Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11635-01 0.25 Viewer:548 OEM No. : 6H4-11635-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Ring 6G0-11610-20 0.50 Piston Ring 61N-11603-00-00 STD Pinion Gear 688-45551-00-00/688-45551-01-00(13T) Transom Wedge TW-2-DP