Piston Kit Forged Series for 4-StrokeForged 4-stroke piston is designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strengthDedicated forgings allow for optimized strength-to-weight ratioIdeal for multiple purpose ridingKit includes piston, rings and circlips'13-'15 Gas Gas EC450F the stroke length is 63.40 mm and 12.3:1 compression ratio for standard 95.00 mm bore. Fits Nikasil bore cylinder.