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Will that be Regular or Super?

Discussion in 'XJ Technical Chat' started by JaiFer, Jun 24, 2015.

  1. JaiFer

    JaiFer Member

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    I've followed this site for a year now and I've haven't heard this subject discussed. What grade of fuel is recommended? I have used both and don't see difference in performance. Opinions anyone?
     
    JaiFer, Jun 24, 2015
    #1
  2. bmarzka

    bmarzka Active Member

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    I run 93 octane in my 700 because it's air-cooled and I've heard that 93 burns slower, thus cooler. And 93 contains less ethanol.
    And besides, nothing is too good for my XJ.:cool:
     
    bmarzka, Jun 24, 2015
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  3. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    I use 87 in EVERYTHING.
     
    hogfiddles, Jun 24, 2015
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    Stumplifter likes this.
  4. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    ^^ What he said. ^^

    Our bikes are realtively low compression, and do not require higher octane. A higher octane fuel does not "burn cooler". Octaine is a measure of a fuel's ability to resist detonation (burning due to the heat in the cylinder instead of the spark event; higher compression engines cause the air/fuel mix to get hotter during the compression cycle than a lower compression engine will). Unless you have a high compression engine you are wasting money by using high test fuel.
     
    k-moe, Jun 24, 2015
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  5. rocs82650

    rocs82650 Well-Known Member

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    87 + a double shot of seafoam.

    Gary H.
     
    rocs82650, Jun 24, 2015
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    Beekman likes this.

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