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30:1 with a tcw-3 2 storke oil or 24:1 with sae30 the spark plug gap is.030 in with a b8s ngk spark plug 30:1 with a tcw-3 2 storke oil or 24:1 with sae30 the spark plug gap is.030 in with a b8s ngk spark plug The mix for your motor is 24:1 and the gap is 30 but i use a gap of 35 on these motors. they run better for trolling also i use a hotter plug they call for a J4 but i use the J6 a little hotter running plug stays cleaner longer. I own two of the same motor, good luck with yours.

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Q: What is fuel mixture for 1957 18hp Evinrude outboard and spark plug gap?
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