If the starter motor is running, the solenoid is working. Is the "over running" spring, cup, and pin in place? Is the shifter fork for the starter shaft positioned correctly in the collar behind the Bendix.
Disconnect the battery, remove the primary cover, and take the solenoid off but leave the plunger for the solenoid in position. Now, with the solenoid off, pull the plunger back in the direction that the solenoid would pull it. Watch the starter shaft and make sure that it moves forward and engages flywheel. Take the starter off and make sure the small gear on the end of it is in good shape as well. Try that Bendix with your hand, It should turn one way but not the other. Even if it does, that doesn't mean it's good. If it turns in both directions, it is bad.
http://www.bikebandit.com/1972-harley-davidson-xlh/o/m1748#sch195980
Good Luck
Steve
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