Is this under load but at low revs like coming out of a slow corner? I asked the shop about this a while back and was told it was because the motor doesnt like to be lugged, keep the revs up and it is fine. I only ever have it happen at low revs where the bike labors under torque to pull itself along. It is a deep down slapping noise that sounds like the thing is coming apart and wants to toss parts up through the tank. Keep the revs up and it never happens.
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