ATHENA Cylinder Kit P400485100020 499cc for Yamaha

The 499cc cylinder kit is designed to deliver high performance and reliability, making it an essential component for Yamaha motorcycle enthusiasts. Made from high-quality aluminum alloys, this kit represents the result of over ten years of technological innovation, stemming from collaborations with universities and world-renowned engine tuners.

Thanks to a cutting-edge manufacturing process, the cylinders are cast in steel molds and machined with CNC machines, ensuring millimeter precision tolerances. The special nickel-silicon alloy that coats the cylinders provides superior wear resistance, while the water channels have been optimized to enhance cooling capacity.

With a bore of 95 mm and a stroke of 63.4 mm, the cylinder has a displacement of 449.4 cc and a compression ratio of 12.3:1, capable of delivering a maximum power of 54.5 HP at 8,700 RPM. The design also includes cylinder sleeves made from an innovative blend of silicone carbide and nickel, ensuring optimal piston performance and extended cylinder life.

Each unit is tested at controlled temperatures to ensure maximum precision in the bores and surfaces, which are completely flat to eliminate any mounting inaccuracies. This cylinder kit represents an excellent choice for those looking to enhance their motorcycle's performance, guaranteeing an unparalleled riding experience.

• Bore: 95 mm
• Stroke: 63.4 mm
• Displacement: 449.4 cc
• Compression ratio: 12.3:1
• Maximum power: 54.5 HP at 8,700 RPM
• Material: high-quality aluminum alloys
• Coating: nickel-silicon alloy
• Manufacturing process: cast in steel molds and machined with CNC machines
• Cylinder sleeve: innovative blend of silicone carbide and nickel
• Precision testing: controlled temperatures for bores and flat surfaces