As for spark plug color with the 127.5 jet at a wot 75 yard run then cut the key and gas it was dark brown/caramel color towards the electrode. I didn't get a look at it after the 125 jet because it ran so good. As for some of these big 130 to 140 jets I don't know how they would run? But we don't have the E85 as far as I know. Does the E85 require larger jets?
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