I cant give you any exact brush measurements, but related to Jims post if they are too short the springy brush push/hold downs will bottom out on the brush holder frames therefore NOT, as he points out, maintain strong constant brush hold down pressure.
Other problems may be the commutator is all gunked and black and/or oiled over which a good clean up and polish might cure
Other problems may be the spring assemblys on the brush hold/push downs are sticking, rusted or corroded and NOT maintaining good pressure which a good clean up and light lube and exercise may cure
Other problems are the commutator may need to have its seperator insulator segments undercut because they are too high causing brush bounce and poor contact
OF COURSE THE BRUSHES MAY JUST BE WORN DOWN TOO SHORT PLUS A TON OF OTHER POSSIBLE CAUSES OF NON CHARING UNRELATED TO THE BRUSHES
If you run my Par 5 VR by pass procedure (see my troubleshooting URL) yet she still fails to charge its more likely a genny itself versus a VR problem
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