I think starter gear is stuck on the shaft - it is supposed to lift up to and engage the flywheel when the starter spins. A spring then pushes it back down to disengage from the flywheel when the starter is de-energized. Lube the gear n shaft up and make sure the gear moves freely. Can't remember if the shaft has a spiral or straight cut on it for the gear - just look closely. You may have to pull the starter to do it, but it's not a big deal.
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