Suzuki DF 25 Service Manual page 87

Check for continuity between the commutator and the armature
core / shaft.
Replace armature if continuity is indicated.
Check for continuity between the adjacent commutator segments.
Replace armature if no continuity is indicated.
09930-99320 : Digital tester
Tester range :
BRUSHES
Check the length of each brush.
09900-20101 : Vernier calipers
Brush length:
Standard : 12.5 mm (0.49 in.)
Service limit : 9.0 mm (0.35 in.)
If brushes are worn down to the service limit, they must be re-
placed.
BRUSH HOLDER
Check brush holder continuity.
09930-99320 : Digital tester
Tester range :
Brush holder continuity :
Tester probe connection
Brush holder positive + to Brush holder
negative -
Brush holder positive + to Base plate
(ground)
Replace brush holder if the tester doesn't show the above.
(Continuity)
(Continuity)
Continuity
No
No
ELECTRICAL 4-17
Armature core
Commutator
Brush
Shaft
Brush
holder