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what are some of the symtoms of a bad cdi box or one that is "going" I have a 300 bayou which is amking a chattering or noise which comes and goes. it kidnd of sounds like somethig is rattling around insode the engine. I brought it to my local kawi. dealer 2X and neither time they didn't hear any noises, but as soon as I got it home the noise was there. when I explained it to them they thought it might be the CDI box going bad and the noise I was hearing was a spark knock ???? thanks in advance