Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11631-01 STD Viewer:456 OEM No. : 6H4-11631-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Kit 6F5-11631-00 STD Piston Kit 676-11631-00 STD Needle Valve 13370-28110-000 O-Ring 09280-13005