Power Piston Rebuild Kit for YFZ350 Banshee ’87-06 contains pistons, rings, pins, circlips, wrist pin bearings and top end gaskets. Available with either cast or forged pistons. Superstock Power Piston Rebuild Kit for YFS200 Blaster ’88-06 complete with piston, rings, pin, circlips, wrist pin bearing and high-compression top end gaskets. Available with either cast or forged piston. Superstock Power Piston Rebuild Kit for YFZ350 Banshee ’87-06 complete with forged pistons, rings, pins, circlips, wrist pin bearings and top end gaskets.