I have sat at the turn around at dorchester and swapped a couple plugs out so he could drive it back because we didn't have a 4wheeler. Everytime we pulled them they looked good. We dont shut it off every pass but once we know its good on that pill size and the weather we let it ride. 30 degrees of timing on a 150 and 28 degrees of timing on a 200. We even put a datalogging wide band it one weekend to see what the air fuel was on each pass.
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