This is a brand new piston set (STD size) For Yamaha Outboard Motor ,And also for Parsun,Hidea,Seapro,Hangkai,HDX etc 2 strok 40HP ,E40X series.
Ref. Part No: 66T-11631-00
Piston Diameter: 80mm / 3.149in
Wrist Pin: 20mm / 0.787in
It used on:
for Yamaha 40HP E40MH 40X outboard engine
E40MLHW-REV - 1998 E40MLHX - 1999 E40MLHY - 2000 E40MLHZ - 2001---up
Parsun 40HP E40MH 40X boat motor