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Everything Dirt Bike
General Dirt Bike
What octane to run?
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<blockquote data-quote="AgentSmith" data-source="post: 144287" data-attributes="member: 13"><p>Big Dan and James are absolutely correct.</p><p></p><p>Run the lowest octane you can without pinging (preignition).</p><p> </p><p>In the 250s, if you are below 14.5:1, it will run fine on 91 oct pump fuel.</p><p></p><p>Running higher octane rated fuels will yield you a much slower burn rate. This means at higher rpms, more of the fuel/air charge will exit the exhaust unburned. This yields less power.</p><p> </p><p>Most people think octane is a power additive...it is exactly the opposite.</p></blockquote><p></p>
[QUOTE="AgentSmith, post: 144287, member: 13"] Big Dan and James are absolutely correct. Run the lowest octane you can without pinging (preignition). In the 250s, if you are below 14.5:1, it will run fine on 91 oct pump fuel. Running higher octane rated fuels will yield you a much slower burn rate. This means at higher rpms, more of the fuel/air charge will exit the exhaust unburned. This yields less power. Most people think octane is a power additive...it is exactly the opposite. [/QUOTE]
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What octane to run?
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