Originally Posted by camlifter
i've mixed E-85 with 87 octane before, it makes for a leaner jetting,...but the e85 mix gives a higher octane, home made race gas if your jetted for it.
I think you mean lower octane don't you? E-85 is Oxygenated 85 Octane? If it has the affect of leaning it out it is comparable to lower octane gas. Higher octane gas burns slower, more controlled and requires more compression to burn properly! So it does run better leaned out but it's not "race" gas it's a properly "tuned" fuel delivery sytem.
2 strokes are typically low compression motors and don't require high octane gas. They do love to run lean though! That is, until they sieze!
Toker, the needle only affects fuel mixture from about 1/4-1/2 throttle. Idle jet (circuit) below 1/4 and main jet above 1/2 throttle.
Don't mean to be nit picky but gasoline properties are widely misunderstood and the source of much confusion.
P.S. If you want to tune your engine, learn how to tune your engine! I think it kind of backward to look for a chemical mixture to solve your engines running issues.