Grinding noise?

2003 FZ! 30k miles. Its on the left side crankcase area. It almost sounds like a chain running over a gritty chain guide or a dirty loose chain going over a sprocket, but really loud. Could it be a bearing inside the case going bad?

It seems to do it during certain conditions. What I mean by this is on decel in 2nd gear around 3k rpms and its not always. I hear it about every 7 or 8 stops.

Any ideas?
 
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