Might want to check that before doing that. Cecil said I needed to richen up his MR9 tune by 5% before running MR12 or it would be nasty lean. I'm taking it back to him for another tune before doing something really bad to the motor using MR12 without a tune for it.
I guess if your MR9 tune was really rich you could get away with it but it just doesn't seem like anyone would tune MR9 that rich.
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Psychobike
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