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'21-'23 Gas Gas EC250F compression ratio is 13.8:1. '14-'22 Husqvarna FE250 compression ratio is 13.9:1. '14-'15 Husqvarna FC250 compression ratio is 13.9:1. '13-'15 KTM 250 SXF/XCF compression ratio is 13.9:1. '17-'22 KTM 250 EXCF compression ratio is 14.4:1. '14-'16 KTM 250 EXCF and '13-'16 KTM 250 XCFW compression ratio is OE.