ATHENA Big Bore Cylinder Kit P400485100036 290cc for Yamaha WR

The Big Bore cylinder kit of 290cc is specifically designed for the Yamaha WR, offering a significant performance boost for your engine. Made from high-quality aluminum alloys, this cylinder is the result of over ten years of technological innovation, ensuring superior reliability and durability.

Thanks to an advanced 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 cylinder helps to improve operational performance and the longevity of the component.

With a bore of 83 mm and a stroke of 53.6 mm, the cylinder offers a displacement of 290cc and a compression ratio of 12.7:1, allowing for a maximum power output of 31 HP at 9,200 RPM. The water channels have been optimized to increase cooling capacity, while the cylinder sleeves are made with an innovative blend of silicone carbide and nickel, ensuring high performance and extended durability.

This kit is the ideal choice for those looking to enhance the performance of their Yamaha WR, ensuring precise installation and unprecedented engine response.

• Displacement: 290cc
• Bore: 83 mm
• Stroke: 53.6 mm
• Compression ratio: 12.7:1
• Maximum power: 31 HP at 9,200 RPM
• Material: high-quality aluminum alloys
• Coating: nickel-silicon alloy
• Manufacturing process: cast in steel molds and machined with CNC machines
• Optimized water channels for cooling
• Cylinder sleeves made of silicone carbide and nickel