GOOFIT
Cylinder Kits 64mm For GY6 50cc 139QMB Racing Scooter
Cylinder Kits 64mm For GY6 50cc 139QMB Racing Scooter
4.77 / 5.0
(77) 77 total reviews
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- It can be only used for gy6 4stroke 49cc 50cc engine upgrade.best way to get more rpm,maximum upgrade kit for gy6 50cc 139qmb engine and 1p39qmb engine.
- Valve Length 64mm,does not for 69mm one.
- All metal components in the kit are crafted from premium materials,offering exceptional wear resistance and high-temperature tolerance.
- The core components within the kit undergo precision machining to ensure stable performance under demanding high-speed,high-pressure operating conditions.
- This enhances power output while optimizing fuel combustion efficiency,resulting in smoother engine operation and quicker response times. simultaneously,it reduces overheating risks,comprehensively improving engine reliability and durability.
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Only put a few miles as of writing this, however the engine has super high compression and lots of torque compared to my original 50cc on my tao tao 50. I mean seriously, this thing has so much compression I can't even kick over the scooter with all my weight! Hope it breaks in a bit so I can in the future, which I'm sure it will. Everything fit very well. 4 stars as the exhaust stud snapped off when re-attaching my exhaust to the bottom of the engine giving me an exhaust leak. Perhaps just a faulty stud.Came with all the necessary gaskets, and extra gaskets for other parts not involving the engine which is very nice since you may need them at some point upgrading other stuff. Didn't try the weights at all.Make sure to torque everything correctly, and to gap your valves right!
Boost my scooter over stock one,the gaskets are high quality, as is the quality of machining and the surface finish of the piston and cylinder. The included valve seals were an unexpected bonus.
Installed on Jonway Solana 49cc moped. I've only rode it for a few days now but everything installed great, and rocker arm replacements for 69mm valve were included, and installed fine as well. Provides a big power boost alone, even with every other part being stock. I intend to upgrade my carb and exhaust along with it, but It's already running like a beast (40+ at half throttle, Im sure I'll hit 50-60 full throttle after engine break in.). I'm not sure why the product comes with a spare oil pump gear, but Its nice to have anyway. I set both valve lashes to .004mm, It runs fine like that with mild clicking, so your moped, and mine, may need custom adjustment.
The kit fit great, scoot is running real good. Thanks GOOFIT
Should mention all the rest of the products definitely recommended the gy6 owner also upgrade so not causr damage trying to support bigger bore