Manifolds cracked totally off 2 years ago @ 600 miles (now 3800) I had the manifold pipes tig welded to the flanges. When the manifolds were cracked the sled was realy loud at idle when cold and it would back fire "pop" when ever I let off the throttle. What I have now is the occasional pop and the irradic idle. I will have to pull off the tank and check the pipes, I am putting my money on bad donuts.
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