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Ultimate Four - C12???

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i have run straight gas in my 250 f and and ultimate four...does any one use u4e (ultimate 4) or c 12 gas in their fifties??? i have an 04 crf 50 with an 82 cc kit and a bbr exhaust. . .

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You DO NOT need the U4 or any other four stroke race fuel. This may surpsise you, but those fuels are usually under 90 octane! I tried running it in my modded Xtreme at a pitbike national, and the bike barely lasted one moto before it over-heated so bad that it wouldn't run. For a bike under 7 horsepower, regular pump gas will suffice, but I like running 112 octance 2-stroke style race fuel (or mix it 50/50 with pump gas). I don't care what size of engine you have though, the U4 style is never going to help you.

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