ATHENA Cylinder Kit P400485100011 250cc for Yamaha

The 250cc cylinder kit is specifically designed for Yamaha motorcycles, offering high performance and a responsive throttle. Made from high-quality aluminum alloys, this cylinder is the result of over a decade of technological innovation, ensuring reliability and durability over time.

Thanks to an advanced manufacturing process, the cylinders are cast in steel molds and machined with CNC machines, ensuring micron tolerances at every stage of production. The internal surface is coated with a nickel-silicon alloy, which enhances wear resistance and the longevity of the cylinder.

The optimized design includes revised water channels for better cooling capacity and cylinder sleeves made from a special blend of silicon carbide and nickel, ensuring superior mileage and a long operational life. Each cylinder undergoes rigorous quality control, tested at controlled internal temperatures to ensure maximum precision.

With a bore of 77 mm and a stroke of 53.6 mm, this cylinder offers a displacement of 249.6 cc and a compression ratio of 12.5:1, delivering a maximum power of 33.8 HP at 9,800 RPM. It features two piston rings and chrome-plated piston rings, ensuring optimal performance and easy installation.

• Bore: 77 mm
• Stroke: 53.6 mm
• Displacement: 249.6 cc
• Compression ratio: 12.5:1
• Maximum power: 33.8 HP at 9,800 RPM
• Material: high-quality aluminum alloys
• Internal coating: nickel-silicon alloy
• Casting: steel molds
• Machining: CNC machines with micron tolerances
• Optimized water channels for cooling
• Cylinder sleeves: blend of silicon carbide and nickel
• Piston rings: two piston rings
• Piston rings: chrome-plated
• Rigorous quality control