CLEO GY6 180cc Cylinder Head Kit Assy 61mm Big Bore with 69mm Valves for 152QMI 157QMJ Scooter Moped ATV Go Kart Quad

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I did not have a good experience with this kit but it will take part blame it will require you to have your cylender honed dose not fit a 150cc qmj

Comes exactly as described will need case boring on any 150cc gy5 engine to 61.2 mm can be done with the ncy case boring tool! Great price and over all good quality has some signs of the cheaper side but the measurements are spot on rings fit in cylinder tight and will require additional time for break in. Everything lines right up!

It’s not 180cc. It’s a 171cc. Read most recent Q&A

My boyfriend has me order a lot of car parts off of amazon. He builds race cars and he said they were easy to install and good quality for the price

I have a Kymco People 150 and the case needs to be bored to fit this mod.

Had to cut case on my trailmaster 150 xrs and didn’t see really that big of gains if anything feels the same.

Not a bolt down kit but with alittle grinding on case it makes a difference on my trailblazer4 150x now im puting racing clutch to keep the rpm down

As long as you measure your cylinder and head studs, it fits right over the 57mm studs. The bottom of the sleeve on the cylinder won't fit in the crank bore. I took mine to a machine shop had them take shy of 1mm off. Slides right in. Great upgrade, now she lights up the tires.