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:168 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 Ring R09-812 Piston Kit 09-827 Connecting Rod Kit 296-01000-521 / 010-521 Impeller 500190