Pure novice here but, Perhaps your battery is low and the starter is not quite spinning things fast enough to disengage the Auto-decomp. I say maybe. My bike did this once or twice when I first got it but has not done it in over a thousand miles now. I wish you luck. I prefer not to take things out of an engine that were put there for a reason.Good luck friend.Sam
Battery is showing as fully charged on my tester.
He surely can't mean THE bearing can he - I think we'd surely be hearing it more than just on start-up it it were that!