Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11631-01 STD Viewer:472 OEM No. : 6H4-11631-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Ring 6J8-11601-21-00 0.50 Piston Kit 679-11636-00 0.50 Washer, Plate 90201-17M00-00/90201-17M25-00 Bushing 23-815794/815794