because of a situation i had with my bike cutting out while turning, try this. start it, put it in neutral, now turn steering full left and full right. With a bit of muscle involved, repeat, but lean the bike over left an right side, put the front brake on, give the bike a shake etc.. you want to simulate all possibilities, try to re-encountrer the fault from the stationary position

Does this kill the motor at all?-
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