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  1. #1
    Dalts72's Avatar
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    Fuel octane requirement for STX 15F? Ethanol concerns?

    What fuel does everyone run through there stx 15f?

    I'm curious if I need to run 91 (mostly ethanol free) through it like my previous ski
    Last edited by K447; 06-13-2015 at 01:21 PM. Reason: Thread title


  2. #2
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    87 octane US works fine...

  3. #3
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by Dalts72 View Post
    ... I'm curious if I need to run 91 (mostly ethanol free) through it like my previous ski
    The ethanol aspect is the same for all modern watercraft. Your old machine and the new to you Kawasaki have similar fuel tank venting and fuel storage conditions.

    Non-ethanol gasoline degrades more gradually during storage. If you are using the fuel frequently then the ethanol blend does not have much time to degrade from moisture absorption, so not a concern.

    If the Kawasaki owners manual says 87 octane is sufficient then the only time to consider non-ethanol (selected premium grade in Ontario) is the few tankfuls prior to winter storage or periods of extended non-use.

    Buying your gasoline from busy gas stations and marinas that sell gasoline in volume reduces the chances of buying aged fuel.

  4. #4
    Dalts72's Avatar
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    I found the following in the manual:
    EMISSION CONTROL INFORMATION
    Fuel Information
    THIS ENGINE IS CERTIFIED TO OPERATE ON UNLEADED REGULAR GRADE GASOLINE
    ONLY.
    A minimum of 87 octane of the antiknock index is recommended. The antiknock index is posted
    on service station pumps.


    does this mean i can run 91 and be fine as it does say "a minimum of 87 is recommended" or should I dig deeper into the manual?

  5. #5
    steve45's Avatar
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    87 is the minimum. 91 is fine.

  6. #6
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by steve45 View Post
    87 is the minimum. 91 is fine.
    +1

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