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24:1 for break in'/first gallon of fuel, then 28:1 for the rest of the motors life. everyone has a different break in procedure, no one is better than the other per say, but i followed this oneAh YEA,! Happy Birth Christmas merry to me!! Aight. Kill switch going in tonight, power plant and brakes Saturday. I’m going to run full synthetic Amsoil Dominator. Break in 25:1? Then run a little leaner, say 28:1 or what? What’s everyone’s go to on break ins? Ratio? Break in procedure? Thanks!