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Fitshaced
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I ride a 2001 F4i which I don't have the original owners manual. I was just wondering if someone could tell me what octane gas the manual asks for. It's bone stock and I've been running 93 but it smells like it's running rich so if it calls for lower octane I'm going to switch.
 

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I believe i read in my manual not long back that it takes a min of 91 oct we don't have 91 octane around here so i use 93 w/ no problems BTW...mine is a 2001 f4i once again im not positive but i believe it said min. 91 octane
 

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Honda recommends 87 octane for the F4i.

Higher octane gas does not "burn more efficiently" or "run better." Higher octane prevents knock (detonation, preignition); unless you have higher compression or are tuning the bike yourself, you probably aren't going to need higher octane. A stock F4i on 87 octane shouldn't be knocking (I don't think Honda's engineering is that bad). :)

Basically, using higher octane is just a waste of money and can actually reduce power since it burns slower (in order to prevent knock).
 
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