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Old 10-09-2012, 09:41 AM   #3
mike54
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Joined: Mar 2004
Oddometer: 13,091
It could be the throttle bodies. The shaft wears and allows the butterfly to move in pulse with the intake. I would call that a tapping sound but some might call it knocking. Easy enough to put a finger on the shaft while the bike is running and see if it makes a difference.
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