1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 403Get this manual
IELECID ISTARTER MOTOR SERVICE POINTS
Pinion gear assyinspection 1Inspect: Pinion gear teeth Damagewear Replace2Check: Clutch movement Incorrect Replace
Rotate the pinion gear assyclockwise to check that it moves freelyAlso, rotate the pinion gear assycounterclockwise to make sure that it locks
Armature inspection 1Measure: Commutator undercut Out of specification ReplaceCommutator undercut limit: 0.8 mm (0.03 in)