Honda B75K2-B75K3 Outboard Motors Manual., Page 20Get this manual
Inspection 1Pistons Check the pistons for scuffing and hairline cracksReplace damaged pistonsIf carbon is accumulated on the piston crown or in the ring grooves in the piston, decarbon, taking care not to damage the pistonMeasure the piston skirt O.Dat right angles to the piston pin bossIf the O.Dis below the service limit, replace the pistonFor the service data, see page 54Piston pins If the pin scored or worn or if it does not turn freely in the piston and rod, replace itPiston ring gap Insert the piston rings in the cylinder and measure the ring gap with feeler gaugeIf the gap exceeds the service limit, replace the ringsFor the service data, see page 54
Piston skirt O.D,
Piston ring side clearance in piston ring groove Insert feeler gauge into the piston ring groove as shown to check for ring clearanceIf the clearance exceeds the service limit, replace the piston and ringsFor the service data, see page 54