35-36 is about limit with next level pipe and 49cc. Automobiles & Motorcycles; Tools; yamaha qt50. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence.

If you eliminate all four stroking, you may run the risk of seizing your piston.

Also check the foot pegs to see if they are bent. Yamaha used two different stock exhausts on the QT50. Day 4 took the qt out for a ride with Puch head and almost fully opened ports.

I've got several other ideas but will reveal them one by one as I make progress from test to test. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory.

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. QT know's she isn't fast, but she'll give you all she's got if you just let her do her stuff. How do I fix it so that my center stand/kickstand doesnt hit it? You will need to replace your main jet with a bigger main jet. YES! Web designers, SEO consultants, etc. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal.

ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. 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***). Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. A 40 year old bike will need almost everything looked into. I put 15,000 mile's on it.

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. Idling at stop signs doesnt really bring the temperature down much. 7. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Reply. 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. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. The original tire size on the qt50 is 2.25 wide by 14 in diameter. 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. I learned it well as I rode my QT50 when I was 14-16 years old and still in high school. In addition 60cc top ends are prevalent on ebay and amazon. Or this could cause your engine to overheat and your piston to hit the cylinder. Overheating and piston seizure are traps for the unwary. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. So it has a 67.5 main jet in it now but a 70 jet is way too rich. The Jog CDI has five wires as opposed to the QT50's four. You may need to bump up to a 72.5 main jet with this filter. What should you pay for (or sell) a Honda Express? Yamaha may have intended that the bike run rich to promote engine life. 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 . Carb needs replaced subtract $35; I can probably jet higher after getting the piston to clear the ports. 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.
Yamaha Yamahopper qt50 top speed run, hang on! Stock cylinder head is horrible on cooling.

Having fun on the Yamaha qt50 Ha ha ha. But no worries. Home.

a video on this modification here at the bottom of this page. Ive used the vinegar and salt method but now mainly use EvapoRust.

Makes me wonder how anyone could really go fast with a stock head. Id be happy with 1 mph. I used a 65 main jet and it seems to be pretty dialed in. 3.8 out of 5 stars 64. . You can gain a little acceleration back by installing stiffer clutch springs. Want to post in this forum?

I was bummin' that my 83 QT50 would bog out at 25mph. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. Im looking at a QT50 that Im thinking about buying. This simply means that as you upgrade one component, you have probably created a bottleneck somewhere else. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. 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. Youll thank me later. If the turn signals fail to blink, the flasher relay has seen better days. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Even if you already have one key, have a spare key made asap. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. 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. Used Ulysse Speedometer app for my Verizon Thunder. Universal Rubber Sleeve by Motion Pro. Jemco exhaust, etc. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. In stock configuration, the QT50 will hit about 29-30 mph.

I was bummin' that my 83 QT50 would bog out at 25mph. Keep this principle in mind. 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. To see our full inventory go to brennys dot com. Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. Yeah, Im an oil freak. I also have conventional 5W-20 and 5W-30 oil.

Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. The simplified driveshaft setup makes wheel changes easy. Adjust your throttle stop screw and your idle air screw on your carb; If it passes all the tests above, is in mint condition, and has title, I wouldnt pay more than $650. 2. Most likely they are the original tires with 4000-5000 miles on them. For Cable Housing. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. A 69 jet seems better for that Orange Express.

Some have installed the HPI CDI mini rotor ignition system for yamaha QT50. Damn that was sweet!

The VM18 will require MLM's intake designed for the VM18. 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. 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. 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. 9. Ive had at least two qt50s with bald back tires. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Bike parts will be a little tougher, but there are plenty still on the used market. 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. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. This cut down on the brake bill dramatically. The Mikuni VM18 carb is almost as lethal as nitrous. Front tire was a bit wobbly at. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. 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. It also leads to using a key other than the Yamahopper one. Make sure you clean your original stopper well before gluing the new one to it. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. I ordered a puch 40mm head. Pull off the battery cover and check out the wiring in the back as well. Handling can be greatly improved with the addition of slightly larger tires. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Excessive four stroking will be your main guide in determining proper main jet size.

I might stick a performance exhaust on this next to see how it does.

Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. 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. You need one with the eyelet at the top and the clevis end at the bottom. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. What a ride it was! If you lose the oil pump, you also lose some of that snap-back tension. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil.

I have a head temp gauge but I have the 2 speed crank case from the towny. I talk about this above. Future topics to be covered: 6. Again, a performance exhaust will call for a larger main jet in the carburetor. The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. Several methods are outlined here at mopedarmy.com. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. Get an aftermarket mesh air filter. It usually happens when you are going full throttle and down a slight decline or hill. 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). Noped Thursday 2.03K subscribers Subscribe 3.7K views 4 years ago Some further tweaks yet but 49.1 mph. Ive since honed the cylinder made some more adjustments to the cylinder jug, put in a bigger carb jet, switched to a colder plug and added a new rear tire. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. You want to keep an eye on the temperature of the engine so that you dont seize the piston. New and used parts are often found on eBay as well. If it does not, your compression will suffer. 10. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. With all this in mind, what should you pay for a Yamaha qt50? Chances are your tires on your 35 or so year old qt50 are a mess. 9. The stock main jet in a qt50 is a 70. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. Engine failure is imminent. When cleaning the carb, focus on the idle jet and the seat where the needle sits. 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). Yamaha has tuned the engine to do this in that situation and it represents a compromise. Your QT50 is just getting too much gas and oil.

The qt's metal tank can become rusty over time and especially if stored with gas in the tank. Mlm next level pipe is not too impressive.

All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). 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. Adjust the oil injection pump; A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. What should you pay for (or sell) a Honda Express? So the caveat here is just because it runs and rides well doesnt mean you are home free. If it goes slower than this, negotiate accordingly. Another cooling strategy is to employ a colder spark plug. Chances are those old exhaust bolts are super rusty. 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. Next, hold a finger over the spark plug hole and have a friend kick start the bike. This was helpful on the urban express project. 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. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. Day 1 49cc engine is on my blue qt50. 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. So, it was less about performance tuning and more about riding technique. 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. 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.

Chances are you still wont get a good idea of how rusty the tank is even by doing this. The QT50 and the Honda Express are similar in appearance. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. Day 6 I let her eat today. Day 2 bumped up the main jet slightly to a 67.5 and it took a bit longer for the engine to get heat soaked. Call 563-359-7222. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. The MLM exhaust will also require you to install a bigger main jet. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Also went down to 14 tire. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). A carb cleaning will be necessary. Install a bigger top end kit or modify your stock cylinder. 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. Ill make videos of each top speed run and post them here.
We are ready to rock as soon as the weather cooperates. If it will do its top speed of 29-30 mph, youre in luck.

Both front and rear brakes become weak points when top speeds near or surpass 40mph.

QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. Almost all states require title to obtain license plates and registration. This motorcycle, scooter or moped-related article is a stub. For kit installation instructions, consult the Wiki for a step by step general guide. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. 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. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. When you do successfully extract them, replace them with new bolts of the correct size. 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. On a large ride, I was able to keep up with the Puch's and Carabela's. Titled and ready to go. I can bump the main jet again and see if that does the trick. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. -DO NOT CONTACT ME. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. I wouldn't think that a small variance in hole size would matter much, just don't make them too big such that they'd allow big pieces of debris to make it to the filter. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. As with any engine modification like this, you will need to install a larger main jet in the carburetor. 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). Ive began another Express speed project. The QT50 does not have a governor or a rev limiter. Jan 09, 2023 08:37PM. 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. 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. Chances are your tires on your 35 or so year old qt50 are a mess. If the bike doesnt run dont pay more than $150; QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. It appears to have a retarding curve as well." If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. A complete PW50 stator can be had for less than $20. 3. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). Im still undecided on what weight synthetic oil to try. This leads to hacking into the wiring. You may also choose to richen up your jet needle by moving the clip down one or more positions. Heres a nice picture of the stock tire vs. the IRC tire. Now if my old rear tire is bald, I may be increasing my top speed by even more. Swap in a slightly smaller main jet, a less restrictive air filter or both. 4. 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. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. Ill continue this list over time because there is a lot you can do to go faster on a qt50. 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. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Does the owner have title? Perhaps around 10% bigger than stock. Had a high temp of 387F and I wasnt even pushing it hard. Commentaire fait aux tats-Unis le 10 novembre 2019. Almost there. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Now the air can flow in from the back of the airbox, straight through the filter and into the carb.

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. Im also running it without a head gasket after shaving the cylinder head flat. Right and left side crankshaft seals can be found on ebay or treatland.tv. Maybe Ill shoot for Pete Roses number. This part is used to reduce the degree of performance for your motorcycle, for yamaha.

The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. 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. Now imagine what happens when you put these holes in the back of the airbox. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph.

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