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Old Apr 17, 2013 | 10:54 AM
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First off, I didn't take time to do a search for this. So my service manual has conflicting info in it, on one page it says I need to run 91 octane minimum but later it states I need to run 87 minimum. I know it's only a few pennies difference in the grand scheme of things but... I figured I don't need the higher octane since I don't believe the stock evo is a high compression engine. Any thoughts?
 
Old Apr 17, 2013 | 10:58 AM
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Sorry guys, I'm going to re post in the fuel section, I couldn't figure out how to just delete the thread.
 
Old Apr 17, 2013 | 10:58 AM
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I run 87 most of the time. When it gets up around a 100 deg. here in Kansa I run 89 just to make sure it does not pre ignite. That is in my carbed 99 EVO.
 
Old Apr 17, 2013 | 12:07 PM
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I'm pretty sure my owner's manual states to use 91, which is what I usually put in. Just to see if there was a difference in running 89 I've tried that a few times. The bike seems to run just as good as with the higher octane.
 
Old Apr 17, 2013 | 12:21 PM
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I run 87 when the temps allow it and I've never heard my engine complain. Could proably run it when it gets hotter out but, as you said, it's only a few pennies difference and I'd rather play on the safe side.
 
Old Apr 17, 2013 | 12:24 PM
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I run 90 ethanol free. No problems.
 
Old Apr 17, 2013 | 01:17 PM
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I run 93 octane 100% gas in my EVO. I can feel more vibrations with the 87 octane fuel.
 

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Old Apr 17, 2013 | 02:45 PM
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I do the highest octane, since it clatters with lesser grades.
 
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Old Apr 17, 2013 | 07:16 PM
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Originally Posted by ChickinOnaChain
I do the highest octane, since it clatters with lesser grades.
. From what I've been told, the 883 sporty is the only Harley you can run regular in. Harley says all the others require premium.
 
Old Apr 17, 2013 | 07:18 PM
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I get the highest octane I can, usually 91 around here. I figure the little bit extra I'll pay for 5 gallons of gas is worth it for something I have put a lot of money into already.
 



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