GY6 63mm 205cc Big Bore Kit for 8.2mm Stroker - ProBld

This is our ProBld 205cc big bore cylinder kit for your GY6 A motor (54mm stud spacing). The thing that makes this kit so unique, is the spacer for the 8.2mm stroker crank is built into the cylinder. It has a forged 63mm piston with a ceramic coated cylinder to keep it cool. Pair this kit with our ProBld Ultimate Head (w/ compression release) for easy startup and max air flow (huge 30.5/26.5 valves) CLICK HERE!

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.