Ideally 14.7 if everything runs perfectly. But with fuel, timing, etc. being different many tune for 13 to give themselves a safety margin, the extra fuel can also act as a coolant. Of course the closer you are to 14.7 the more power you make and more heat. The risk is pre-detonation which can cause serious damage. On my R1 I've run 13.7 before without issue. But this is a lot like financial investments, wants your tolerance to risk?
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