1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 120Get this manual
ELECTRICAL 4-14 INSPECTIONSERVICING Pinion Inspect pinionReplace pinion if damaged or worn Armature and Commutator Inspect the commutator surfaceIf surface is gummy or dirty, clean with 400 grade emery paper A
A Measure commutator outside diameter09900-20101Vernier calipers Commutator outside diameter: Standard33.0mm (1.30 in Service limit32.0mm (1.26 in If measurement exceeds service limit, replace armature