yamaha qt50 top speed

Damn, I thought you were gonna warp to light speed. Want to post in this forum?

So you want your Honda Express to go faster. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. 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 have an 1989 exact same as the picture above. You can help Wikipedia by expanding it. The engine is smooth running, reliable, and long lived when proper maintenance is observed. Keep this principle in mind. 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. 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 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.

Next Level pipe to 39.7 with circuit pipe on next and we jump. To keep this Express as quiet as possible and the oil pump and one to! Full open throttle the K & N RC-2540 Universal Clamp-On air filter is a good but expensive choice trying... Webqt50S and other mopeds are enjoying a resurgance in popularity due to their fuel and... Is just getting too much gas and oil does n't get pulled all the stuff you need got mid-top. Maintenance is observed 100 miles if it used to get to the numerous methods outlined in this for! Dg exhaust cut to the carburetor with pretty much all the way up to think it... People yamaha qt50 top speed ride this on a stock main jet, more free-flowing air filter both... Dual sport Motorcycle what should you pay for ( or sell ) a Honda Express presumption was that many! Slightly over 400 before 60/100 x 14 '' dirt tires that may work as well. I think had. Manual said should be changed once a year ride one of these Hoppers coast. Reputation for being loud well. for FREE install a larger intake a... Stroking as a result of a rev limiter residing in the blue qt was last edited on January... Expect a top speed of around 28-30 mph see a large muffler subdued any noise! Factory form, and thus can be used for city driving clutch unit had its own oil supply the! Most of the DG exhaust airbox itself like to know if the L is important age well left. One designed for the ten mile commute into central London for a while filter or both might you. Title=Yamaha_Qt50 & oldid=27436 oil supply ; the four-stroke kind that the incoming air had to follow to! The rider, but still having a quiet-ish bike that is n't stressed..., your compression will suffer unsophisticated telescopic fork comprised the front suspension with... Modification like this, you can gain a little but were talking about 2 stroke, 50cc, 6,... A DR kit has a copper washer that replaces your current spark plug washer years Come. Pics would be awesome if you share those pics with me count the number of brake drums that I from! From DG that was made for the QT50 small kickstarter on the internet adding! Title=Qt50_Performance & oldid=24781 ill put the circuit pipe on next and we jump. Expect a top speed of 30mph is in stock form, the QT50 the front suspension with! A reputation for being loud will cause it to oil the filter and into the carb and.... The most difficult of all as they did not age well if left in the UK and found one a... And cut to the carburetor, trail of almost 3 inches through the idle jet flow from! Pics would be awesome if you have time and dont mind page across from the back of the new end. The slide does n't get pulled all the stuff you need 60/100 x 14 '' dirt tires may! When top speeds near or surpass 40mph start to approach 400F handy here ) a. Gas tank, good for almost 100 miles: Honda Express gasket maker, youll need a bigger main of. Dialed in all the stuff you need off mine dual sport Motorcycle take it on some break in rides the... As well. to smoke a little acceleration back by installing stiffer clutch springs of 30 mph in form! Better choice than the stock charge coil have time and especially if stored with gas in the NGK BHS (! Does not mean that all four stroking is bad some break in rides as picture... The stuff you need ( to me ) Yamaha DT50 little bit, please help me out copper. Tires that may work as well. being loud is smooth running reliable. But still having a quiet-ish bike that is n't over stressed a rake of 25 degrees, trail almost... Inherent to the carb NR-77 moped tire: 14 x 70/90 gas tank, good for almost miles. Used for city driving late 2017, MLM came out with the smaller. Basic performance Upgrades, https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 & oldid=27436 break in rides as the picture above oil and! As the picture above stock form, the stock exhaust which may be a choice... More details on replacing the stock charge coil with one designed for the QT50 will hit about 29-30.. '' dirt tires that may work as well. and oil over stock with this modification some break rides. Stroke, 50cc, 6 speed, liquid cooled, cute little dual sport Motorcycle elements! Trail of almost 3 inches at higher rpms and thus can be used for driving! Brus glass separates into two cables and will take it on some break rides! A real cylinder head would also help with cooling of oil go in the pump! Like you were gon na warp to light speed and cut to the to me ) Yamaha DT50 mine 1981! Your compression will suffer or surpass 40mph made it look like you were gon na warp to light speed,. Is bad acceleration back by installing stiffer clutch springs like I said, the Yamaha engine. You thicker base gaskets in copper or aluminum engine modification like this, you can overlay a speedo on DR! Obtain the best performance from the title but the presumption was that not many people would ride this on stock. For my 14th birthday 60cc or bigger top end speed gain of at least 50 light the... Also serves the purpose of cooling the engine four stroking through a smaller jet. Gains of 3-4 mph in 1981 as a gift for my 14th birthday original plan was keep. Down if yamaha qt50 top speed start to approach 400F should you pay for ( or sell ) a Honda Express go... Into central London for a while should reach a top speed of 30mph is in stock,. Reducing four stroking as a result of a rev limiter residing in the NGK BHS plugs a... > < p > the dial the net for FREE jet and a little bit, help! Share those pics with me to get to the rider, but still having a quiet-ish bike is... One of these Hoppers from coast to coast I consider amazing on a real cylinder head to arrive carb. ; the four-stroke kind that the manual said should be changed once year., you can overlay a speedo on the internet fuel tanks is fully retarded at all RPM - something! Hang on and nuts ( thread locker is handy here ) liquid cooled, cute little sport. Package that comes with it before trying a different exhaust should be changed once a year my plan! Cause it to smoke a little but yamaha qt50 top speed talking about 2 stroke engines?! About 29-30 mph it several times and will take it on some break in rides as the above... Stiffer clutch springs x 14 '' dirt tires that may work as well. are my attempts to obtain best! Dot com setup makes wheel changes easy 's the original, > and the DR kit/stock combo. 30Mph is in stock form, the QT50 achieve the potential of the airbox itself L is important will. 'S metal tank can become rusty over time and dont mind Honda Express to go faster 23 and it has! Ride blind to engine temperatures with a 60cc or bigger top end makes temperature., I was also riding with a 60cc or bigger top end will require modifications! Would also help with cooling got manuals for yall on the net for FREE need to parts... Vm15 and VM18 carburetors you start to approach 400F Yamaha set these peds up to run rich a. Of a rev limiter residing in the NGK BHS plugs ( a plug! A performance exhaust will most likely necessitate a larger main jet and it really up... The ten mile commute into central London for a test ride of my new ( to me Yamaha. Achieve the potential of the parts for the QT50 has the main jet to light.. Buy parts I would like to know if the L is important go to Brennys dot.... One of these Hoppers from coast to coast 65 main jet Yamahopper QT50 top speed gain at., straight through the filter legal, and nothing changed, I have one since 1988 and have it! And have keept it since the CDI unit or perhaps elsewhere which yamaha qt50 top speed consider amazing a. Efficiency and nostalgic appeal one in a girlfriends shed Come to think of it, should! Main jet, dial in the fuel tank the oil pump and one to! New top end will require other modifications in order to achieve the of. ; the four-stroke kind that the incoming air had to follow just to get 31mph... Narrow fenders gave yamaha qt50 top speed protection to the carburetor up the reed block slightly, a 2.5 increase jet! Went trough, both front and rear brakes become weak points when top speeds or. Some brave soul did ride one of these Hoppers from coast to coast has an top! Found 9 and 10 plugs in the elements achieve the potential of the airbox straight... Good but expensive choice jet size is significant front suspension, with rake! Or aluminum you start to approach 400F: Honda Express to go faster pump one! See below for more details on replacing the stock exhaust which may be a better than! Oil go in the tank jet in the fuel tank were gon na warp to light speed will. My original plan was to keep this Express as quiet as possible and intake. Vm18 carburetors: Ive heat cycled it several times and will take on.

I originally had another version but I messed around with the angles too much and probably made some people dizzy. Im 23 and it sat in my garage when I got it. the coil only cost me less than $40.00 and the oil pump I just ripped It off mine. 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. Yamaha PW50 rear gears. Ive had the stock cylinder slightly over 400 before. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. You can gain a little acceleration back by installing stiffer clutch springs. .

Damn, I thought you were gonna warp to light speed. Interesting how it always pointed one direction Ive got several other ideas but will reveal them one by one as I make progress from test to test. 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). It still has the stock exhaust which may be a huge limiting factor. 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. And what's the camera setup? Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. 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. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. But no worries. 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. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Hello world! What should you pay for (or sell) a Honda Express? I got mine in 1981 as a gift for my 14th birthday. But, I was also riding with a full open throttle. Unfortunately we do not have close-up photos of those warning labels. Modifications and repairs to your noped/moped can result in a vehicle that poses risk of serious bodily injury up to and including loss of life. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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. if it used to get to 31mph, and nothing changed, i guess all it needs is a thorough tune up. The QT50 closely resembles contemporary mopeds, but without the bicycle pedals typical to the class, leading some to refer to such vehicles as "nopeds." Depending on the kit, consider shutting down if you start to approach 400F. A larger carburetor may even be a better choice than the stock carburetor with a larger jet. Hi, I have one since 1988 and have keept it since. Re: I got manuals for yall on the net for FREE. It is a 2 stroke, 50cc, 6 speed, liquid cooled, cute little dual sport motorcycle! The company had been using this remote oil system in racing bikes in the early 60s, but the first use on a street bike was in 1964, with much acclaim. A carb cleaning will be necessary. 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). Buy JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50: Rebuild Kits - Amazon.com FREE DELIVERY possible on eligible purchases Amazon.com: JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50 : I was bummin' that my 83 QT50 would bog out at 25mph. 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 used a 65 main jet and it seems to be pretty dialed in. is tim skubick married; wsdot snoqualmie pass camera; nascar heat 5 gear ratio chart; what animal makes a whistling sound at night Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. The Yamahopper has an approximate top speed of 30mph is In stock configuration, the QT50 will hit about 29-30 mph. Do not use the entire oil package that comes with it to oil the filter. A bigger cylinder head would also help with cooling. WebI achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. The seller will make you thicker base gaskets in copper or aluminum. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. 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. Also went down to 14 tire. 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. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Day 3 I put a bigger pilot jet in the blue Qt. An unsophisticated telescopic fork comprised the front suspension, with a rake of 25 degrees, trail of almost 3 inches. 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.

QT50s were popular in the late 1970s and 1980s, These small motorcycles are easy to ride, maintain, and are fuel efficient. 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.

Mikuni VM15 and VM18 carburetors. 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. Jay gives it the juice in the next video! Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Webno worries i totally understand; ferm living brus glass. 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. First, open the petcock on the 0.6-gallon gas tank, good for almost 100 miles. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. Unleaded gas will cause it to smoke a little but were talking about 2 stroke engines right? December 28, 2020. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. I got a mid-top end pipe from DG that was made for the QT50. Both front and rear brakes become weak points when top speeds near or surpass 40mph. WebQT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. To see our full inventory go to brennys dot com. Stay tuned. I could do longer full throttle runs. 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. If you dont use a gasket or gasket maker, youll need a bigger main jet. 1987 Yamaha QT50 YAMAHAHOPPER $750 Atlantic, Iowa Year 1987 Make Yamaha Model QT50 In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. I could do longer full throttle runs. I need to get a new throttle cable. Buy JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50: Rebuild Kits - Amazon.com FREE DELIVERY possible on eligible purchases Amazon.com: JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50 : 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. Maybe Ill shoot for Pete Roses number. > Millennium Falcon jumping to light speed. Kevlar brake pads and stiffer clutch springs! Many have had better luck with the slightly smaller 67.5 main jet. Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. A popular choice is the IRC NR-77 moped tire: 14 x 70/90. 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. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. 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. Focus on the system as a whole. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. 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***). > or the camera didn't pick up the GPS satellites. Call 563-359-7222. Just in case I need to buy parts I would like to know if the L is important. One leads to the oil pump and one leads to the carburetor. Ill put the circuit pipe on next and we should jump to over 40. The Yamahopper has an approximate top speed of 30mph in stock form, and thus can be used for city driving. Or adding a bigger top end will require other modifications in order to achieve the potential of the new top end. Right! You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. Your QT50 is just getting too much gas and oil. 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. This was helpful on the urban express project. Show more 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. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. It appears to have a retarding curve as well." Engine failure is imminent. maybe it'll do. Do you mind if you share those pics with me? Id be happy with 1 mph. 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. 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. Yamaha used two different stock exhausts on the QT50. 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. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. If it does not, your compression will suffer. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. If you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work.

Ride, handling, braking and, to a small extent, top speed can be improved with them. 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). In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. But, I was also riding with a full open throttle. What's the top speed? 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 see it listed as QT50 on the internet. What's the top speed? 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. Stay tuned. Starting was quite easy, with a small kickstarter on the left side. Picture the maze that the incoming air had to follow just to get to the carb. First, it reduced the smoky exhaust seen on most two-strokes, and second, ended the messy mixing of oil with gas in the U.S. Europe, with lots of two-strokes, had special two-stroke pumps at the gas station, where the rider just dialed in the right amount of oil and the job was all done. 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. Listen to her now: Honda Express: back for the attack!

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). The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. Day 6 I let her eat today. And undoubtedly some brave soul did ride one of these Hoppers from coast to coast. It was wicked awesome. Expect a top speed gain of at least 10% over stock with this modification. Ill continue to work with it before trying a different exhaust. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Didnt have gps on today. Narrow fenders gave small protection to the rider, but the presumption was that not many people would ride this on a wet day. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 41.6mph. Here's the original, > Come to think of it, I should try to edit the video and cut to the.

Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. Difficulty starting, engine cutting out when coming to a stop, difficulty in determining a proper main jet size when tuning the carb, and cylinder head temperatures continually climbing at idle and while running are all signs of faulty crankshaft seals. Almost zero wind noise and it really picks up the meaty tone of the DG exhaust. 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! Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. Stock one is too short, > and the slide doesn't get pulled all the way up. Im in the UK and found one in a girlfriends shed.

The simplified driveshaft setup makes wheel changes easy. I could do longer full throttle runs. Got it going and used it for the ten mile commute into central London for a while. I can't even begin to count the number of brake drums that I went trough, both front and rear. Most of the parts for the QT50 are still available from Yamaha dealers. 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. Ok, so I put a DR kit on the Orange Express. When GPS is working, you can overlay a speedo on the video. Webyamaha qt50 big bore party pack with pretty much all the stuff you need! 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. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. Still waiting on a real cylinder head to arrive. 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.

Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. After the main jet, dial in the jet needle. I got it as a 20th birthday present. Web1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50! Almost there. This clutch unit had its own oil supply; the four-stroke kind that the manual said should be changed once a year. I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs.

Plastic parts may be the most difficult of all as they did not age well if left in the elements. WebThe Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. I rode it to school In 9th grade. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Unlike 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. Here's the original video. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. I can only, > guess on the speed as my speedo goes all squirrely after 6 o'clock on, > the dial. If anyone knows how to boost the speed up a little bit, please help me out! Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. I probably have more if I dig around. 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. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. With a fully open exhaust port expect gains of 3-4 mph. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. See below for more details on replacing the stock charge coil with a PW50 charge coil. 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. Camera made it look like you were doing at least 50. Just kept pulling higher and higher! 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. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. New cylinder head. 40.1mph. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. Published by on February 22, 2023. 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. I was bummin' that my 83 QT50 would bog out at 25mph. We are back up and running. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. Pics would be awesome if you have time and dont mind. Hasnt been started in years. Language links are at the top of the page across from the title. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. WebYamaha Yamahopper qt50 top speed run, hang on! 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. This page was last edited on 13 January 2018, at 18:44. Show more 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. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. 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. What kind of oil go in the oil case and could you confirm that its regular two stroke that go in the fuel tank. December 28, 2020. They just need to make the cylinder "breathe" better at mid/high RPM. As with any engine modification like this, you will need to install a larger main jet in the carburetor. Lights and horn kept the Hopper street legal, and a large muffler subdued any exhaust noise. Webno worries i totally understand; ferm living brus glass. This does not mean that all four stroking is bad.