Athena P400485100016 478cc Big Bore Cylinder Kit (98mm Bore) - Forged Piston Performance Upgrade, Converts 450cc to 478cc, Compatible with Yamaha YFZ450 ATV, YZ450F, and WR450F WARN Trucks KREEM Fuel liner is used

KREEM Fuel liner is used as a preventative measure in order to protect your fuel tank from leakage from hairline cracks and pinholes

boosting engine power while protecting against dirt

500 BPM for faster hammer drilling into masonry materials

5 Gallon fuel can set provides capacity

designed to deliver superior durability and performance for off-road riding

Athena P400485100016 478cc Big Bore Cylinder Kit (98mm Bore) - Forged Piston Performance Upgrade, Converts 450cc to 478cc, Compatible with Yamaha YFZ450 ATV, YZ450F, and WR450F WARN Trucks KREEM Fuel liner is usedUPGRADE YOUR RIDE TO THE NEXT LEVEL OF PERFORMANCE Extract massive power, aggressive low end torque, and unmatched acceleration from your 450cc four stroke engine with the Athena Big Bore Cylinder Kit (Part No. P400485100016), a premium race proven package engineered in Italy to seamlessly convert your factory setup into a high revving, high output 478cc powerhouse. Entirely cast from high grade aluminum and treated with a specialized Motor Nicksil