Snowmobile/YamahaYamaha - Snowmobile Piston Kits Back Piston Kit 09-815 Snowmobile Parts & Accessories Type: STD 01 (0.25) 02 (0.50) 03 (0.75) 04 (1.00) Viewer:923 Item No: 09-815 Fits: 1975-1974 YAMAHA GPX 338 F/A You May Also Be Interested In Piston Ring R09-800 Piston Ring R09-818 Complete Gasket Kit HS-711247 Impeller 876120-7/834794