GY6 63mm 180cc Big Bore Kit - ProBld

If you are looking for a really really nice 180cc big bore kit for your GY6 A (54mm stud spacing), this is the ticket! This is a forged piston with a ceramic coated cylinder to keep it cool. We definitely recommend an oil cooler for this set up.

IMPORTANT NOTE: Your engine cases will need to be bored out. This is not a drop in kit. You will need this tool CLICK HERE. In order to bore the cases, the crank shaft has to be removed. Definitely add a high volume oil pump to this set up CLICK HERE.