What petrol do you use for your Evo engines in NZ - 91 or 98 octane? My engine temp is 175-210, depending on the weather. In Asia where I lived before coming here, we only had one choice. I'm running mine on 91 at the moment but it is running a little erratic, which could be the jetting being so close to sea level - plugs look fine though. I don't think it's pinging but I might try 98 next time.
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