Besides the electrode color, also look at the ceramic. Pure white means you're on the verge of detonation, not enough fuel or too much timing. Little tiny dots on the ceramic are pieces of aluminum from the pistons, you have reached detonation at this point.
Bad detonation will chew up the electrodes and/or break off pieces of the ceramic.
You will also find, with a nozzle system, that the #1 & 2 run the leanest, while 7 & 8 are the richest. Always tune your mixture and timing for the #1 & #2 cylinders.
This is the exact opposite of supercharged applications, where 7 & 8 run the leanest.
I found a 12 to 1 air/fuel mixture and 32 degrees total timing works the best for me, a good combination of reasonable power with safety.
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