GY6 232cc 67mm H20 Big Bore Kit - ProBld

If you want to max out your GY6 “B” motor, and stay as reliable as possible, this is it! 67mm is the largest you can go on a GY6B(57mm stud spacing). This is a drop in kit with our engine cases CLICK HERE. To make your GY6 a 232cc You must use our 8.2mm stroker crank CLICK HERE to make it a 232cc. You will also need these additional parts: a longer 94 link timing chain CLICK HERE, longer timing chain tensioners CLICK HERE, longer studs CLICK HERE, a low profile timing chain tensioner CLICK HERE,  high volume oil pump CLICK HERE, decompression big valve head with cam CLICK HERE, high torque starter CLICK HERE, and heavy duty starter clutch CLICK HERE. This cylinder requires a 6mm spacer (CLICK HERE) to be installed between the cylinder and engine case when using a 8.2mm stroker crank. We machined the 2V piston skirt to work with a stroker crank so the piston skirt won’t kit the crank on the way down. And best thing of all, this sucker is water cooled! These big motors get very hot at wide open throttle. No worries anymore. You will need our water cooler kit to go with this CLICK HERE. This cylinder is to be used with GY6 B (57mm stud spacing ) engines only. This is a forged piston with a ceramic coated cylinder to keep it even cooler. To make the bike run even  cooler add an oil cooler CLICK HERE.

Available with a 2v piston or 4v piston.