ATHENA 0910-2505 S4F09800004B Piston Kit for Athena Big Bore Cylinder Piston Kit - 97.95 mm - Yamaha Brand_Fuel-tool and seamless integration with the

and seamless integration with the SHOEI Comlink system

Uses stock valve spring

Does not fit Twin Cooled models or models with fairing lowers that cannot be removed

Kits include all the popular sizes

ATHENA 0910-2505 S4F09800004B Piston Kit for Athena Big Bore Cylinder Piston Kit - 97.95 mm - Yamaha Brand_Fuel-tool and seamless integration with theFeatures High resistance to mechanical and thermal stresses Has been tested on engine dynamometer benches under progressive stress load, and thereafter on track to validate it performance even in the most extreme conditions Specs Compression Ratio 12. 4: 1 Displacement 450 cc Style Forged Big Bore Model Racing Piston Material Forged 2618 Aluminum Engine Type 4 Stroke Units Kit Bore Size 97. 95 mm Riding Style ATV Product Name Piston Kit Type B 2004