Air Fuel Mixture

Guys, good pm. I need some help. What is the best air fuel mixture on sniper mx? I already try standard settings, then 2 turns, 2 1/4, 2 1/2, 2 3/4 and 3 turns. But my problem is, i cannot find the optimum mixture. my spark plug still turn into black not rusty brown. I use ngk iridium spark plug.. Is there something wrong with my MC?



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