Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11631-01 STD Viewer:474 OEM No. : 6H4-11631-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Kit 6D0-11631-00 STD Piston Kit 6G5-11646-00 0.50 Oil Seal, SD-Type 93102-25M11-00 Bush, Special Nylon 90386-52M02-00