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  1. #1

    Quick Question. Need VERY quick answer. SLX compression

    Just looked at the ski again. I did a compression test, the first 2 cylinders from front to back both read 132 psi, the one closest to the back read 123 psi. The guy has someone coming to look at it tomorrow morning; the ski is mine if I let him know before then so any quick answer/advice would be great.


  2. #2
    No firm answer here, but compressions are supposed to be within 10% of each other, some say 5%

    So 132x10%=13.2
    132-13.2=118.8 Good ?

    132x5%=6.6
    132-6.6=125.4 So, Not to good

    But I would run it.

    Is gage accurate, is battery full charged, throttle wide open during cranking?
    Lots of variables here!!

    Cheers

    See SBT Tech section for more answers.

  3. #3
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by ryanbgb22 View Post
    Just looked at the ski again. I did a compression test, the first 2 cylinders from front to back both read 132 psi, the one closest to the back read 123 psi. The guy has someone coming to look at it tomorrow morning; the ski is mine if I let him know before then so any quick answer/advice would be great.
    1 vote YES -GO FOR IT 10% between the cyls is the limit,,,my hands and toes math sayes your good ----others will chime in
    mattman

  4. #4
    It was fully charged, throttle was not WOT. I guess I will go for it then? Whats the worst that can happen (this is a serious question haha)?

  5. #5
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Go get her!

  6. #6
    I asked for a quick reply and thats exactly what I got!!! Thanks guys!

    I guess I'll have a new ski to add to the collection haha, only this time its something decent.

  7. #7
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Your not towing it yet?

  8. #8
    Well I picked it up today. I was very impressed for the most part. However, it seems like my top speed isnt up to what others are saying (according to the mfd). I was running at 6300-6500 rpm and was topping out around 55 mph. However, it was running on old gas and very bad plugs.

  9. #9
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Keep topping the tank with fresh fuel as you run out the old,Check the fuel seperator,Fresh plugs. You can then get into checking prop and stator condition.A bad prop/stator will knock you down some.And it's new to you,so you'll learn the best position and or trimming. Also skis can change top speed with amout of fuel,conditions,etc.Maybe pick up a small LED flex neck flashlight and take a look at the piston wash,It may need some tuning.

  10. #10
    Few more questions. What is involved in changing the plug wires. I see that one cap is taped up. And should I expect the compression in that cylinder to get any worse? Or will it most likely stick at those numbers?

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