I can only guess on the speed as my speedo goes all squirrely after 6 o'clock on the dial. That would be classic. Webno worries i totally understand; ferm living brus glass. 1987 Yamaha QT50 YAMAHAHOPPER $750 Atlantic, Iowa Year 1987 Make Yamaha Model QT50 Now imagine what happens when you put these holes in the back of the airbox. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. We are back up and running. If anything, Id try a 66 main jet next. 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. . 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.

Mlm next level pipe is not too impressive. And undoubtedly some brave soul did ride one of these Hoppers from coast to coast. These were adequate for a 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill. Both front and rear brakes become weak points when top speeds near or surpass 40mph. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. We are ready to rock as soon as the weather cooperates. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Hi. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. We are ready to rock as soon as the weather cooperates. Got it going and used it for the ten mile commute into central London for a while. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. I believe that Yamaha used a lousy charge coil on all models. I don't know if I have those skills but I'll give it a try. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. To see our full inventory go to brennys dot com. > or the camera didn't pick up the GPS satellites. I got mine in 1981 as a gift for my 14th birthday. (edited), > Go Pro Max 360. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Expect a top speed gain of at least 10% over stock with this modification. 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. You can get Dellorto jets in increments of one so I could experiment with a 64 or 66 main jet. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. Then turn the ignition key, up on the small dash, to ON, activating the CDI (Capacitor Discharge Ignition), move the starter lever over on the left grip to full choke, and kick. The steering head had 26 individual ball bearings in each of the two racesdo please be careful if ever dismantling the front end. New tires may be in store for you as well. The Yamahopper has an approximate top speed of 30mph is Hello world! #shorts #freedom About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. 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 starts to buzz past 26, and my parents told me they used to be able to get it up to the line easily (31). Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). i got one for free its been sitting behind some dudes barn for 20 years, it has 2168 miles on the odometer and the motor was locked up solid, i got it unstuck but the d*** thing wont start, turns out that 1980 coil is garbage and the oil pump dont work. 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. I was like wow! Couldve easily seized it with an extended full throttle run. But, I was also riding with a full open throttle. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. The simplified driveshaft setup makes wheel changes easy. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Almost there. Interesting how it always pointed one direction. Many attribute this wall to some sort of rev limiter. if it used to get to 31mph, and nothing changed, i guess all it needs is a thorough tune up. If you have the editing skills, just overlay the stars stretching out and warping, as if you were inside the millennium falcon cockpit, except from your point of view on the QT. The next easiest thing that you can do is slap on an expansion chanber. The Yamahopper blurb reads, Despite its low price the Hopper is equipped with turn signals, Autolube oil injection, solid state CD ignition, front and rear luggage carriers, and drum brakes at each end. The magazine does not list the low price, but the owner of this 1980 model, who bought it new, remembers paying $600 for two, one for her and one for her husband. Right! Puch head arrives Monday. 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. Jack Rutherford, Hermoso Cycle Works, churioz26, the persons shown in this video and/or any contributor are not liable for any such injury or related injuries or damage. Be nice to her. We are ready to rock as soon as the weather cooperates. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. 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). 35-36 is about limit with next level pipe and 49cc. The engine is smooth running, reliable, and long lived when proper maintenance is observed. Just kept pulling higher and higher! If you lose the oil pump, you also lose some of that snap-back tension. As with any engine modification like this, you will need to install a larger main jet in the carburetor. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). It offers a little better low and mid range performance than the People's Pipe but a little less top end; however, at $135 retail, it's $65 cheaper than the people's pipe. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Does the L mean anything? I might stick a performance exhaust on this next to see how it does. WebTop speed without an extended full throttle run of 34-35. This was a no-pedal (noped) machine, with fixed footrests and a kickstarter. The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. I probably have more if I dig around. Entertainment purposes only. I have an 1989 exact same as the picture above. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. I got one when I was 14 because in Iowa you could get a moped license at that age. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. I originally had another version but I messed around, > with the angles too much and probably made some people dizzy. We'd love to have you join the discussion, but first. If you dont use a gasket or gasket maker, youll need a bigger main jet. So you want your Honda Express to go faster. A 69 jet seems better for that Orange Express. I always wanted a blue one but the day we went to buy it they only had red. I got a mid-top end pipe from DG that was made for the QT50. Starting was quite easy, with a small kickstarter on the left side. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. I got manuals for yall on the net for FREE! Stay tuned. The following is a post that I just made to another thread. I think 2-4 mph is a bit optimistic. WebYamaha Yamahopper qt50 top speed run, hang on! Dont know what there worth. The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. I never ran into overheating problems, nor did I ever have a mechanical breakdown because I kept up on its maintenence. WebI achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. A complete PW50 stator can be had for less than $20. WebUnlike a scooter, the QT50 has no fairing, sports footpegs rather than footboards, and its two-stroke reed valve engine is slung beneath the monotube frame motorcycle-style. This page was last edited on 14 June 2022, at 10:41. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. 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. Entertainment purposes only. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Ill up my main jet. But no worries. These were adequate for a 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill. Off you go! The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. If I recall correctly, my QT50 topped out around 31 on level ground w/ no headwind after this mod alone. Webno worries i totally understand; ferm living brus glass. Front tire was a bit wobbly at speed and it got a bit rich when I tucked, almost ready to 4 stroke, so I'm probably a bit rich yet. Day 7 I opened up the side transfers on the cylinder skirt. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. Maybe sooner if you want to be more cautious. 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. Jemco exhaust, etc. Retrospective: 1979-1992 Yamaha QT50 Yamahopper, Favorite Rides & Destinations Digital Edition, KTM North America and Pierer Mobility Open New North American Headquarters, Triumph Unveils 2024 Bonneville T120 Black Distinguished Gentlemans Ride Limited Edition, Tim Card | Ep. Jay gives it the juice in the next video! Show more We'd love to have you join the discussion, but first. Save my name, email, and website in this browser for the next time I comment. Its a cutie and its very reliable. Like one of the others, I grew up in Iowa and as such, could get a drivers permit at 14 that made it legal to ride these on the streets. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. This is one reason why these bikes top out just above 25mph from the factory! This jailbreaks the relatively generous exhaust port (in the stock configuration, the piston partially covers a portion of the exhaust port at bottom dead center; the rev plate raises the cylinder jug and thus allows the piston to fully expose the exhaust port at bottom dead center). Published by on February 22, 2023. Ive had the stock cylinder slightly over 400 before. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. It doesnt work, but it will be a fun project. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. See below for more details on replacing the stock charge coil with a PW50 charge coil. Listen to her now: Honda Express: back for the attack! In stock configuration, the QT50 will hit about 29-30 mph. 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***). DO NOT attempt to duplicate, re-create, or perform the same or similar activities at home or elsewhere as personal injury, death, dismemberment, property damage, or any combination thereof and beyond may result. 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. I'll figure it out. Hello world! The thing was so slow and gutless, absolutely horrible. What's the top speed? A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. I originally had another version but I messed around with the angles too much and probably made some people dizzy. Jay gives it the juice in the next video! QT50 CDI options - The Yamaha Jog CDI can be used in lieu of the stock QT50 CDI. Consider it a $39 insurance policy. > Millennium Falcon jumping to light speed. Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. I hope compression gets better as the rings seat. Assuming PW50 rear gear gives 12.5% speed boost over stock and assuming engine can turn that same as stock gear, max speed would be 57.48 mph.The following video features activities performed in controlled environments by knowledgeable persons or a somewhat knowledgeable person. I just bought a 1980 QT50 Yamahopper in great condition, all original with original title 1 owner and am looking for a collector. But not very fast. But Im not sure how far down the rabbit hole I want to go on this one. Stock main jet size in the QT50 is a 70. Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, Iowa Urban Express Derestriction Facts and Myths, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, How to remove engine on nc50 or nu50 Honda Express, Nu50 stock throttle cable with VM20 carburetor, 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. 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. Check the ignition timing and point gap.. get a new spark plug. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Twisting the throttle sent the power back through a wet centrifugal clutch and single gear. The Yamahopper has an approximate top speed of 30 mph in You can still find a rev plate on ebay but under the moniker, "copper base gasket". Almost there. 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. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. We just recently got our moped tuned up, and I'm having a great time with it. 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. 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.

The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. Perhaps around 10% bigger than stock. A bigger cylinder head would also help with cooling. Damn, I thought you were gonna warp to light speed. 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. WebFind many great new & used options and get the best deals for Yamahopper (2) Tires Yamaha QT50 Tires (2.25x14) 1 Pair *NEW* 225x14 79-87yrs at the best online prices at eBay! However, this 5 wire box DOES NOT work for the Sting. 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. I can bump up the pilot jet instead though. This motorcycle, scooter or moped-related article is a stub. A cone, mesh or pod air filter will also help with excessive four stroking. Almost there. Just kept pulling higher and higher! Store, gas, work, home, beach, friends etcwell its fun. Website users/viewers assume any and all risk associated with such repairs and modifications and agree that anyone affiliated with qt50.net will not be held liable/responsible for any damages, injuries, loss of life, and related resulting therefrom.

Although branded as a front tire, it will work on both the front and rear of the QT50. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. Not quite what you suggested but . I need an exhaust as the one I have is broken. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. That would be classic. And what's the camera setup? Web1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50!

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