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Everything Dirt Bike
General Dirt Bike
Fuel what do you do?
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<blockquote data-quote="cleonard" data-source="post: 11199" data-attributes="member: 21"><p>There are two octane numbers and they are derived from different measurements. One is called "research octane" and the other "motor octane." In the US we average the two and put that on the pump. In most other places they just put the research octane number on the pump. In general the two numbers differ by about 8 points. The 91 we get here will have a research of about 95 and a motor of about 87. The number in you manual is a research number so the 91 should be OK. It will be right at the limit though.</p><p></p><p>You only need to boost the octane if you have pinging. Otherwise just ride.</p><p></p><p>The weird thing is the motor number is what we should be using. It is a better representation of how we use our engines. Not good for marketing though to promote a lower number.</p></blockquote><p></p>
[QUOTE="cleonard, post: 11199, member: 21"] There are two octane numbers and they are derived from different measurements. One is called "research octane" and the other "motor octane." In the US we average the two and put that on the pump. In most other places they just put the research octane number on the pump. In general the two numbers differ by about 8 points. The 91 we get here will have a research of about 95 and a motor of about 87. The number in you manual is a research number so the 91 should be OK. It will be right at the limit though. You only need to boost the octane if you have pinging. Otherwise just ride. The weird thing is the motor number is what we should be using. It is a better representation of how we use our engines. Not good for marketing though to promote a lower number. [/QUOTE]
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