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While have the IPB replaced last week, I decided to put a SE Clutch spring and SE Compensator since the primary was apart. I love the SE Clutch spring, but I now have the "chatter" that is being described here. The sound only occurs lightly at idle, an while under very light load while cruising. I can hear it best when using cruise control, and just beginning to climb a hill. Once half-way up the hill, there is enough load to make the noise stop. Before reading this thread, I had myself half-convinced it was primary chain slapping - but hey......maybe it is????
common on these bikes,when starting your bike wait until the 2 lights on the dash are off and then hit the starter button and stay on it until it starts to keep noise down.