Have had 400 2-stroke, old (98) 500 carb, and now have two 500 EFI's. Always run 87 pump gas with stablizer. Friend has a 2010 800 EFI in his 6x6 and also runs 87 with no problems. Extra octane is wasted on a low compression motor. You might think it runs better but it won't unless you increase the compression. Sad but true.
anything higher then 87 octane is not going to boost your performance at all on a lower compression engine such as these machines. at best you will just be throwing money away, at worst you will actually cause a knock....different octane fuels burn at different speeds and your ATV cant compesate to advance or retard the timing (knock sensor in cars)
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