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) Tire Tubes Independently tested on models like

Independently tested on models like the KTM 450SX at 16°C using the Superflow 400

For riders seeking maximum mileage and unmatched reliability

comfort and ergonomics to the next level Polisport created the Phantom Lite

Grizzly 125(05-14)

Twin Air PowerFlow Kit for Yamaha YZ450F – Part# 151917P COMPLETE POWERFLOW REPLACEMENT KIT This complete Twin Air PowerFlow kit includes the rigid aluminum cage and pre-oiled dual-stage foam filter

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) Tire Tubes Independently tested on models likeUPGRADE 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