Athena P400485100032 290cc Big Bore Cylinder Kit (83mm Bore) - High-Performance Forged Piston Upgrade, Converts 250cc to 290cc, Compatible with Yamaha WR250R & WR250X (2008-2021) Work Belt and LTZ 400 (2003–2013)

and LTZ 400 (2003–2013)

a premium OEM-quality replacement designed for the RMZ450 (2018-2024) and RMZ250 (2019-2024) models

and impressive mileage for long-distance riders

hitting rugged trails

Athena P400485100032 290cc Big Bore Cylinder Kit (83mm Bore) - High-Performance Forged Piston Upgrade, Converts 250cc to 290cc, Compatible with Yamaha WR250R & WR250X (2008-2021) Work Belt and LTZ 400 (2003–2013)UPGRADE YOUR RIDE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low end torque, and unmatched acceleration from your 250cc four stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400485100032), a premium race proven package engineered in Italy to seamlessly convert your factory dual sport setup into a high revving, high output 290cc powerhouse. Entirely cast from high grade aluminum and treated with a specialized Motor