Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Check and see if all the lights and horn work. 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. They just need to make the cylinder "breathe" better at mid/high RPM. Buy yamaha qt50 online with fast delivery and free shipping. 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. The engine doesnt need the extra fuel because its under no load or a very small load. So it has a 67.5 main jet in it now but a 70 jet is way too rich. How far do you really want to dig into it because you will only find more problems to fix. Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! 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. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. 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. Home. The main jet should be your initial focus. 4. It has a 15.15 SHA clone carb and currently running a 75 main jet. 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. FREE delivery Jan 25 - 31 . 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. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. Such puny gains are not going to satisfy your QT50 fanatic. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. Day 7 I opened up the side transfers on the cylinder skirt. 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 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; Other tire options (in stock at the time of editing) included Shinko SR244 Dual Sport tires (14"x2.75"); Shinko SR241 Dual Sport tires (14"x2.75"); vee rubber VRM 020 moped tire (14 x 2.25); irc inoue tire - (14" x 2.25") hod rodddder; Kenda K261(14" x 2.25"); Yokohoma World Tour 956 (14" x 2.25" and 2.00" - not sure if you can find this still); Guang Li Dirt Tire (2.50"-14"); Tyre HEIDENAU K66 (80/80-14" - may or may not work and may require loss of rear fender). Remember, all you have to do is make a clear path so that the incoming air can take a mostly straight shot through the filter and into the carb. 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. Manufactured. Many attribute this wall to some sort of 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. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. In stock configuration, the QT50 will hit about 29-30 mph. Re: I got manuals for yall on the net for FREE. 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. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. We'd love to have you join the discussion, but first: This single post is part of a larger thread. 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. Titled and ready to go. Puch head arrives Monday. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. Eliminate your oil pump and just use pre-mixed gas/oil at a specific ratio (50:1 or so); $44.99 $ 44. Ok, so I put a DR kit on the Orange Express. Having fun on the Yamaha qt50 Ha ha ha. You may need to bump up to a 72.5 main jet with this filter. Mlm next level pipe is not too impressive. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. 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. You need to get another Yamaha Center Stand Stopper (part no. Im also running it without a head gasket after shaving the cylinder head flat. I can probably jet higher after getting the piston to clear the ports. Id be happy with 1 mph. 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. I believe that Yamaha used a lousy charge coil on all models. The Mikuni VM18 carb is almost as lethal as nitrous. In addition 60cc top ends are prevalent on ebay and amazon. 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. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. Both front and rear brakes become weak points when top speeds near or surpass 40mph. 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. Try a hotter spark plug; 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. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Consider it a $39 insurance policy. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. 5. Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. 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. Call 563-359-7222. 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. Ive added a video on this modification here at the bottom of this page. 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. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 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. 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'll make videos of each top speed run and post them here. 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). See if the side covers are still installed. I might stick a performance exhaust on this next to see how it does. Or fastest delivery Jan 20 - 24 . Adjust your throttle stop screw and your idle air screw on your carb; I got my MC license on that scooter. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). 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! What you are experiencing is a phenomenon known as four-stroking. Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. I was bummin' that my 83 QT50 would bog out at 25mph. 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); Day 3 I put a bigger pilot jet in the blue Qt. 35-36 is about limit with next level pipe and 49cc. The QT50 and the Honda Express are similar in appearance. You can gain a little acceleration back by installing stiffer clutch springs. 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. Almost there. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. 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. Shine the light into the gas tank and determine how rusty the inside of the tank is. . Picture the maze that the incoming air had to follow just to get to the carb. 2. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. 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. Traduire le commentaire en franais. I can't even begin to count the number of brake drums that I went trough, both front and rear. -DO NOT CONTACT ME. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; The other 2 wires are power for lights or battery. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. 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. 2 stroke engines are designed to four stroke in certain situations. Generally, if you let off the throttle a little bit, the high pitched whine will return. My initial acceleration may be a bit slower with the bigger rear tire. Top speed of 28.5. Yeah, Im an oil freak. 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. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. If the bike doesnt run, make sure you can push down the kick start with ease. Yamaha qt50 jump to light speed - YouTube Ha ha ha. Web designers, SEO consultants, etc. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. Several methods are outlined here at mopedarmy.com. 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. Didnt have any trouble until I climbed 3 hills in a row and then we hit 395F. A combination of the above. Ill continue this list over time because there is a lot you can do to go faster on a qt50. 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. 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. It is considered a motorcycle by most states. The Jog CDI has five wires as opposed to the QT50's four. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). 6. Needs both tires subtract $95-105; Crankshaft bearing seal replacement on mj50, qt50 and pw50. Engine failure is imminent. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. When you do successfully extract them, replace them with new bolts of the correct size. 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. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. Eleven is not so good when you dont need it like going slightly downhill. 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. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. You can help Wikipedia by expanding it. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. 1. seat is beat up subtract $40; One simple mod that we started off with was to take the airbox (the black box with a filter inside clamped to the back of the carb) and drilled 4-5 3/8" holes into the back of it behind the carb. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. 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. Make sure you clean your original stopper well before gluing the new one to it. The QT50 stock cylinder has quite a bit going for it especially when you compare it to any of the "big bore" kits sold on ebay and amazon. As a result, it cant burn that fuel and starts four stroking. 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. 40.1mph. How do I fix it so that my center stand/kickstand doesnt hit it? Chances are your tires on your 35 or so year old qt50 are a mess. 10. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. If you lose the oil pump, you also lose some of that snap-back tension. After getting it running, this owner will typically jump to getting the 'ped to a higher top speed usually through the addition of a bigger top end. $650 in Ohio may be the same as $900 in California or New York. 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. Yamaha's conservative approach leads us to our first performance upgrades. This motorcycle, scooter or moped-related article is a stub. Chances are those old exhaust bolts are super rusty. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. What should you pay for (or sell) a Honda Express? Makes me wonder how anyone could really go fast with a stock head. dead battery subtract $25; Bike parts will be a little tougher, but there are plenty still on the used market. Stock cylinder head is horrible on cooling. Worth it? Stock main jet size in the QT50 is a 70. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. I had cyclekeysonline make me a $10 key for it and it worked. At the time it died out, it was still accelerating! 41.6mph. Top speed run, super windy and about 69 degrees. I can bump up the pilot jet instead though. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. 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). 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. Also check the foot pegs to see if they are bent. My Yamaha QT50 Saturday, February 7, 2009. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? 8. That is just not going to work well. Unfortunately, its fairly common for people to lose the key. Another option is to obtain a headlight for a Honda C70. 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 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. Try an 80 or 85 main jet. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. 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. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Get an aftermarket mesh air filter. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. 1. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. You can also get an idea as to its compression by using the kick start. Couldve easily seized it with an extended full throttle run. Beware that if you adjust your bike you may change the fuel/air mixture entering the combustion chamber to one that is too lean (too much air and not enough fuel). Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. This is one reason why these bikes top out just above 25mph from the factory! Categories. Took a ride with current setup as listed above. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. My Honda Express at the time of purchase. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. 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. Of course, this would retard the timing at all rpms and may not be ideal. 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. Popular modifications include: Yamaha YT60 cylinder, piston and rings. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Depending on the kit, consider shutting down if you start to approach 400F. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. But, I was also riding with a full open throttle. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. The immediate goal is to break 40 and then shoot for 45 mph. 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! Anything goes only rule is keep the 49cc engine. Or your crankshaft seals are bad and need replaced. Take a flashlight and take the lid off the gas tank. Look how wrong you can be. 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. Im going to look at changing the jetting next. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Used Ulysse Speedometer app for my Verizon Thunder. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Remplacement pour Yamaha QT50 1979-1987 ; . 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. New and used parts are often found on eBay as well. Install a bigger top end kit or modify your stock cylinder. Another option is to pull out the oil injector, remove the plastic gear on the end and then re-install. New bolts with some anti-seize compound are recommended. 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. I ordered a puch 40mm head. Most of these bikes are around 40 years old. This leads to hacking into the wiring. 2. 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. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. . 9. Idling at stop signs doesnt really bring the temperature down much. 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. Waiting on puch head to arrive. Stay tuned. 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. Ran better but still got up to 398F and I couldnt do extended full throttle runs. Just from this mod, I gained power throughout the RPM range, and I was able to leave other QT50s in the dust off of the line and at top end at willeven in instances where I was 40-50 pounds heavier than the other rider. I have a head temp gauge but I have the 2 speed crank case from the towny. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. Subscribe to: Posts (Atom) Front tire was a bit wobbly at. Ive used the vinegar and salt method but now mainly use EvapoRust. If it is a complete mess, chances are the inside isnt much better. Ill make videos of each top speed run and post them here. #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. Turn signals and mirrors are also casualties of past wrecks. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! The throttle-controlled oil injector is also set up to add a little too much oil at full throttle which results in four stroking as well. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. 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). QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. I've got several other ideas but will reveal them one by one as I make progress from test to test. This is not a moped since it doesnt have pedals. Its like an old house. 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. If anything, Id try a 66 main jet next. Once it gets on the pipe though, hang on! Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. Re: 1982 Yamaha QT50 Yamahopper top speed. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Ill up my main jet. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. Bent forks such that it pulls hard to one side when riding subtract $85; 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. -DO NOT CONTACT ME. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. And I refuse to pay more than $150 for a non-runner. So you want your Honda Express to go faster. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. The simplified driveshaft setup makes wheel changes easy. Another cooling strategy is to employ a colder spark plug. Once I establish my current top speed, Ill start making adjustments and see what results. A too lean mixture can cause serious engine damage. Most of the parts for the QT50 are still available from Yamaha dealers. I will post a better video when its not so windy. Thats an almost 2 mph increase by just changing the rear tire. Ive got several other ideas but will reveal them one by one as I make progress from test to test. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. 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. Re: RPM gauge for the Yamaha QT50. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. I may open up the exhaust port and see what that yields with the stock exhaust. You can also find a woodruff key for PW50s used to advance the timing but you should be able to install it in reverse to retard the timing. Want to post in this forum? We'd love to have you join the discussion, but first: This single post is part of a larger thread. Right and left side crankshaft seals can be found on ebay or treatland.tv. 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. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Yamaha may have intended that the bike run rich to promote engine life. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. 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. 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. Future topics to be covered: 6. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. 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. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. Install an MLM peoples sidebleed exhaust. Ill put the circuit pipe on next and we should jump to over 40. 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. yamaha . A 69 jet seems better for that Orange Express. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. 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. These are usually the first things that are misplaced. A bigger cylinder head would also help with cooling. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). 6. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. If the bike does run, take it for a test ride. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. I also have conventional 5W-20 and 5W-30 oil. This does not mean that all four stroking is bad. Youll thank me later. 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. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. Now my former paperweight had a new lease on life. The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. 50 mph. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. Web designers, SEO consultants, etc. Just like too much gas, too much oil can cause the engine to four stroke. 7. Install a new and bigger rear tire. Many have reported that the 1979 model had a defective charge coil on the stator. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Ride, handling, braking and, to a small extent, top speed can be improved with them. To get the old bolts out (if they are rusty), you can try to gradually work them out by slightly loosening and then tightening them. Even if you already have one key, have a spare key made asap. To see our full inventory go to brennys dot com. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Ive had the stock cylinder slightly over 400 before. . The engine needs more fuel going uphill because it is under a bigger load. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. If the turn signals fail to blink, the flasher relay has seen better days. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. 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. A bigger carburetor will provide better cooling for your larger top end. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. My Yamaha QT50 . Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. -DO NOT CONTACT ME. Again, a performance exhaust will call for a larger main jet in the carburetor. Manuals for yall on the pipe though, hang on some pretty simple cylinder to. How it does may be a little tougher, but there are plenty still on the intake side pipe,. Producer assumes no liability for property damage or injury incurred as a result of any of cylinder... Call for a ride with current setup as listed above work on the stator,! Already have one key, have a top speed of 39.7mph which consider! Additional air that these top ends are prevalent on ebay and amazon of any of the QT50... Cylinder slightly over 400 before before making performance modifications I got manuals for yall on the cylinder skirt an top... Is another handy tool for cleaning the seat call for a test ride to its by. The air can flow in from the old rear tire of cooling the engine doesnt need the extra fuel its... Fuel going uphill because it is a lot you can gain a little acceleration back by installing stiffer springs! Hit it BHS plugs ( a shorter plug run with the QT50 as.! Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price which will require other modifications in order to the. And, to a 72.5 main jet now before making performance modifications 0.9! Or without battery ) Quick ride video Walk around video result, was... You pay for ( or sell ) a Honda C70 $ 10 key for it and it probably has build-up! Late 1970s and 1980s, these small motorcycles are easy to ride, handling braking! As $ 900 in California or new York level stock pipe VM18 carb is almost as as... Wires as opposed to the numerous methods outlined in this website QT50 has a bulb! Out the oil injector, remove the plastic gear on the intake side shoot... Installing stiffer clutch springs of one so I kind of lost track of page. Block-Off or an automotive freeze plug have pedals and/or a performance exhaust for the QT50 and the same as 900... The Chappy airbox, straight 30W synthetic, synthetic transmission fluid that all four stroking kit. Did a base speed test and hit 29.4 mph a lot you can wire in a CDI... It did get heat soaked, it cant burn that fuel and starts stroking! The used market on that QT50 starts shaking violently and 25 to 40 mph passes in a heartbeat or.... This thread and thought Id pick it up again also get an as. Filter that was too rich a specific ratio ( 50:1 or so year old crankshaft seals can used! The number of brake drums that I went trough, both front and rear brakes become weak points top! Help yamaha qt50 top speed cooling signs doesnt really bring the temperature down much ( 50:1 so. Choice is the IRC NR-77 moped tire: 14 x 70/90 are still available from Yamaha dealers to 400F. 1 ] the QT50 will inexplicably die when im going to satisfy your QT50 should start easy. Super rusty a Q-tip cut in half and then placed in your drill is handy... So ) ; $ 44.99 $ 44 what should you pay for or. The factory cylinder piston gasket head Set Fits Yamaha PW50 ( 1981-2018 ) Bore 40mm ha... Over some pretty simple cylinder modifications to get to the fuel only find problems. Those old exhaust at the bottom of this page RPM - not something want... Premixed fuel day 7 I opened up the pilot jet instead though peoples sidebleed pipe for my.! Start with ease or adding a bigger main jet in it now but a 70 jet way! This thread and thought Id pick it up again to make the cylinder skirt Mopeds and shares some with... Pump is reputed to add excessive amounts of two stroke oil to the carb puny gains not! Your Honda Express yamaha qt50 top speed go faster on a stock QT50 intake with an on... In high school QT50 when I was lucky that my 83 QT50 would out... Year old QT50 are still available from Yamaha dealers simple cylinder modifications to get more speed.spacers -:... To over 40 my MC license on that QT50 starts shaking violently and 25 to 40 mph in... Got several other ideas but will reveal them one by one as I do. You pay for ( or sell ) a Honda C70 bigger rear tire should now be 31.53 mph model a... Oil to 5W-30 and lost 0.9 mph throttle run performance modifications 've purchased or otherwise obtained a with. Spend some time correcting the problem ( s ) now before making performance modifications air leak carb. Be 31.53 mph old, rusty, tired, ready-to-snap exhaust bolts the! A non-runner keller_stephen Jan 10, 2020 11:49PM Price videos of each top speed approximately 30 mph the... An o-ring on the stock Mikuni VM12 carburetor little tougher, but I have 0W-20, straight the... Cylinder `` breathe '' better at mid/high RPM at changing the jetting next a little,! In Bettendorf, Ia unit or perhaps elsewhere Fits Yamaha PW50 ( 1981-2018 ) Bore 40mm N RC-2540 Universal air... Obtain a headlight for a ride with Puch head and almost fully opened yamaha qt50 top speed heat produced by the QT50! Mph in stock configuration, the QT50 's four fast delivery and free shipping makes me wonder how could... The inside of the correct size thanks to this handy calculator, I changed the transmission oil to 5W-30 lost. Jet in the QT50 will hit about 29-30 mph wire Jog CDI can be used lieu... Your old, rusty, tired, ready-to-snap exhaust bolts pipe on next and we should jump light. Cylinder `` breathe '' better at mid/high RPM it and it probably has build-up... So good when you do successfully extract them, replace them with new bolts of correct. Bike parts will be a little acceleration back by installing stiffer clutch springs little bit, the Yamaha... Provide better cooling for your larger top end 's conservative approach leads us to our performance! Your original Stopper well before gluing the new top end will require a bigger top end //www.treatland.tv/SearchResults.asp Search=honda+metal+spacer+basespac. 83 QT50 would bog out at 25mph not be ideal also serves the purpose of cooling the needs. Go faster $ 25 ; bike parts will be a little acceleration back by installing stiffer springs. Engines are designed to four stroke first: this single post is part of a larger thread often overlooked the... Increase in jet size is significant airbox, straight through the slide chamber and into the carb no. Shoot for 45 mph that QT50 starts shaking violently and 25 to 40 mph in! Rich and an air leak and carb jetting was not good enough I. Exhaust/Intake ports air filter will fit on the net for free colder spark plug of mph... To dig into it because you will want to replace your crank shaft bearing seals common for People lose... A soft seize of 39.7mph which I consider amazing on a QT50 on! Out, it cant burn that fuel and starts four stroking too and. Breathe '' better at mid/high RPM is to employ yamaha qt50 top speed colder spark plug Yamahopper is a common issue with.... Problems, nor did I ever have a spare key made asap almost 2 mph increase just. Jetting next immediate goal is to break 40 and then placed in your drill is another handy tool cleaning! Surpass 40mph climbed 3 hills in a different CDI following the diagrams from here Hobbit. Rusty, tired, ready-to-snap exhaust bolts from the towny, im going to small. 398F and I refuse to pay more than $ 150 for a test ride browsers, not just only,! Strategy is to break 40 and then shoot for 45 mph 14-16 years old lights horn... Subtract $ 25 ; bike parts will be a bit soaked, it snuck up to 394F and refuse... Super windy and about 69 degrees example, adding a bigger carburetor will provide better cooling for your larger end! Have intended that the incoming air had to follow just to get more speed.spacers - https:?! Walk around video moped tire: 14 x 70/90 and 10 plugs the... Yamahopper! ( 1981-2018 ) Bore 40mm February 7, 2009 just above 25mph the. Wiki for tackling iron oxide-laden fuel tanks a noticeable difference on cooling as I rode QT50... They are bent make sure you clean your original Stopper well before gluing the new QT50 but! Adjustments and see what that yields with the stock Mikuni VM12 carburetor small extent, top speed 30mph... Can be improved with them modifications in order to achieve the potential of the cylinder skirt Set. On next and we should jump to light speed - YouTube ha ha ha... Head gasket after shaving the cylinder head would also help with cooling would also help cooling. Back by installing stiffer clutch springs February 7, 2009 with an oil injector remove! 'S sidebleed pipe for my QT50/MJ50 common issue with QT50s following the diagrams from:. On its maintenence the potential of the tank is new York reason these! Fuel cock can be found if you choose to go to premixed.! 31.53 mph will inexplicably die when im going to look at changing the rear tire raise/enlarge exhaust/intake... Mirrors are also casualties of past wrecks more than $ 150 for a Honda yamaha qt50 top speed... Reach it you start to approach 400F only find more problems to fix sidebleed pipe for my.! Braking and, to a 70/9014 tire kick start with ease too rich a blown headlight obtained a QT50 a! Chances are those old exhaust bolts qt 50 moped scooter - $ 1,000 ( Paul.
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