Looking in my shop manual, the starter relay should have two control wires going to it: Black and Black/Yellow. The Blk/Ylw is common. THe other wire, Blk, should go to the starter circuit relay. Presumably, when the start button is pushed, there should be 12v here. If there is, and the starter doesn't turn, I'd look at the start relay more carefully. If there isn't any voltage going to the starter relay, then check for voltage on the Ylw/Red wire going to the starter circuit relay. This wire comes directly from the starter button. Another possibility is the Blk/Red wire going to the starter circuit relay. With the ignition on and the bike ready to turn over, this should have a direct circuit to common (negitive). It goes through the starter lockout switch (?) and the neutral swith.
The only way I know of checking the starter motor commutator is to remove it and check for continuity between the segments.
Hope this helps
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