Athena

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 size. TECHNICAL FEATURES The Yamaha YZ 450 F 2020-2022 engine is identical in regard to it’s compactness and lightweight feel. Along with the new Athena Big Bore cylinder kit, it boasts of excellent torque and power performance, delivering  over six hp  more than the original cylinder kit. To achieve these results, Athena engineers designed top-quality precision components: BIG BORE ALUMINUM CYLINDER Besides modifying the cylinder following Yamaha’s overhaul of the YZ 450 F engines after 2020, which changed the shape and inclination of the cylinder along with the oil passages, Athena engineers adjusted the machining to deliver a significant increase in the bore to Ø102 mm. Despite the increased size, the R&D department has designed this kit  without having to bore the crankcases and with no additional machining required . Produced by  gravity casting  and a  heat treat process , designed to  improve  its  mechanical characteristics , the Athena cylinder ensures  maximum resistance  even at the highest temperatures. The liner is designed to ensure a  premium smooth finish  lasting a lifetime, due to a special coating in nickel and silicon carbides. HIGH-QUALITY FORGED PISTON Designed by Athena engineers, who studied the cylinder and created a system that outperforms the original. The piston delivers a  superior   power explosion  at low to medium revs and at high engine speeds. The results, which also showed a marked  increase  in  torque  and  compression ratio , came from bench and track tests. Manufactured by reverse extrusion, using high-precision technology, this  forged piston  delivers  ideal flow  and features  polished profiles for perfect front flame amplification . The  segments  provide an optimized tangential load for a  correct balance between lubrication and sealing , while the  piston pin  comes in high-quality  alloy steel  for maximum resistance. ITALIAN-MADE GASKET SET The kit contains the gaskets required to install the cylinder kit , including the cylinder head gasket and base gasket, redesigned by Athena engineers to fit the new Yamaha cylinder oil passages. The  rubber-coated metal base gasket  features  silicon creasing  in critical areas on its surface that R&D engineers identified during the design phase. The creasing is near the crankcase joints and is ideal for  preventing  liquid  leakage . In contrast, the  MLS  (Multi-Layer Steel gasket)  head gasket  is constructed with three blades: the outer blades are in rubberized sheet metal, while the central one is in AISI301 stainless steel to  withstand high levels of compression . ATTENTION! All Athena products must be used in compliance with the specific national regulations of the member state where it is being marketed or sold. Athena declines all responsibility for any improper use.