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  1. #1

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    What Octain fuel to use?

    What Octain fuel to use in the U250X?


  2. #2
    250X manual states min. 90 Octane

    Quote Originally Posted by lukelegend View Post
    What Octain fuel to use in the U250X?

  3. #3
    jscottmsc's Avatar
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    Repost - Re Octane

    Quote Originally Posted by lukelegend View Post
    What Octain fuel to use in the U250X?
    90 octane gas only - NO knock-sensor
    Quote:
    Originally Posted by jscottmsc
    Is there a knock-sensor in this ski???

    Assuming YES...
    So does this mean that the ski will run on 87 octane?
    (maybe just slower due to the knock-sensor retarding timing or reducing boost)

    ...Or if it needs Minimum 90, then
    1.) if using 91 or 93 ... will the knock-sensor advance the timing or increase boost?
    2.) if only 89 is available...how much octane boost is needed to reach 90?
    Quote:
    Originally Posted by hydrotoys
    Page 115 states that "This engine is certified to operate on unleaded regular grade gasoline only. A minimum of 90 octane of the antiknock index is recommended. The antiknock index is posted on service station pumps in the USA. "
    OK. With much persistence…I finally got a (verbal) answer (2nd hand through dealer, source is development engineer at Kawi) answer to these questions:


    Scott – Q) Is there a knock-sensor on the Kaw Ultra 250X?
    Kawi – A) NO.

    Scott – Q) Can I run 87 or 89 octane in this ski?
    Kawi – A) NO. ECU map is optimized for 90 octane [only].

    Scott – Q) Will I benefit from running 93 or 100 octane in this ski?
    Kawi – A) NO. ECU map is optimized for 90 octane, performance will probably same for 90-93 octane…same or possibly slightly worse on 100 octane.

    Scott – Q) What are the consequences, if any, of running 87 octane?
    Kawi – A) Loss of power and damage to the engine due to detonation.

    Scott – Q) Would running 87 octane void the warranty?
    Kawi – A) YES. [Off the record – If you don’t tell…then it will probably get fixed under warranty.]

    Scott – Q) Can I use octane booster…if only 89 or lower octane is available?
    Kawi – A) Some of those are just snake oil…some are probably good…who knows which…better off to mix some 93 or 100 octane from the gas station with the other. However, most of engine damage we see is caused by WATER in the gas, usually purchased at a marina. Best bet is to just buy 90 [or 91-93] octane available at most gas stations.

  4. #4
    Hydrotoys's Avatar
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    A modern supercharged engine WITHOUT a knock sensor? Really? Sounds suspect to me.

  5. #5
    rhorne1053's Avatar
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    Best bet is to just buy 90 [or 91-93] octane available at most gas stations.[/quote]

    This is the exactly the problem, how many marina's carry 90 plus octane? I do not know of a single one on Santee where I ride and live. I am talking about a lake that has 110,000 acres. NO 90 OCTANE

  6. #6

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    WHy do they optimise for 90 when it is not available. MIke

  7. #7
    rhorne1053's Avatar
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    90 and above is availabe, just not on the lake here. I doubt very seriously that I will be able to ride to the north end of the lake and back without running out of gas.

  8. #8
    kristylynn9598's Avatar
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    Octane...

    All gas stations around the Greenville, SC area carry 87, 89 and 93 Octane (no 90). At Lake Hartwell, they only carry 87 octane. Don't recall ever seeing 90 Octane.

    Thanks, Jim

  9. #9
    rhorne1053's Avatar
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    Jim we have the same thing around here. Just don't have any thing above 87 on the lake. I bought a 28 gal caddie tank. I am going to fill it with 16 gal of 93 and 12 gal of 87, this will give me close to a 91 octane for less than I can buy straight 91 for.

    I just wish some of the marina's would carry something like 90 or above.

  10. #10
    kristylynn9598's Avatar
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    Sounds like a good idea. I would do the same, but there is no room on the trailer for anything but the skiis and I pull both skiis with a 07' Dodge Nitro Cross Over SUV.

    Jim

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