Snowmobile/YamahaYamaha - Snowmobile Piston Kits Back Piston Kit 09-816 Snowmobile Parts & Accessories Type: STD 01 (0.25) 02 (0.50) 03 (0.75) 04 (1.00) Viewer:938 Item No: 09-816 Yamaha No: 8U9-11631-01-94 Bore Size: 73mm Stroke: 64 Fits: 1983-1991 Yamaha VMX 540 You May Also Be Interested In Piston Kit 09-807 Piston Ring R09-807 Complete Gasket Kit HS-711200 Gear Housing 1623-8951A43