Hello riders, this thing is driving me crazy, I've searched for this topic and is impossible for me to find any good advice. I've had a motor around 7 month, I have a NT speed carb, port matched, modded piston, the only thing is I cannot find that right carburetion, that chocolate/tan color in the spark plug, I was using a ngk BH8 spark plug and it was black with a 66 jet no 4 stroking, now I'm using a BH6 and is grey (see the pic) with a 70 jet and no 4 stroking. I have a slant head with a smaller combustion chamber to increase the compression a bit. I live in Puerto Rico where the ambient temperature is around 80F - 100F. I'm usining AMSOIL, 50:1, Please help me to find the right color in the spark plug. Any suggestion will be highly appreciated :-D
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