WSM Top End Kit - +0.75 mm - Honda 54-231-13 M1 YZ/YZF/WR Bolt Kit AMA/MotoAmerica

AMA/MotoAmerica

In cooperation with several Yamaha teams and riders Twin Air has developed a new Airbox Kit for the Yamaha YZ250F/450FKit creates more open space within the airbox to optimize the airflow into the engine

Combined with Graves’ exclusive flash tune map this system produces a solid 15+ HP in the midrange and 11+ on the top of the horsepower charts

Natural Stainless Steel

WSM Top End Kit - +0.75 mm - Honda 54-231-13 M1 YZ/YZF/WR Bolt Kit AMA/MotoAmericaTop quality piston kit Includes pistons, rings, pins, clips, needle bearings, head and base gaskets and intake and exhaust gaskets and oil filter for 4 stroke models