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  1. #1

    What's considered good compression on ultra 150?

    I'm lookin at a 2005 with 45 hours on it tomorrow and can't remember what a good compression reading would be.

    Many thanks

    David

  2. #2
    pokechop2006's Avatar
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    im thinking 120 across the top as long as its with in 10 of each other you should be ok.with a bump of compression like i have is 140.

  3. #3
    110-130 on a stock compression ski.

  4. #4
    Does a weaker battery affect compression readings?

    Should I remove all three plugs first, and then test compression or remove one plug at a time test that cylender and reinstall plug then move to the nextcylender?

    Thanks guys!

  5. #5
    I'd rather be jet skiing Saltwater n Premix's Avatar
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    Yes. You need a full charged good condition battery for accurate results. Crank with WOT. Remove one plug at a time.

  6. #6
    steve45's Avatar
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    Higher elevations will lower compression, too.

  7. #7
    SJ-(KY)'s Avatar
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    150lbs compression with 160-165 squish is where its at on stock pistons ... That area is good for big smiles..lol... But to a serious not 120-125 are excellent compression #'s for a stocker with stock heads.... If it starts getting under 105lbs I'd re-ring it for my taste...

  8. #8
    old thread but relevant. did a compression test on my friend's 99 Ultra 150, got 85PSI on all three cylinders. tried a different gauge and got the exact same numbers. this was with carbs removed, wide open ports. the spark plugs still fire but they are oil soaked. he says the ski runs about 50mph tops.
    I'm guessing from previous replies that the compression is too low, but seems strange all 3 cylinders would drop the same amount.


  9. #9
    sdlvx's Avatar
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    Quote Originally Posted by PSD View Post
    old thread but relevant. did a compression test on my friend's 99 Ultra 150, got 85PSI on all three cylinders. tried a different gauge and got the exact same numbers. this was with carbs removed, wide open ports. the spark plugs still fire but they are oil soaked. he says the ski runs about 50mph tops.
    I'm guessing from previous replies that the compression is too low, but seems strange all 3 cylinders would drop the same amount.
    That's pretty normal if it has a ton of hours on it. I've done it to my first ski.

  10. #10
    what did you do to your ski? run it so long the compression dropped off? and evenly on all 3 cylinders?

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