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Message: <blockquote data-quote="dan filipi" data-source="post: 11265" data-attributes="member: 54">I'm about ready to pack up my #1 carb and send it off to you to sort this out!!!There has got to be a reason for the fouling. I've been picking my brain the last couple days.I don't see how it can be spark because you swapped coils and wires.To my surprise, my number 4 plug was black before doing a idle drop and sync, I went for a short ride and it's clean!Try this.With the engine warm, use a spray bottle and spray water on the exhaust pipe, the actual pipe at the head not the chrome shield.Spray each one and compare how the water vaporizes.If #1 is actually running rich it will be cooler.I found the problem with my number 2 carb this way and used it as a tuning tool.</blockquote>