Fuel Octane for 2007 Sportster - Harley Davidson Forums



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Fuel Octane for 2007 Sportster

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Old 12-17-2009, 12:35 AM
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Default Fuel Octane for 2007 Sportster

Hi,

What grade of fuel do you recommend for a 2007 Sportster Custom? should I use the highest (92)?
Thanks.

C
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Old 12-17-2009, 02:22 AM
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I always use the highest grade possible. The couple of times I've been forced to use a lower grade (gassing up in a small town) I could hear pinging.
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Old 12-17-2009, 07:39 AM
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http://hdforums.com/forum/search.php?searchid=3652502
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Old 12-17-2009, 10:01 AM
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I'd go with what the owners manual says and go with 91 or better.
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Old 12-17-2009, 11:29 AM
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You didn't mention the engine size.....makes a difference.
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Old 12-17-2009, 11:39 AM
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Harley specs call for:
All EFI (07 & up) Sportys = 91+ octane
For 06 and earlier Sportys, 883 = 87 octane - 1200's = 91+ octane.

This is using the USA (R+M)/2 octane rating system.

Last edited by cHarley; 12-17-2009 at 12:14 PM.
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Old 12-17-2009, 11:42 AM
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That's curious. Why would the change to EFI in 2007 cause a need for higher octane fuel on the 883 models? As far as I know, the engine, compression ratios etc etc remained the same.
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Old 12-17-2009, 11:51 AM
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I run 92-93 even 94 if I can find it. I never go below 92 on my bikes.
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Old 12-17-2009, 12:05 PM
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Quote:
Originally Posted by SportyPig View Post
That's curious. Why would the change to EFI in 2007 cause a need for higher octane fuel on the 883 models? As far as I know, the engine, compression ratios etc etc remained the same.
It has to do with with a change in ignition timing on EFI motors to provide a better fuel burn. I "assume" that is all related to HD going to EFI to provide a cleaner burn to meet the EPA crap.

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Old 12-17-2009, 03:51 PM
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okiee dokie. Glad I have a carb. EFI will be a much better mouse trap, once they finally figure out how to tune and adjust the damn things.

Once I complete my next upgrade, I'll certainly be running higher octane. But for now, 87 works just as good as 93.
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