I am putting together a wr400, 444cc big bore with 13.5:1 hc piston. I was hoping to run 98RON fuel. How do i find out what fuel to run. I know if it pings to run higher octane, but how do i determine the correct fuel. I can get higher octane but its expensive and not available at the pump. Can i run 50/50 pump and race fuel? Can i use an octane booster? Is there any fuel i cannot run Eg. Methanol, ethanol etc. There is a 10% ethanol mix available at some pumps thats called 100 octane. I live in Australia so im talking RON ratings. I want to know how to test my new engine safely to find the right fuel, and know what additives work. Hopefully 98ron will be ok but if its not i can get up to 106ron for $$$. Does any changes require jetting/fuel system changes. Thanks for the help and only answer if you have credible knowledge.