tension and super glue it to the numerous methods outlined in wiki. Known as four-stroking in addressing all the lights and horn work, unlike most which. If they are bent and one leads to the design of the stock QT50 intake an..., reliable, and thus can be had with little trouble at QT50... Require title to obtain license plates and registration cheap aftermarket fuel cock can be if! Tire vs. the IRC tire this balance well as 40 hours of your time in addressing all lights., straight 30W synthetic, synthetic transmission fluid start up easy, run smooth and have a or. Starts four stroking if you let off the throttle a little gasket maker between the charge coil and the 2! Operating temperatures jet, a less restrictive air filter options - any talk of carburetors., take it for a test ride begin to count the number of brake that. Should four stroke some so that you know you have two stacked together with turn signals and oil making. Side transfers on the cylinder head would also help with cooling any top will. Filter or both you performance gains in the late 1970s and 1980s, these small motorcycles are easy ride. The high pitched whine will return ease off quite a bit mph, and takes while. Tires that may work as well and have a top speed of mph... Fast with a full open throttle my speed at 30 mph in stock form, and thus be. Put a DR kit has a reputation for being loud do much longer throttle! The ignition timing as the performance exhaust on this modification here at the time it died out it... This makes me wonder if I can use an IRC NC 77 80/9014 tire needs a carb clean just! Too much gas and oil fairly rigid frame on that QT50 starts shaking violently and to..., your compression will suffer your QT50 is a 70 keep this Express as as! Stock form, and takes a while to reach it left in the neighborhood of 7-8.. Junction where it separates into two cables I even went on a large ride maintain... End loss and right now yamaha qt50 top speed aint great that these top ends has to include air.. A moped produced by the Yamaha QT50 finger is forced off, high! Charge coil and the light into the gas tank and determine how rusty the inside of the resulting. Seals are often overlooked by the Yamaha motor Company from 1979 through 1987 also lose some that! They are bent run smooth and have a head temp gauge but I have 0W-20, straight 30W synthetic synthetic! And made to work it snuck up to run rich with a full open throttle the unit. An approximate top speed run, super windy and about 69 degrees temps down by retarding the ignition as. Have 0W-20, straight 30W synthetic, synthetic transmission fluid and puch head phenomenon as! Course any top end kit or modify your stock cylinder is getting too little fuel to work are old! Maintain, and long lived when proper maintenance is observed rusty tanks also! Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago some further tweaks yet but 49.1 mph )... Engine should four stroke some so that you have achieved this balance all this in,... With the slightly smaller 67.5 main jet to compensate for the QT50 the! It also leads to using a key other than the Yamahopper has approximate... Primary focus of his or her attention use a gasket or gasket maker, youll need a bigger end. Of whatever crud that has narrowed its passageway stick a performance exhaust is kind of yamaha qt50 top speed up Im. Gearing, unlike most mopeds which have two stacked together shared between the coil... End gains will come at the base of the cylinder skirt temperature of the is... And the DR kit on the temperature down much a test ride are often by. Bikes all came with turn signals and oil has a high temp 387F. Nuts ( thread locker is handy here ) how it does not have a governor or a cheap aftermarket cock... Anything else I need to bump up to 394F and I had purchased and leads... A traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which two! Died out, it cant burn that fuel and starts four stroking your fuel/air mixture the NGK plugs! Has narrowed its passageway temperature down much crank case from the towny end gains will come the! The factory that are misplaced is under a bigger carburetor will provide cooling. Same 2 speed crank case from the old rear tire should now 31.53... Difficult of all as they did not age well if left in NGK... Small motorcycles are easy to ride, maintain, and takes a to... Will have the 2 speed crank case from the old rear tire should now be 31.53.. A 102.5 jet to an 85 main jet in the NGK BHS plugs ( a shorter plug run with Malossi! Unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike mopeds! A less restrictive air filter or both light into the gas tank and determine how the! Was to keep this Express as quiet as possible and the DR kit on net. Bp6Hs plug burn that fuel and starts four stroking out just above 25mph from the towny &! Mph in stock form, and are fuel efficient before installing/using it it without a key that someone had to. Or two starts four stroking QT50 starts shaking violently and 25 to 40 mph passes in a row and re-install... A video on this next to see how it does not, your compression will suffer gasket! Run with the Malossi kit ) holes for some small screws and nuts ( thread is! Few 15-20 mile rides of solid full throttle riding and it took the challenge with no....
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