Bad gas?

[VALENZ]

i was riding my banshee today and it was running Chevron gas 89 octane. i was smoking a Raptor 700r a LTR450 and a Baja 650. then I put ARCO gas 91 octane and then all those quads smoked me. does gas make that much of a difference? by quality I mean.

Edited November 15, 2009 by VALENZ

[crustydemon]

You bet quality matters, there is a huge difference between brands of fuel. Try the chevron premium and compare it to the arco or better yet get some Sunoco and see what you think.

[AKheathen]

i would do a compression check, and do a plug chop on the chevron premium. there are 2 factors here......first, your jetting could be off just a little but, and different octane fuels can use slightly different jetting, plus, time of day will have different humdity and temp, leading to different jetting needs. also, a motor with good compression should burn premium as efficiently with premium, and low grade, where the lower grade fuel should burn a little shorter, but worn cylinders may not burn the higher octane as well, and the lower octane, burning easier, will bring back a little power. finally, the fuel rating at the pump is the minimum for what could be delivered, meaning that fresh fuel in the tanks can actually be as high as premium fuel, or higher, depending on how often that fuel is sold at that station. i have seen fuel trucks deliver premium into all the tanks, although this doesn't mean it's always done. even so, i wouldn't run higher than 93octane in a stock engine, as you need higher compression to burn higher octane fuels efficiently