- Pro-BB – Forged piston in original OE form for big bore cylinder
- 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
- Forged pistons are forged from 2618 aluminum for superior strength and durability
- Big Bore pistons increase engine’s displacement, torque, and peak horsepower
- Kits include piston, rings, wrist pin and circlips
- Replacement two-stroke piston rings sold individually; four stroke piston rings sold as a set