





WISECO 4T Forged Series Piston Kit - ø97.00mm (Manufacturer part number: W40111M09700C): forged piston for motocross, made by WISECO. Designed, forged, and machined in the United States at the Mentor (Ohio) facility, this kit showcases the expertise of a historic high-performance piston manufacturer.
This 4T Forged Series piston kit is intended for riders seeking a robust, precision-machined racing component. The forged aluminum piston offers a dense and homogeneous structure, suitable for the demands of motocross: high RPMs, thermal stresses, and repeated mechanical loads. Its finish and machining reduce play and facilitate break-in for optimal reliability in intensive use.
Main compatibilities: YAMAHA YZ 450 F (CJ21) 2016‑2017 and YZ 450 F (CJ18) 2015. Please check the part number before installation to ensure compatibility with your engine.
A technical choice to replace or prepare a motocross engine with a forged component that meets WISECO standards.