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Your cart is empty. 1.Brand New Products with High Quality
2.Upgrade 47mm 80cc Cylinder Kit for GY6 50cc Engine
3.This Parts Fit Most of Chinese Made Scooters and ATVs.Such as JONWAY,JMSTAR,ROKETA,SUNL,TANK,PEACE,TAOTAO
antoine
Reviewed in the United States on February 16, 2025
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Dave
Reviewed in the United States on May 27, 2024
I installed this kit with the help of a YouTube video almost two years ago. I installed the kit, put fresh oil in it, installed bigger jets. Tuned the carb and it’s been running rock solid for two years!! I fill it with premium gas every time to avoid detonation because of the now higher compression motor. Not sure if it’s a big deal but I’ve had great success with this kit. It has about 30% more power than my stock scooter did. It is now enough power for our 50cc (72cc now) to carry my wife and I around town with speeds up to 45mph! (Downhill) about 35mph cruising on flat ground.
Cal ells
Reviewed in the United States on November 27, 2024
Horrible quality thin splines of metal waiting to break of and ruin the engine the only way I recommend this is if you have the tools and machining experience
Russell ratskoff
Reviewed in the United States on October 22, 2024
Drops right in and runs great for 25 bucks
Customer
Reviewed in Canada on April 10, 2024
Bought this kit for my sons quad. It came with Everything needed including gaskets and valve seals (I reused the factory valve seals as they where still mint). No instructions, however easy enough job. Just remember to put the black ring in the middle land. The quad runs great, made a huge difference in bottom end power. Will order some taller gearing and I’m sure it will pick up speed. Will update after it gets some decent run time on it.
Jean_Philippe
Reviewed in Canada on May 21, 2023
If you know what you're doing and follow good advice on youtub, it's fabulous. It really changes the performance. More torque, keeps speed going up hill, adds an average of 10 km/h on a stock 50cc with nothing else done to it.
Christian
Reviewed in the United States on March 1, 2021
Absolutely phenomenal product for the money. The quality in this kit is better than the original parts, (which for a Chinese scooter isn’t really saying much, but still)Extremely easy to install, it took me 30 minutes to disassemble my old engine parts and an hour and a half to install this kit and replace the main jet in my carb and get it running smoothly. (I am a highly experienced mechanic, but it would take someone with basic engine experience 3-4 hours total)Break it in the way you think is best. Just remember to warm it up before doing so every single time for at least the first 20 miles.It comes with more parts than you really even need, new studs, new nuts, new exhaust gasket, new umbrella seals for the valves. It’s really all there.This kit got my scooter from going about 35-40 to about 50-55, maybe more. Before, I could do about 30 on flat ground and 20 uphill, now I go about 40-45 on flat ground and 30-35 uphill.The biggest difference is the worst part of a 50cc scooter: immediate takeoff power. Before, it would have some trouble leaving a stop sign or in grass, now I have to be careful to not give it too much. Zero to 15 mph is a 250% increase in power, the rest is definitely better but nothing to exaggerate about. This kit will definitely make you feel glad you didn’t fork out the cash for a 110cc scooter, because it’s basically the same performance in a smaller package now.
angela maddox
Reviewed in the United States on May 10, 2019
Beyond impressed! Way better quality than expected and the value for the money is unbelievable. If you’ve got a 49cc 139QMB/GY6 you won’t be sorry with this choice. Solid 10 mph gain and equally impressive acceleration increase. Will work just fine with stock carb and exhaust will work ok too, but rejetting is to be expected.Note: this kit, when installed on stock stroke 139qmb, will increase engine displacement to 72cc not the 80cc as advertised. Still an excellent value though.
Michael h.
Reviewed in the United States on November 26, 2019
Great bbl kit. Not too hard to install but make sure you do your planning and research. YouTube has a few great install videos. Take your time and gap your rings correctly. Make sure your valve lash is correct! You must upjet your main jet in your carb. If you run stock mainjet it will trash your scoots engine. No matter how you plan your break in, replace the oil after you install and after about 10 hours, then again after another 10 hours. Tighten your head bolts to 13-14 torque foot pounds, also known as 19 NM.I get 40 mph out if the scoot now with no further mods, other then a cone air filter. I use a 33 pilot and a 94 main jet. Set you needle second from top (slightly rich).You can reuse your stock 33mm valve head but I recommend a bigger 47mm valve head to keep pressure and CHTs lower. You will decrease the life of your crank but that expected. Do your homework.
Customer
Reviewed in the United States on April 10, 2017
This kit installed very easy and improved performance greatly. I have a lot more bottom end power and combined with the Keihin 20mm carb and a 90 main jet with the restrictions removed from the intake I can easily cruise at 45mph. I also run 5gram rollers to increase low speed rpm I can climb the hills much better. Where I was lucky to pull 20 mph I am now at 35 mph. People expect to install just this kit and be running 50 need to understand that they have to make the other changes like I mention. You need to make sure you set the gap on the rings correctly and increase the size of the main jet or you will not get the most of it.
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