A powerful engine with added performance: Athena is pleased to present the new big bore cylinder kit, developed for Yamaha YZ 450 F 2020-2022. Completely designed in Italy by the R&D department, this kit is an aftermarket solution that significantly boosts torque and power without compromising the motorcycle's efficiency and safety. The kit only includes Athena's top-quality components: an aluminum cylinder with nickel-plated cylinder walls, a forged piston for maximum resistance, and a gasket set manufactured using a state-of-the-art process. After several prototypes and quality checks, the cylinder kit was tested under extreme conditions on the Dyno and the track. The result is a reliable kit that delivers explosive power at low, medium and high revs. The Big Bore cylinder kit for Yamaha YZ 450 F 2020/2022 can be installed without any crankcase machining despite the increased siz