1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 240Get this manual
8-11 POWER TRIM AND TILT Inspection Armature and Commutator Check for continuity between the commutator and the armature coreshaftReplace armature if continuity is indicated09930-99320Digital tester Tester range(Continuity)
Check continuity between the adjacent commutator segmentsReplace armature if no continuity is indicated
Inspect the commutator surfaceIf surface is gummy or dirty, clean with 400 grade emery paperMeasure commutator outside diameter09900-20101Vernier calipers Commutator outside diameterStandard 22 mm (0.87 in Service limit 21 mm (0.83 in If measurement exceeds service limit, replace armature