This may be entirely irrelevant, in which case please feel free to disregard it at will.
I understand that your starter motor is turning, but not engaging (and thus starting the engine). This was a common problem many years ago and explains why many drivers carried a hammer or heavy wrench under the driver's seat. (Honest, guv!).
On the end of the starter motor shaft was a spring-loaded gizmo, (bendix gear ?) which would extend with centrifugal force as the starter motor turned, engage with the engine, and start the damn thing.
Sometimes the gear would stick, but could be encouraged with a helpful tap with a hammer, spin, engage, and start the engine.
The 'cure' to be repeated at intervals was to pull out the starter motor (two bolts on my 1960 MM 1000), clean off the bendix gear and re-grease.
This information may be hopelessly out of date and of no use at all. But if your starter motor is spinning at the right speed when it should be, the problem is not the starter motor itself. (I think that's still true?).
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