Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6F5-11631-00 STD Viewer:945 OEM No. : 6F5-11631-00-STD For YAMAHA Outboard 40 HP You May Also Be Interested In Piston Kit 6L1-11645-01 0.25 Piston Ring 6R5-11605-00-00 0.50 Cover, Water Inlet 6P2-45215-00-00 Gasket, Inner Exhaust 343853/0343853