Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11635-01 0.25 Viewer:543 OEM No. : 6H4-11635-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Kit 688-11631-81 STD Piston Kit 6D0-11646-00 0.50 Collar 90387-32002 Carburetor Assembly 61T-14301-00