SOURCE: 75 sportster starter just spins. 1st time it did
If the starter spins but the engine does not turn, it's not your starter. It is your starter drive or Bendix on the starter shaft. Disconnect the battery. Take the outer primary cover off. Take the wires off the starter solenoid, remove the pin, cup and spring on the inside of the primary, and remove the solenoid. With this off, you can remove the starter shaft. Clamp the starter shaft in a vise with soft jaws on it. You don't want to scar your starter shaft. You'll see a round thing on the end of the shaft with two flats on it. Use a wrench to take this off. IT HAS LEFT HANDED THREADS. Slide the old Bendix off and put the new one on. Put a drop of Loctite 271 red on the threads and put the nut back on the end and tighten. Put your bake back together in reverse of how you took it apart. When you buy the replacement Bendix, but a good one. Do not buy the Chinese version, they're junk.
Good Luck
Steve
SOURCE: I have replaced starter clutch
never done one to be honest but from your description it sounds like the lever bar from the solonoid to the pinion is having a problem ,what exactly iam not sure but it does sound like your starter motor was a reconditioned unit so rather than sort this out yourself which is not difficult i would return the starter under warrenty .
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