Suzuki DF25/DF30 Four Stroke Service Manual, Page 212Get this manual
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 grit emery paperMeasure commutator outside diameter09900-20101Vernier calipers Commutator outside diameterStandard 19.5 mm (0.77 in Service limit 18.5 mm (0.73 in If measurement exceeds service limit, replace armature