Simple cause.
The support bearing in the back cover need relubrication; its dry and/or worn-out and wobbles.
Have that phenomena on my VW typ 4 van. The support bearing is a bras permanent lubricated version on the VW - and is worn out. Quite annoying!
Guess you can relubricate the bearing with the startermotor inplace as I can on the VW.
If you have time - take out the startermotor, open it and regrease the "gearbox" as well. I have yet to open a startermotor that is well greased from factory...
Is it a valeo or a bosch?
Valeo startermotors (installed on all my beemers as a "tune-up") need badly to be opened when they are brand new - since they "lack" grease in the "gearbox"... Their support bearing needs just as badly to be put in oil over night to soak-up enough since they tend to be just about as dry as the lack of grease in the other end...
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Drive Safely,
Albert
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