Quote:
Originally Posted by yjsjin
i just tried 85 cuz i know someone was using lower dan manufacture octane and he didnt have any prob he was doing that cuz hes bike was like more than 10 yr old the engine mustv been already fucked up anyways he didnt care.. lol
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I would be really wary of 85, there's a good amount of ethanol in that. With your 12.8:1 ratio, I would ONLY use 93+. Anything can cause serious detonation at that high of a CR.
With V8 cars the generally accepted line between using 93 and 101+ is ~10.5:1, so think about how much higher than that you are (the difference being that the cylinder walls on a bike stay cooler and are less likely to detonate at higher CRs, but 12.8 is very high regardless).