Suzuki DF25/DF30 Four Stroke Service Manual, Page 86Get this manual
4-16 ELECTRICAL 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: Standard30 mm (1.18 in Service limit29 mm (1.14 in If measurement exceeds service limit, replace armature