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Motocross Action Quote
"Word to the wise. All production motocross engines are designed to run on the 91-octane, unleaded premium that can be purchased at the gas station down the street. If the engine can use pump gas under a race load without detonating, you seldom find hidden power in $25 a gallon race gas."
avgas or 100ll is NOT 25 per gallon. it's 5.65.
It's 100oct rating is for 30k altitude. (which is funny because piston planes only do about 8,000 AGL) At sea level it is 115. It has a shit ton of lead and all engines love it. I run avgas and honda hp2 at 60:1 in my two stroke and my pistons are shiny after 20 hours.
it is lightly oxygenated to help with high altitude performance. not as much as U4.4, but it's there.
The only additives that are aviation specific, are a blue dye to detect fuel leaks (serious problem on piston planes) and a high altitude anti-freezing additive. both of which have zero ill-effects on bikes or performance.
the stuff is so good, but at this point i've grown so tired of trying to explain it to the average redneck that i just dont give a shit anymore, run whatever you want.
P.S. I PROMISE that MXA quote was written before the advent of 10% ethanol gasoline.
The Shop
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