Quote:
Originally Posted by Triple Jim
For what it's worth, all I put in my 250 is 87 octane with "up to 10% ethanol added".
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Some people have no choice but to use gas with ethanol (E10). To get it to run the best possible on E10 you need to richen the mixture. The idle mixture screws should be adjusted out slightly and a shim under the needles wouldn't hurt, but the stock Main Jet is too rich anyway - so it may even run better wide-open on E10.
I can get 87 without ethanol locally, so it's all I run in my cycles and small engines. Ethanol contains and hold water, so I avoid it for anything with a metal gas tank.