Kits are cast aluminum alloy (not forged) with an 18-20% silicone content, which produces a light but strong piston. Piston skirts are Bisulphide-coated for faster break-in time and increased piston life. All pistons are heat-treated with a T-5 hardening and tempering cycle . Standard pistons and components are O.E.M. replacements . A, B, C, and D piston sizes are 0.01mm variations in the piston size to increase or decrease the clearance within the cylinder, except for overbores . Kits include piston, ring, piston pin (wrist pin) and circlips . 

**2-stroke piston kit shown