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Thread: Lean Run away

  1. #1
    oct6454's Avatar
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    Lean Run away

    Well, Ive been talking to forum member Jim about this issue for quite awhile now, so i figured it was time to make a thread. So the story goes that I have 2 99 GTX's and they're my project ski's for this spring as I have been trying to get them running then probably sell them. Anyways, both carbs have been rebuilt by the previous owner who kept them in VERY good condition but they both immediately start to run away once you get them started. So I've pulled both carbs and began to go through them. the first thing I checked was that the previous owner didn't mix up the o-rings on the high and low speed screws. those checked out fine so now I'm at a loss of where to look next before i re-install them and see if it was a possible throttle linkage issue. Any ideas on where this air leak could be?


  2. #2
    A smart admits!A wicked excuses!An idiot insists! mitsakosgt's Avatar
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    Check the gaskets on the bottom of the carbs.After that and if the linkage is good,I think you have to check the crank seals for leaks.Once you start the ski spray some wd40 behind the flywheel.If the rpms drop you have bad seals!

  3. #3
    oct6454's Avatar
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    Okay I'll go ahead and check those gaskets on the bottom of the carbs. The crank seals should be good because these motors have 0 hours on them.

  4. #4
    flyin' the friendly skies airbornexp's Avatar
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    did you clean the screens in the carbs when you checked the orings and gaskets?

  5. #5
    oct6454's Avatar
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    Yes, the screens were clear and appeared to be brandnew like the previous owner had said.

  6. #6
    2 main causes of runaways on 951's -
    1. throttle cable adjusted too tight
    2. idle speed set too high

    some 951's run away easier than others. It should be set to idle at 2800 rpm's in the water. Seeing as the carbs were recently removed, I'd vote for #1.

  7. #7
    oct6454's Avatar
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    Okay, I'll make sure that when i put them back in that the throttle cable isnt adjusted to tight. If by idle speed you meant the idle screw, I had that things backed all the way to where it wasnt touching the hammer haha! Do you mean 1800 in the water?


    Thanks, Oliver

  8. #8
    canuck's Avatar
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    Check the seal between the intake, reed cage and crankcase. Use new gaskets on the carb bases when reassembling.

    My 98 feels comfortable at 1400 to 1500 rpm idle in the water which is usually just over 3K on the trailer.

  9. #9
    SURFnTURF's Avatar
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    Quote Originally Posted by Wire4Money View Post
    2 main causes of runaways on 951's -
    1. throttle cable adjusted too tight
    2. idle speed set too high

    some 951's run away easier than others. It should be set to idle at 2800 rpm's in the water. Seeing as the carbs were recently removed, I'd vote for #1.
    +1 . The idle should be set at 2800rpm out of the water, which is about 1300 -1500 rpm in the water.

  10. #10
    Quote Originally Posted by oct6454 View Post
    Okay, I'll make sure that when i put them back in that the throttle cable isnt adjusted to tight. If by idle speed you meant the idle screw, I had that things backed all the way to where it wasnt touching the hammer haha! Do you mean 1800 in the water?


    Thanks, Oliver
    yes, sorry - 2800 out of the water.

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