what fuel for wr450 with 480 athena

Hi i just bought a wr450 with a athena big bore kit installed. What octane gas should i be running in it? I have available near me 91 octane gas without ethanol and 94 with ethanol and av gas. I can get race gas but at around 8 dollars a litre its not really something i want to use. Will 91 be ok in it? Can i mix in some avgas or will avgas be as bad as ethanol?

My understanding is you have no more compression than stock. So premium pump gas as any car or bike should be fine. You don't need any funny fuel.

Edited by stevethe

+2 on the pump premium.

Thanks for the replies i will be running premium.

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