Top End Rebuild Kit VTK23630A-1These piston kits ease the repair process by saving time and money. They come with everything needed to replace your piston, top end gaskets, and wrist pin bearing (for two strokes) when the time comes. Features: All pistons are heat treated with a T 5 hardening and tempering cycle. All piston skirts are coated with a high tech molybdenum disulphite coating for faster break in time and increased piston life. Cast piston kits are gravity cast aluminium