Easy bolt-on power. This is the largest bore kit available that does not require boring your engine cases for additional cylinder sleeve clearance. New aluminum cylinder, high-performance BBR MX camshaft with lightweight piston and gaskets are included in this complete and ready to go kit. Aluminum cylinder with plated aluminum sleeve. BBR high-performance camshaft. Lightweight aluminum piston. Gasket kit including cylinder head, cylinder base and ignition cover gaskets.