If you can explain which part of the plug is black and which is white. From my exoeriance if the plug is white this means it is lean. If you had a spark issue this usually leads to a black fouled plug due to the lack of spark at times or weak spark not completely burning the fuel leaving a black carbon deposite. I believe there to be a thread here for manuals which will have trouble shooting for the cdi and coil, if not send me your e-mail and i can e-mail something. What color is the rim at edge of threads? What color is the porcelan insulator? What color is the electrode and ground.this is what spark jumps. You can also give me a call @ 662-301-1563
Tom
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