18mm mikuni, jet to large?

chris /
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alright ive just got my 70cc alukit with the 18mm mikuni running and it seems to run without bog only when clip on needle in carb is at the highest position(leanest). Problem is after a short ride it seems to foul the plug still like its still too rich. I even have air mix screw out 1 and a half. Should i start by getting a smaller main? I dont see too many people running this carb but it is a bat out of hell im just trying to get it dialed in right any nice advice would be appreciated. The carb has stock jets main 70, pilot 30.

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