Was wondering if anyone has any ideas as to why. This was a efi machine that we converted to a carbed about one year ago. The parts needed to convert besides the carbs were all brand new. It melted the mag side plug right upto the threads. I know that it obviousley leaned way out to do this but why? It is my father in law's machine, and the trip before this had happened, we noticed a aluminum color coming from the machine's exhaust when it was idling. We checked plugs and all was good. Put on 80 miles after that and this happened.