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Old June 15th, 2009, 03:09 AM   #1
Ebs
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Race Gas

Just bought a '03 RM250 and haven't run any gas thru it yet. I can get 100 octane race gas from the pump locally. Would there be any benefits to run that over the regular premium pump gas (93 octane)?
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Old June 15th, 2009, 06:09 AM   #2
Medic8
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Not unless you've bumped up the timing or compression to take advantage of the higher octane.

Higher octane is actually more resistant to ignition. That's how you can compress it more without it "preigniting" (detonation, "pinging"). Without having an engine set up for higher octane, the only thing you're doing is lightening your wallet.
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Old June 15th, 2009, 10:03 AM   #3
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Use premium unless you have trouble. Before you go to 100, make sure all your jetting areas are not lean. That'll make you rattle a bit.
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Old June 15th, 2009, 03:34 PM   #4
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Sounds good guys, I'll give premium a go...I really just wanted to smell some sweet race gas fumes
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Old June 18th, 2009, 08:17 AM   #5
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Quote:
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Sounds good guys, I'll give premium a go...I really just wanted to smell some sweet race gas fumes
Run klotz benoil. About the same smell.
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Old June 18th, 2009, 08:40 AM   #6
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When I had my dirt bike I ran low led aviation fuel, but my bike had a few mods...
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Old June 19th, 2009, 12:22 PM   #7
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Run klotz benoil. About the same smell.
I would not suggest castor oil for a recreational 2 stroke with a powervalve.

(unless you like working on sticking powervalves)
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Old June 22nd, 2009, 12:19 PM   #8
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My atk dosent have a power valve, but I have had friends who have run it and not had a problem.
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