First, remove the starter motor and text it using a 12V car battery. It should turn.. (careful though. Put it in a vice is you have one. They can jump with some force).
If that's okay, check the relay. It might only be intermittently switching.
Also, make sure the engine is turning okay by hand.
Turn the engine with the bolt that you would use to turn the engine when doing valve clearances.
If that turns okay then it's time to remove the side case and check the gearing and/or the clutch where the started motor is geared with.
You should easily find the problem if you check all these things...
This is only general advice. I can't picture the exact systems from memory.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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