I had a similar issue on my 1250.
The return spring/gear stop mechanism had worked it's way loose from a previous owner having jacked around with it.
It was allowing the flange of the drive gear to push into the flywheel. I caught it before it got too bad because I notice the starter making some abnormal noises.
I ended up having to fabricate my own spacer/gear stop and return assembly out of some tube steel and washers. It actually worked out really well.
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