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  1. #1

    1100 loss of compression

    Took my 1100 out last August and noticed the ski was sinking. The engine kicked into idle and I was able to make it back to the beach. The water was level was just over the coupler. I trailered the ski and drained the water. All plugs and flush ports were properly sealed- still not sure how I got the leak.
    Got the ski home and treid to crank it again. After several hours I never got it started again. Frustrated I cleaned it up an put it in the garage.
    Pulled it out again this week and did a compression check only getting a little over 95 on each cylinder. Thought it was a carb problem, but apparently not. I put a new piston kit in this ski about 3 years ago and have had no problems and have put little time on this ski.

    I'm at a loss of why I lost compression.

    Any ideas ??

    J


  2. #2
    seaobin's Avatar
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    only way you could drop to 95 on all cylinders is if you blew the seal on you head.

    one cylinder, would be a different story

    Quote Originally Posted by piercam View Post
    Took my 1100 out last August and noticed the ski was sinking. The engine kicked into idle and I was able to make it back to the beach. The water was level was just over the coupler. I trailered the ski and drained the water. All plugs and flush ports were properly sealed- still not sure how I got the leak.
    Got the ski home and treid to crank it again. After several hours I never got it started again. Frustrated I cleaned it up an put it in the garage.
    Pulled it out again this week and did a compression check only getting a little over 95 on each cylinder. Thought it was a carb problem, but apparently not. I put a new piston kit in this ski about 3 years ago and have had no problems and have put little time on this ski.

    I'm at a loss of why I lost compression.

    Any ideas ??

    J

  3. #3

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    Sounds like a head gasket ??? Might try a leak down test if you have access to an air compressor and the leak down tester. My vote would be on the head gasket, maybe some water got into the cylinders.
    Remove the plugs and look down in the cylinders and see if its wet.

  4. #4
    dghal's Avatar
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    it actually should start on 95 lbs,,, have you used this gauge before? on this motor? what were the readings?

    what really concerns me is the bay was flooded and the engine died, and you said you never got it started again... hopefully you do not have rust inside that motor now..

    do you have spark?


    Let us know what you find,,,

  5. #5
    Quote Originally Posted by piercam View Post

    only getting a little over 95 on each cylinder. Thought it was a carb problem
    Just for curiosity in the logic...
    How do you relate the 95 psi compression to a carb problem?

    FYI
    > Not all gauges read same. One may read lower or higher than the actual (usually lower because seals go bad).
    > On 1100 motor, 110+ psi at sea level is good.
    > No more than 5% delta between each cyl is a good sign.

  6. #6
    Pain is fear leaving your body.... rlovebk's Avatar
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    I agree with Greenman. Because you had 95 on all 3 speaks to the gauge. You may have had a cooling line cut loose or?
    Guys are right though, need to get it running to dry it out. Start with basics: Pull a plug and check for spark. Make sure fuel is turned on. Spray a little starting fluid or carb cleaner into venturi's and turn over with plugs in if you have spark. Check head gasket out if it fires up by putting it on the hose. Do not turn hose on unless you get ski running first. If you can't get it running make sure and fog it best as you can.
    Coupler level is not a ton of water. You can always put a little water in the hull while its on the trailer and see if/where it leaks out. Good luck and keep us posted.

  7. #7
    seaobin's Avatar
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    pull the heads and post pics of the piston crowns.

  8. #8
    Pain is fear leaving your body.... rlovebk's Avatar
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    Quote Originally Posted by seaobin View Post
    pull the heads and post pics of the piston crowns.
    You just want some piston porn don't you Sean...

  9. #9
    seaobin's Avatar
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    its been like three month man. thinking about going and pulling one of mine apart for a little peek.

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