2008 Honda Aquatrax ARX1500T3/T3D factory service manual, Page 407Get this manual
ELECTRIC STARTER INSPECTION Measure each brush lengthSERVICE LIMIT: 6.5 mm (0.26 in)
Check the commutator for damage or abnormal wearDo not use emery or sand paper on the commutator
ARMATURE
Check the commutator bar for discolorationClean the metallic debris off between commutator barsReplace the armature with new one if necessary
Check for continuity between pairs of commutator barsThere should be continuity