Category Snowmobile/YamahaYamaha - Snowmobile Piston Kits Back Piston Ring R09-816 Snowmobile Parts & Accessories Type: STD 01 (0.25) 02 (0.50) 03 (0.75) 04 (1.00) Viewer:159 Item No: R09-816 Fits with Piston 09-816 Bore Size: 73mm Stroke: 64 Fits: 1983-1991 Yamaha VMX 540 You May Also Be Interested In Piston Kit 09-817 Piston Kit 09-801 Gasket, Cover 911878 Complete Gasket kit HS-711277