Yamaha Marine Outboards Factory Service / Repair/ Workshop Manual 225G 250B L250B, Page 332Get this manual
STARTER MOTOR
3Inspect: Commutator undercut Dirtforeign matter Clean(with compressed air)
4Measure: Commutator undercut Out of specification Replace the armatureCommutator undercut limit 0.2 mm (0.01 in)
5Inspect: Armature continuity Out of specification ReplaceArmature continuity Commutator segments a