TOHATSU BFT250A Service Manual page 304

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STARTING SYSTEM
Measure commutator [1] runout using a dial gauge [2].
SERVICE LIMIT: 0.10 mm (0.004 in)
If the measurement is more than the service limit,
replace the armature with a new one.
Check for continuity between each segment.
If an open circuit exists between any two segments,
replace the armature.
Check for continuity between the armature and
armature shaft.
If there is continuity, replace the armature.
Check for continuity between the commutator and
armature coil core.
If continuity exists, replace the armature.
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[2]
[1]