NCY GY6 150 62mm Ceramic Big Bore Cylinder Kit.

Watch out, because this isn't a bolt on item for most GY6 125 and 150 engines. Engine cases must be machined. Order the NCY bore up tool if there is no access to a machine shop. It’s also recommended to get a large valve head as well.

This is for A case GY6 engine with 54mm cylinder bolt spacing