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  1. #1
    SideFX's Avatar
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    Question stupidly simple? or what? sea leve question

    * red text summs things up quicker for those into speed reading LoL

    ----

    I posted before about this problem at idling, yet running fine at mid rpm range and up, and not sure if it is or isn't the accelerator pump now due to the following weird discovery.

    Took the two skis out yesterday (XP and the SLX)
    Was about noon when we launched, and I already knew of the problem idling the slx, but had hopes and wishes to get a bit of riding on it yesterday, no matter what.

    The temperature was hot and full sunny day. She bogged at low rpm but if I used the choke, it seems to have stopped it from cutting out/dying completely.
    So messed around with this finding a few times until I switched over to the xp to ride.

    SO...the end of the day comes, it's now about 7p.m., the sun is now behind the mountain and the air is cooling off quickly.
    Back the trailer to the ramp and load the xp first.
    Then fire up the slx and low and behold, everything is running awesome.????

    Just to be sure it isn't a fluke, I take a few test rides before taking it off the water and it ran just perfect. Idle was fine, starts and stopped fine. Full acceleration from idle up was fine also, and just like there wasn't an issue at all.
    So this baffles me.
    And now that I think of it, I got this ski in the spring, ran fine. Warm weather came, ran bad. Yesterday's cooling evening ran great.
    Is this a carb tunning issue? Jets? Settings?
    But before answering, here is something that I have to also consider and has to do with the history/location of the original owner of this machine:

    Tracing the roots:
    Original owner got the ski new in 1999 and lived in Alberta Canada.
    Next owner had it shortly and lived in the outskirts of Vancouver Canada.
    Owner after that also had it briefly, then I got it.
    The other two people who had the ski probably had issues with it as well and decided to sell it when things went wrong for them. This being the idle issue I would assume. After all, since 1999 the hrs meter read only 140 hrs when I got it, so it was ridden very little and everything looked new above and below the seat.

    * My latest finding:

    Alberta Canada is 2200 feet above sea level. Vancouver is at sea level.
    Hopefully this means something which I need to learn more about.

    addendum:
    http://www.jetsrus.com/FAQ_jet_kit.htm
    Last edited by SideFX; 09-14-2008 at 03:54 PM.


  2. #2
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Pulling the choke out to run better means it's lean .
    Someone will correct me If I have this backwards, At higher sea levels the air is less dense,so carbs would be jetted to provide less gas. Bring the ski down to sea level and the ski would run lean. More Dense air but still less fuel=lean and a bog could be present. Only way to know for sure is to pull the Jets and read the sizes on them and compare to stock jetting requirements. Could be your problem,Easy one to slip by. Good thinking.

    But on a second thought,cooler air is denser too,so with it running good because of cool air goes against what the thought process is.

    Try it again on a warm day,and see if all is good now.

  3. #3
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    It would seem that w/ the higher altitude, have less oxygen, that it would be running rich with the same amount of fuel being delivered when it was at sea level. A hotter day would expand the air to reduce the oxygen even more and create more of a problem.
    Have you tried turning in the adjusters a little at a time?

  4. #4
    ph2ocraft's Avatar
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    Check your piston wash and plugs before you burn it down.
    If it were mine I'd pull the carbs, check the jetting (correct if/as needed for your elevation), clean them and see how she does.
    Verify the fuel line is not kinked or damaged.

  5. #5
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Quote Originally Posted by starflight View Post
    It would seem that w/ the higher altitude, have less oxygen, that it would be running rich with the same amount of fuel being delivered when it was at sea level. A hotter day would expand the air to reduce the oxygen even more and create more of a problem.
    Have you tried turning in the adjusters a little at a time?
    The perfect air/fuel Ratio if I remember right is 14.7:1...So with less oxygen at higher levels you run smaller jets less fuel..come down were the oxygen level is high,more fuel(bigger jets) is need to keep the same ratio.

    The factory service manual list elevation setting for above and below 5000 ft only.So I would think you should be able to adjust to 3000ft or so with stock settings,you really need to check your jets that are in there.

    Or you just had crap in there that broke free now.

  6. #6
    seaobin's Avatar
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    The temperature was hot and full sunny day.

    Explain this, you are in September in British Columbia. Are you talking mid 80's hot, or mid 95's hot. Humidity?

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