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2008 yz450f Octane Rating

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I just recently bought a 08 yz450, I was flipping through the manual & it says "Premium Unleaded Gasoline Only With A Research Octane Of 95 or Higher".

That is 91 motor octane right?

Edited by joshstefan

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Yep, 95 octane is the European equivalent to US 91 octane.  Definitely run ethanol free if you can find it.  Unfortunately for me and others in Colorado, our fuel sucks and even the 91 oct isn't all that great.  Ethanol in fuel is a joke and causes more mechanical problems than it does any good for the environment.  But I am a firm believer that all powersports toys should be ran on premium, as a general rule.

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Pump gas in the US is rated based on an average of RON and MON, also called AKI or anti knock index. If you look at the pump you’ll see it says (R+M)/2 somewhere on it

RON is typically a higher, thus the 95 number for RON. 

 

Read thr the measurement methods section 

 

https://en.m.wikipedia.org/wiki/Octane_rating

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