





WISECO 4T Forged Series Piston Kit - ø77.00mm (manufacturer part number W40151M07700A): forged piston designed for modifications and replacements on motocross machines. Made from forged aluminum, this piston is aimed at riders and builders who value the durability and longevity provided by a machined component treated for severe conditions.
Wiseco Forged Series pistons are recognized for their forged construction, suitable for the thermal and mechanical stresses encountered in off-road environments. This kit is suitable for overhauls or modifications requiring a quality piston after checking the bore and adhering to manufacturer tolerances.
Main compatibilities: YAMAHA YZ 250 F (CG39) 2018, YAMAHA YZ 250 F (CG34) 2016, YAMAHA YZ 250 F (CG39) 2017. For reliable installation, check the pin, piston-cylinder clearance, and follow the manufacturer's installation and break-in recommendations.