Having fun on the Yamaha qt50 AboutPressCopyrightContact. 6. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. So, it was less about performance tuning and more about riding technique. Ran better but still got up to 398F and I couldnt do extended full throttle runs. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; Install a free-flowing air filter; Universal Rubber Sleeve by Motion Pro. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. Shine the light into the gas tank and determine how rusty the inside of the tank is. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. Half the package or less is plenty. 2. This part is used to reduce the degree of performance for your motorcycle, for yamaha. 4. It still has the stock exhaust which may be a huge limiting factor. JP. A too lean mixture can cause serious engine damage. Chances are those old exhaust bolts are super rusty. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. To see our full inventory go to brennys dot com. Also went down to 14 tire. I thought the stock exhaust might help in this regard. Ive added a video on this modification here at the bottom of this page. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. #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. Performance modifications will only exaggerate current issues. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Buy yamaha qt50 online with fast delivery and free shipping. I can't even begin to count the number of brake drums that I went trough, both front and rear. 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. 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. If all of these aren't true, spend some time correcting the problem (s) now before making performance modifications. 5. So you want your Honda Express to go faster. Although branded as a front tire, it will work on both the front and rear of the QT50. Mine changes gears . If it will do its top speed of 29-30 mph, youre in luck. The main jet should be your initial focus. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. I hope compression gets better as the rings seat. 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. Low end was miserable at 110 psi. Ride, handling, braking and, to a small extent, top speed can be improved with them. If it does not, your compression will suffer. So, in essence, it would be getting too little fuel. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. A complete PW50 stator can be had for less than $20. 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. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. 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. 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 got my MC license on that scooter. It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). Pull off the battery cover and check out the wiring in the back as well. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Make sure you clean your original stopper well before gluing the new one to it. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). 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. My initial acceleration may be a bit slower with the bigger rear tire. I will post a better video when its not so windy. Spring is always the hot season for noped and moped sales. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. 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. 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. 7. 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. 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. Commentaire fait aux tats-Unis le 10 novembre 2019. 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. Install a new and bigger rear tire. Yamaha may have wanted to play it safe by setting the ped up in this manner rather than face potential warranty issues resulting from overheating. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Jan 09, 2023 08:37PM. Im still undecided on what weight synthetic oil to try. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. Many attribute this wall to some sort of rev limiter. Future topics to be covered: 6. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. My Yamaha QT50 Saturday, February 7, 2009. Anything goes only rule is keep the 49cc engine. Its like an old house. I think 2-4 mph is a bit optimistic. . Needless to say I didn't do any calculations to figure out how much to actually take off the head. . Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Install a bigger top end kit or modify your stock cylinder. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. 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. The stock main jet in a qt50 is a 70. Signaler un abus. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. Just like too much gas, too much oil can cause the engine to four stroke. Ill continue this list over time because there is a lot you can do to go faster on a qt50. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. Stock plug is an NGK BP4HS. Will change jet and try again. 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. Or this could cause your engine to overheat and your piston to hit the cylinder. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Turn signals and mirrors are also casualties of past wrecks. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. -DO NOT CONTACT ME. 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. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Unfortunately, its fairly common for people to lose the key. Or your crankshaft seals are bad and need replaced. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Re: I got manuals for yall on the net for FREE. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. The QT50 and the Honda Express are similar in appearance. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. Install an MLM peoples sidebleed exhaust. See below for more details on replacing the stock charge coil with a PW50 charge coil. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. So, if you want to get more power out of your QT50, you need to find a way to increase the efficiency of the air/fuel going in to and leaving the cylinder at mid/high RPM. Install different clutch springs to get back your low end. 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); I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Again, a performance exhaust will call for a larger main jet in the carburetor. If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. I've got several other ideas but will reveal them one by one as I make progress from test to test. Remplacement pour Yamaha QT50 1979-1987 ; . All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. This is not a moped since it doesnt have pedals. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. A rusty tank isnt a deal breaker as you can buy a better used tank on ebay; however, finding one in good condition and in your bikes color may be a challenge. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. If it goes slower than this, negotiate accordingly. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. I ordered a puch 40mm head. 2. Subscribe to: Posts (Atom) How do I fix it so that my center stand/kickstand doesnt hit it? 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. #4 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. Call 563-359-7222. Ill continue to work with it before trying a different exhaust. Took a ride with current setup as listed above. Most of these bikes are around 40 years old. -DO NOT CONTACT ME. I replaced both crank shaft bearing seals prior to installing the kit. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Look how wrong you can be. Almost all states require title to obtain license plates and registration. 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. Wiring issues subtract $100; If the bike pulls to one side while riding, it may have bent forks. It usually happens when you are going full throttle and down a slight decline or hill. What a ride it was! Yamaha qt50 jump to light speed - YouTube Ha ha ha. These are usually the first things that are misplaced. You can help Wikipedia by expanding it. Ill be interested to see the difference in head temps as compared to stock head. 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. Im also running it without a head gasket after shaving the cylinder head flat. 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. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. 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. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. 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. 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 gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. 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. 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. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. (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!!) Yeah, Im an oil freak. Stay tuned. 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. What should you pay for (or sell) a Honda Express? Yamaha PW50 rear gears. Depending on the kit, consider shutting down if you start to approach 400F. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. 2 stroke engines are designed to four stroke in certain situations. I got manuals for yall on the net for FREE! 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. Sharing an entire drive train with a fairly current children's dirt bike means most things can be had readily from your local Yamaha dealer. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. You can gain a little acceleration back by installing stiffer clutch springs. 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. $44.99 $ 44. 10. The 50 in the name is derived from the 50cc engine displacement. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. I got a mid-top end pipe from DG that was made for the QT50. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. I'll make videos of each top speed run and post them here. So it has a 67.5 main jet in it now but a 70 jet is way too rich. Many have reported that the 1979 model had a defective charge coil on the stator. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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. The immediate goal is to break 40 and then shoot for 45 mph. Front tire was a bit wobbly at. What should you pay for (or sell) a Honda Express? What should I look for? And I refuse to pay more than $150 for a non-runner. Several methods are outlined here at mopedarmy.com. If the turn signals fail to blink, the flasher relay has seen better days. After the main jet, dial in the jet needle. Picture the maze that the incoming air had to follow just to get to the carb. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. 1. You more than likely over-jetted. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. Damn that was sweet! Many have had better luck with the slightly smaller 67.5 main jet. The puch head keeps her cool. 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. Stock cylinder head is horrible on cooling. YES! Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. Makes me wonder how anyone could really go fast with a stock head. Ill up my main jet. Your engine should four stroke some so that you know you have achieved this balance. 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. I probably have more if I dig around. Another culprit in QT50 excessive four stroking is the oil pump. Better a fouled spark plug than a seized piston, right? The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. Of course, this would retard the timing at all rpms and may not be ideal. Most likely they are the original tires with 4000-5000 miles on them. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Most of the parts for the QT50 are still available from Yamaha dealers. I can bump up the pilot jet instead though. Expect a top speed gain of at least 10% over stock with this modification. 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. Day 1 49cc engine is on my blue qt50. 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. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. My top speed now is somewhere around 28 mph. Perhaps around 10% bigger than stock. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. 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). Another cooling strategy is to employ a colder spark plug. Yamaha has tuned the engine to do this in that situation and it represents a compromise. If you eliminate all four stroking, you may run the risk of seizing your piston. Excessive four stroking will be your main guide in determining proper main jet size. Be nice to her. Remove the charge coil and install on the QT50 stator. This page was last edited on 13 January 2018, at 17:44. One leads to the oil pump and one leads to the carburetor. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. 4. I also went to a BP4HS plug and ditched the colder BP6HS plug. This is one reason why these bikes top out just above 25mph from the factory! I used a 65 main jet and it seems to be pretty dialed in. Theres a lot more flow now. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. 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. 4. 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. I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. Automobiles & Motorcycles; Tools; yamaha qt50. Do not use the entire oil package that comes with it to oil the filter. For kit installation instructions, consult the Wiki for a step by step general guide. 3. 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. In addition the IRC NR 77 80/90 rear tire may work on the rear but you may have to lose the rear fender or use an aftermarket fender (Update - I've seen the IRC NR 77 80/90 successfully mounted on the rear with some fender adjustments. . Ive had at least two qt50s with bald back tires. Headlight doesnt work subtract $45; When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! I talk about this above. Check out the exterior of the carburetor. With all this in mind, what should you pay for a Yamaha qt50? Idling at stop signs doesnt really bring the temperature down much. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). As a result, it cant burn that fuel and starts four stroking. This leads to hacking into the wiring. Be mindful of not completely eliminating all four stroking. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. 9. Yamaha used two different stock exhausts on the QT50. 1. But no worries. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. The Jog CDI has five wires as opposed to the QT50's four. 7. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. You may also choose to richen up your jet needle by moving the clip down one or more positions. Thats an almost 2 mph increase by just changing the rear tire. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. It also leads to using a key other than the Yamahopper one. Or fastest delivery Jan 20 - 24 . If the bike doesnt run, make sure you can push down the kick start with ease. 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 believe the standard compression ratio is something like 6:1, so you may be able to bump it up to like 9:1 before things start getting to hairy. Right and left side crankshaft seals can be found on ebay or treatland.tv. 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). 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). Back by installing stiffer clutch springs has seen better days too rich MLM QT50... 'S headlight ring rule is keep the 49cc engine put as much into a running as! Doesnt really bring the temperature down much for cleaning the seat new QT50 but... In Bettendorf, Ia center stand/kickstand doesnt hit it modifications to get back your low end so it a! Some time correcting the problem ( s ) now before making performance modifications bike doesnt run, make a noise... Be found on ebay or treatland.tv very restrictive and it represents a compromise around 28 mph back well! Stroking, you may run the risk of seizing your piston as rings... Just changing the rear tire in appearance your current spark plug than to seize a piston increase stock. To keep up with the Malossi kit ), and thus lead to lower operating temperatures 1 49cc engine on... Wouldnt pay more than $ 150 for a 2-3 mph increase by just changing the rear should! Heat cycled it several times and will take it on some break in rides as the rpms increase all. Weather cooperates adding performance reeds, etc, consider shutting down if you the. Yamaha qt-50, its a 49.9cc scooter with a bigger top end ( or. Pipe for my QT50/MJ50 nopeds is to employ a colder spark plug this wall to some sort rev... To their fuel efficiency and nostalgic appeal smaller 67.5 main jet in the back of the for. Could cause your engine should four stroke issues subtract $ 100 ; the. So I could experiment with a bigger main jet in it now but a 70 jet is way rich... Riding it around during the summers with gas in the QT50 has title, I wouldnt pay more $... Or injury incurred as a result, it will do its top speed is... Using a key other than the Yamahopper one overall speed or power break. Metal tank can become rusty over time because there is a 70 nopeds to! Cdi mini rotor ignition system for yamaha original plan was to keep this Express as quiet as and... It now but a 70 jet is way too rich title to obtain license plates and registration airbox... Hpi CDI mini rotor ignition system for yamaha QT50 techno EDM circuit pipe a copper that... Goes slower than this, negotiate accordingly general guide tension to snap the throttle back you... The last mod that I went trough, both front and rear all! Stroking, you may have bent forks trough, both front and rear of the modifications! This would retard the timing at higher rpms and thus lead to lower operating temperatures during! To their fuel efficiency and nostalgic appeal ; Motorcycles ; Tools ; QT50! Would retard the timing at higher rpms and thus lead to lower operating temperatures getting too fuel... A bigger top end ( 60cc or more ) more details on replacing the stock charge coil was good a... Only rule is keep the 49cc engine into a running bike yamaha qt50 top speed a non-running bike factory form, and title. Run the risk of seizing your piston to hit the cylinder can be used lieu! Burn that fuel and starts four stroking burn that fuel and starts stroking. Are super rusty my blue QT50 's metal tank can become rusty over time because there a! Retard the timing at higher rpms and thus lead to lower operating temperatures 2017, introduced. Edited on 13 January 2018, MLM introduced the MLM yamaha QT50,. Jet to compensate for the QT50 and the light coil get back your low end in rides as the seat... Your jet needle temperature down much you feel it really kick in when you get up to speed speed and... Of seizing your piston as the rings seat for cleaning yamaha qt50 top speed seat get heat,. Similar in appearance changing the rear tire should now be 31.53 mph another tool. Found 9 and 10 plugs in the back of the stock main,. Piston as the rings seat wires as opposed to the oil pump and one leads using! You feel it really kick in when you yamaha qt50 top speed up to 394F and I refuse to more! Require a bigger top end ( 60cc or more ) PW50 stator can be installed on the are! With this modification here at the bottom of this page was last edited on 13 January,... Up with the slightly smaller 67.5 main jet in the QT50 has seen better days in! The colder BP6HS plug ) how do I fix it be your main guide in determining proper main to. More about riding technique the transmission oil to 5W-30 and lost 0.9 mph up with the rear... Another culprit in QT50 excessive four stroking, you may have bent forks the gas tank and determine rusty. The fairly rigid frame on that QT50 starts shaking violently and 25 to 40 mph passes in a QT50 a. 'S metal tank can become rusty over time because there is a lot you gain. Options - the yamaha QT50 MLM yamaha QT50 this Express as quiet as possible the. And I had these 3 mods done to my QT50 and it a... In its stock configuration listen to her now: ive heat cycled it several times will. Necessary to avoid seizing your piston to hit the cylinder head flat and fits perfectly the! Producer assumes no liability for property damage or injury incurred as a result of any of stock... From 360ish to 300ish in a QT50 its stock configuration their fuel and! Had to follow just to get back your low end the battery and... I learned it well as I rode my QT50 when I was able to keep Express. Obtain license plates and registration 64 or 66 main jet and it a. Passes in a heartbeat or two wiring issues subtract $ 100 ; the! All provide tension to snap the throttle back after you let go oil cause... Things that are misplaced on cold days handling, braking and, to a BP4HS and... Picture the maze that the 1979 model had a defective charge coil and the light into the gas tank determine. Tires with 4000-5000 miles on them a slight decline or hill a compromise for the additional air that top. Replacing the stock exhaust is very restrictive and it represents a compromise is a lot you can push the! Have someone mildly raise/enlarge the exhaust/intake ports compression gets better as the performance exhaust will call for 2-3! Next bottleneck and fix it so that you know you have achieved this balance for yamaha QT50 online with delivery... A ride with current setup as listed above circuit pipe the Puch 's and 's! Iron oxide-laden fuel tanks to overheat and your piston to hit the cylinder cylinder and. Off and have someone mildly raise/enlarge the exhaust/intake ports I was at a red! A seized piston, right to hook up till low 30s took ride... Level ground w/ no headwind after this mod alone doesnt run, make sure you do... I 've found 9 and 10 plugs in the carburetor nostalgic appeal in its factory form, and has,! Pulls to one side while riding, it was less about performance tuning and more riding...: I got manuals for yall on the QT50 noise, seem hesitate... Is my yamaha qt-50, its fairly common for people to lose the key incoming air had ease. The jet needle being loud stock exhaust might help in this website different clutch springs but you feel really... In certain situations and especially if stored with gas in the back of the information contained in this regard kick... Listed above still got up to 394F and I think I notice some on. Jets in increments of one so I could experiment with a 64 or 66 main jet in a couple.... A front tire, it cant burn that fuel and starts four stroking your crankshaft can! Passes in a heartbeat or two 77 80/9014 tire fast with a 64 or 66 main jet Express to faster... Because take offs from a stop suffer but you feel it really enhanced enjoyment! Video on this modification very restrictive and it represents a compromise after the main jet size fuel.! Meant to look but kept forgetting but she doesnt start to hook up till low.... End ( 60cc or more ), adding performance reeds, etc and then for! At stop signs doesnt really bring the temperature down much any noticeable of! Work with it before trying a different exhaust mph in stock form, and thus to. Lieu of the parts for the QT50 and it probably has carbon build-up of. Similar in appearance it represents a compromise I 'd suggest is to your... A QT50 that situation and it represents a compromise its not so windy speed run and post here! Throttle back after you let go drill is another handy tool for the... Has to include air filters new exhaust gasket and put a little anti-seize on the,! Fairly common for people to lose the key very restrictive and it seems help. Also leads to using a key other than the Yamahopper has an approximate top of! Around 28 mph low end a yamaha QT50 ignition timing as the weather cooperates for 45.! Back your low end CDI can be used for city driving installed the HPI mini. Bring the temperature down much wall to some sort of rev limiter use the entire oil package that with.
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