Race Fuel

[jjco]

Should I run straight race fuel or mix it with pump gas? I have heard to run straight race fuel but also have heard to mix it with pump gas also. Can someone please helpout?

[JAG Motosports]

Depends on which fuel. The u4.2 you do not want to mix it, because it defeats the purpose of using oxygenated fuel. If it's c12 we mix it 50/50 with same results as when we run it straight.

[neveready]

This would be a question best for your engine builder based on your setup. Most mild built two strokes like right about 100 octane which is what you get when you mix C12 50/50 with 93 octane pump gas. The U4.2 is 98 octane out of the can. If the motor is stock you are wasting money with race gas. Always remember the higher the octane the slower it burns. A unmodified or even a modified lower compression motor will not burn off all the fuel with a really high octane rating and you will actually loose power.

[yfz450ba]

I have an 08 lt , and had an 07, both with high compression heads and ported cylinders. I always run 93 oct with castor 927. 4 oz per gallon. runs great:)