Shop by Brand Yamaha OutboardPiston/Piston Kit ; Piston Pin ; Piston Ring Back Piston Kit 6H4-11631-01 STD Viewer:457 OEM No. : 6H4-11631-01-STD For YAMAHA Outboard 40, 50 HP You May Also Be Interested In Piston Pin 688-11633-00 Piston Pin 6K7-11633-00-00 Gasket, Exhaust Outer Cover 6J8-41114-00-00 Bolt 90116-10175-00