Athena 07-15 Honda CRF 230 R 233cc 67mm 0.50mm OS Big Bore Cast Piston

This Athena big bore cast piston kit includes the piston itself, designed to increase your Honda CRF 230 R's displacement to 233cc. It's a 67mm bore piston, 0.50mm oversize from the standard size, intended for engine rebuilds where a bit more power is desired.

Athena uses special high-performance alloys, including nickel, silica, and aluminum, to construct these pistons. This material choice aims to match the reliability you'd expect from an original equipment piston while also offering better resistance to heat and stress. The smooth profile of the piston is designed to help with regular fuel flow and proper flame propagation inside the cylinder, contributing to efficient combustion. For some pistons, a molybdenum disulfide coating is applied to the skirt via screen printing, which helps reduce friction, potentially improving performance and extending the piston's life.