Honda BF35A-BF45A Outboard Motors Shop Manual., Page 197Get this manual
HONDA cINSPECTION
BRUSH LENGTH
Measure the brush lengthIf brush length is less than standard, replace the brush holder
STANDARD
16 mm (0.6 in)
SERVICE LIMIT
12 mrn (0.5 in)
BRUSH INSULATION
Check for continuity between the brushesThere should be no continuity