WISECO is the world's largest manufacturer of tuning pistons. WISECO has been building HIGH PERFORMANCE pistons for motorcycles for over 40 years. Extensive research and the latest CNC technology guarantee the highest precision and maximum performance. We deliver the entirekit with pistons, piston rings, 18mm pins, clips and COMETIC head gasket. CNC machined WISECO aluminium forged pistons provide higher torque and more power for all GSX1100 `80-`83. For overhauled stock engines and tuned racing engines!