2005 SO Johnson 4 Stroke 9.9-15HP Outboards Service Manual, Page 83Get this manual
ELECTRICAL ELECTRIC STARTER SYSTEM Measure commutator outside diameter Standard: 1.14 in(29.0 mm) Service limit: 1.10 in(28.0 mm) If measurement exceeds service limit, replace armatureCheck for continuity between the commutator and the armature coreshaftReplace armature if continuity is indicatedCommutator
2Armature core 3Armature shaft
Check that mica (insulator) between the segments is undercut to specified depth Standard: 0.02 to 0.03 in(0.5 to 0.8 mm) Service limit: 0.01 in(0.2 mm) If measurement exceeds service limit, cut to specified depth