My guess is the battery or earth-connections (on battery and gearbox).
As a rule of thumb you can say that if the voltage measured directly at the battery goes beyond 8.5V when you try to operate the starter the battery is gone. If it’s above 8.5V it’s your starter or bad connections.
If you have problems with the starter:
Your bike have a Valeo D6RA15 starter (if you haven’t changed it), this starter have two weak spots:
Dirt prevents the starter pinion to move freely. Solution: Dismount, clean and lube.
Magnets in the stator house fall of. The magnets are glued and might get loose and block your rotor.
Solutions:
1) Get a new Valeo-starter
2) Get a Bosch starter
3) Get a Nippon Denso starter
4) Get a stator from a scrap yard (it’s used in numerous cars)
5) Get a stator with fixed magnets from Motoren Israel
I have rebuilt two starters the last weeks using method 3 (expensive) and method 5.
Some great info if you plan to rebuild the starter Joergs Motorcycle Pages: BMW Electrical
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