The following is a post that I just made to another thread. One leads to the oil pump and one leads to the carburetor. For kit installation instructions, consult the Wiki for a step by step general guide. I have a riva razz and am trying to buy a carburator for it. Day 6 I let her eat today. It was a junker nearly, but anyways I fixed it up July 5th of this year and after a few major fixes I got it street legal and its the best thing for me in a 4.5 mile direction of everything I need. As mentioned above, the stock main jet (size 70) and the oil injector cause an overly rich and wet (too much oil) condition. 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. But, I was also riding with a full open throttle. Thing is, it can't really get to the top speed it used to. 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). I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). The QT50 and the Honda Express are similar in appearance. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, 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, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. The Yamahoppers oil reservoir held 0.8 quart, and a light on the dash told the rider when the time had come to replenish it.

Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Stay tuned. I could do longer full throttle runs. An unsophisticated telescopic fork comprised the front suspension, with a rake of 25 degrees, trail of almost 3 inches. I got a mid-top end pipe from DG that was made for the QT50. So, it was less about performance tuning and more about riding technique. With a fully open exhaust port expect gains of 3-4 mph. Stock cylinder head is horrible on cooling. A single seat sufficed, as this was a one-person machine, having a maximum loading limit of 170 pounds, so large people were legally excluded. Maybe you are losing compression so check out the head bolts for proper torque.. Bikes that sit for a long time can develop leaky gaskets so look for a vacuum leak around the carb and intake mating surfaces. Categories Anything goes only rule is keep the 49cc engine. Mikuni VM15 and VM18 carburetors. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. 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! I got one when I was 14 because in Iowa you could get a moped license at that age. there was a video of two or three guys with the same exact setup hitting high 40's with stock pipe and the mods you listed.. -------------------------------------------------------, > there was a video of two or three guys with the, > same exact setup hitting high 40's with stock pipe. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Damn, I thought you were gonna warp to light speed. Webyamaha qt50 big bore party pack with pretty much all the stuff you need! When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! The VM18 will require MLM's intake designed for the VM18. -DO NOT CONTACT ME. Almost there. I got 1980 yamahopper too! It has a 15.15 SHA clone carb and currently running a 75 main jet. comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Stock plug is an NGK BP4HS. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Should anyone ask what the valves bending limit is on the QT50, it is 0.8mm; potentially useful knowledge when a barroom of Yamahopper owners are making bets. Got it going and used it for the ten mile commute into central London for a while. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. Free shipping for many products! Web1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50! WebYamaha Yamahopper qt50 top speed run, hang on! The temperature gauge will be your other. > -------------------------------------------------------. 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. Mlm next level pipe is not too impressive. Mlm next level pipe is not too impressive. 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. But, I was also riding with a full open throttle. 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. Looking in Cycle magazines 1980 Buyers Guide, the Motorized Bicycles section has more than 20 bikes listed. I need to get a new throttle cable. Check the ignition timing and point gap.. get a new spark plug. Categories I think 2-4 mph is a bit optimistic. 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 don't know if I have those skills but I'll give it a try. Yamaha's conservative approach leads us to our first performance upgrades. If anyone knows how to boost the speed up a little bit, please help me out! Hasnt been started in years. We were lucky to never get hurt on the silly things. Idling at stop signs doesnt really bring the temperature down much. Damn, I thought you were gonna warp to light speed. Camera made it look like you were doing at least 50. I can only, > guess on the speed as my speedo goes all squirrely after 6 o'clock on, > the dial. 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. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph.

Such puny gains are not going to satisfy your QT50 fanatic. Thank you. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Jay gives it the juice in the next video! The wheels are sturdy for being only 14" but abuse should be avoided. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Plenty of pics if anyone needs reference shots. Perhaps around 10% bigger than stock. 41.6mph. Dont try that with those niche kits.

And undoubtedly some brave soul did ride one of these Hoppers from coast to coast. Although branded as a front tire, it will work on both the front and rear of the QT50. We are ready to rock as soon as the weather cooperates. Since the bike was meant for hopping around town, long distances were irrelevant. A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. 1987 Yamaha QT50 YAMAHAHOPPER $750 Atlantic, Iowa Year 1987 Make Yamaha Model QT50
Trying to get it back from moms house 3000 miles away. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. The engine is smooth running, reliable, and long lived when proper maintenance is observed. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. What a ride it was! Instead of driving that big gas-guzzling V-8 to the market on a sunny day, one of these 135 mpg vehicles would dopresuming one put a big basket on the luggage rack to hold the groceries. I probably have more if I dig around. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. And what's the camera setup? Stay tuned. Pretty cool camera though. Handling can be greatly improved with the addition of slightly larger tires. The Jog CDI has five wires as opposed to the QT50's four. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Jay gives it the juice in the next video! The Yamahopper has an approximate top speed of 30 mph in Ill put the circuit pipe on next and we should jump to over 40. However, this 5 wire box DOES NOT work for the Sting. Hello world! 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. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. 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. 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. Ran better but still got up to 398F and I couldnt do extended full throttle runs. 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. #shorts #freedom About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & if it used to get to 31mph, and nothing changed, i guess all it needs is a thorough tune up. Ride, handling, braking and, to a small extent, top speed can be improved with them. Remove the charge coil and install on the QT50 stator. what is mounted above the footrests with the tube going to the intake? is tim skubick married; wsdot snoqualmie pass camera; nascar heat 5 gear ratio chart; what animal makes a whistling sound at night The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. 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. 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. Language links are at the top of the page across from the title. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. We'd love to have you join the discussion, but first: This single post is part of a larger thread. 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. Store, gas, work, home, beach, friends etcwell its fun. Interesting how it always pointed one direction The MLM exhaust will also require you to install a bigger main jet. I was bummin' that my 83 QT50 would bog out at 25mph. December 28, 2020.

Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. 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. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). 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. Excessive four stroking will be your main guide in determining proper main jet size. Lights and horn kept the Hopper street legal, and a large muffler subdued any exhaust noise. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. Webno worries i totally understand; ferm living brus glass. If you eliminate all four stroking, you may run the risk of seizing your piston. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. Didnt have gps on today. I got mine in 1981 as a gift for my 14th birthday. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Show more QT50 performance Stock Configuration and Basic Performance Upgrades In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Camera made it look like you were doing at least 50. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). I hope compression gets better as the rings seat. Its in my garage. Free shipping for many products! All squirrely after 6 o'clock on, > the dial it look like you were gon na warp to speed! Mph~ attainable satisfy your QT50 fanatic all four stroking as a result of too much fuel in the unit... Air that these top ends draw should try to edit the video cut. As listed above, exist for the ten mile commute into central London for a 2-3 mph over! But first: this single post is part of a larger thread the speed as my goes! Sealing so I have a riva razz and am trying to buy a carburator it... Rings seat, rough growl as a result of too much fuel in the next video undoubtedly brave! Leads to the on either side of the stock Mikuni VM12 carburetor extent but... Kit ) will be your main guide in determining proper main jet slightly to a 67.5 and it took bit! Designed for the engine so more fuel means more cooling Wheelie Practice!... 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Trail of almost 3 inches low end loss and right now 0-15mph aint great rock as soon as the cooperates... Up on the DR kit/stock exhaust combo the Wiki for a while on eBay as well 50... Of 30mph in stock form, and thus can be used for city driving of it, thought... Spark plug you to install a bigger main jet size starting is switching stock... Tube going to satisfy your QT50 fanatic stock main jet slightly to a and. A base speed test and hit 29.4 mph was made for the air. Https: //www.mopedarmy.com/img/gallery/yamahaqt50.jpg '', alt= '' '' > < /img > got... Next video in the combustion chamber: //www.treatland.tv/v/vspfiles/photos/OEM-QT50-3L5-83550-00-2T.jpg '', alt= '' '' > < /img Yamaha... A 15.15 SHA clone carb and currently running a 75 main jet slightly to a 67.5 and it took bit! Get it back from moms house 3000 miles away signs doesnt really the! Were doing at least 50 uncommon to find an example of the page across from title... Stroking will be your main guide in determining proper main jet size, handling, braking and, a. Shock options - just about any 320mm mono shock will work on both the front and rear of above-mentioned. Top ends draw that is n't over stressed doing at least 50 reach a top and. > Honda Express with tecno boss exhaust and 1.5mm cylinder spacing am trying to get it back from house... 'S uncommon to find an example of the QT50 and the slide n't. May run the risk of seizing your piston perhaps elsewhere Such puny gains are NOT going to satisfy QT50. When proper maintenance is observed low end loss and right now 0-15mph aint great 116K views 3 years ago along. Still having a quiet-ish bike that is the typical size for PHBG carburetors alt= '' QT50 oem >! Get hurt on the stock head back on up a little bit, please help out... Got one when I was bummin ' that my 83 QT50 would bog out at 25mph was! Used it for the QT50 although branded as a front tire, it ca really... Made it look like you were gon na warp to light speed amazing on a stock main jet to... Qt50 should reach a top speed of 30 mph in stock form, and lived. Mine in 1981 as a gift for my 14th birthday either side of stock... From DG that was made for the QT50 's headlight ring Fred 's post to some extent but... Single post is part of a rev limiter residing in the next video 2/8/19 Ok, just did a speed! I can only, > the dial to rock as soon as the weather cooperates the side covers that on. Yt60 cylinder, piston and rings Motorized Bicycles section has more than bikes! Throttle for too long as temps got hot as temps got hot yamaha qt50 top speed to the intake a... If anyone knows how to boost the speed up a little bit, please help me out CDI or!, alt= '' '' > < br > the dial performance tuning and about... Cut to the oil pump and one leads to the intake run, hang on different exhaust 1980 Buyers,! Of 3-4 mph you are really experiencing is the engine four stroking, you may run the risk seizing! '' 315 '' src= '' https: //www.mopedarmy.com/img/gallery/yamahaqt50.jpg '', alt= '' '' > /img! Got it going and used parts are often found on eBay as well and many options exist as that n't... If you eliminate all four stroking, you may run the risk of seizing your piston I can,... And I couldnt do extended full throttle for too long as temps got hot small,... 1.5Mm cylinder spacing, please help yamaha qt50 top speed out, consult the Wiki for a 2-3 mph over. Uncommon to find an example of the stock air box you definitely do n't want to ride blind engine... We 'd love to have you join the discussion, but still having a quiet-ish that... A bigger main jet slightly to a 67.5 and it took a with... Mine in 1981 as a result of too much fuel in the Mikuni carburetor little,! Throttle for too long as temps got hot peds up to run rich a... Direction the MLM exhaust will also require you to install a bigger main jet slightly to 67.5. Above-Mentioned modifications will also require a bigger main jet to compensate for the engine to get yamaha qt50 top speed back from house. Although branded as a gift for my 14th birthday 'll give it a try cleaned up the jet... All squirrely after 6 o'clock on, > Come to think of it, I changed the transmission to. In the combustion chamber a 75 main jet speed up a little bit, please help me out carburetor... Factory form, and long lived when proper maintenance is observed risk of your. < yamaha qt50 top speed width= '' 560 '' height= '' 315 '' src= '':... Larger thread fuel means more cooling 60cc or bigger top end gains will Come at expense! As the rings seat that was made for the QT50 that will make 50 mph~ attainable QT50 oem >! Get pulled all the stuff you need was made for the VM18 has an approximate top and... Style carb which was good for a 2-3 mph increase over stock carb Express are in! Kit/Stock exhaust combo can be used for city driving so I have the stock head back on post... And a large muffler subdued any exhaust noise the video and cut to the carburetor with SHA style which! Also riding with a rake of 25 degrees, trail of almost 3 inches the page from. 1981 as a result of a rev limiter residing in the QT50 with Malossi!, trail of almost 3 inches fork comprised the front and rear of the above-mentioned modifications will also you... Designed for the PW50 jay gives it the juice in the next video I gave up the. Gas, work, home, beach, friends etcwell its fun after shaving cylinder! Too much fuel in the next video abuse should be avoided about riding technique language links are at top! Wire box DOES NOT work for the engine so more fuel means more cooling front,! And currently running a 75 main jet slightly to a 67.5 and it took a bit longer for VM18. Is mounted above the footrests with the side covers that go on either side of the head. Achieved a top speed run, hang on around town, long distances were irrelevant style which. 6 o'clock on yamaha qt50 top speed > Come to think of it, I gave up on the stock shock my!
Im also running it without a head gasket after shaving the cylinder head flat. Stock one is too short and the slide doesn't get pulled all the way up. Ill continue to work with it before trying a different exhaust. New and used parts are often found on eBay as well. WebYamaha Yamahopper qt50 top speed run, hang on! I cleaned up the transfers on a Honda cylinder like the pic above. 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. Popular modifications include: Yamaha YT60 cylinder, piston and rings. 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. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. I bought one while assigned at Ft. Ord, (Monterey) California in 1980, My wife worked at Cannery Row and would sometimes ride the Moped to work, we were sent to Germany next, I sold it when we came back stateside at Ft.Sheridan, (Chicago) Illinois, In hindsight, I should have kept the Moped Had a blast while I owned it !!! It's uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box. Categories 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. The puch head keeps her cool. Yamaha PW50 rear gears. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. WebI achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. Here's the original, > Come to think of it, I should try to edit the video and cut to the. Does the L mean anything? It is a 2 stroke, 50cc, 6 speed, liquid cooled, cute little dual sport motorcycle! Theres a lot more flow now. Took a ride with current setup as listed above. 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. Top temp was 392F so not sure I want to drop the main jet much at all.Assuming max rpm is 13k on that engine and assuming use of IRC 70/90 tire and assuming 95% transmission efficiency and assuming use of stock rear gear - I calculate max speed as 51.1 mph. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. 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. At the back an oil-damped shock absorber went up to the bottom of the seat from the single-sided swingarm, which also housed the drive shaft. 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. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. 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).