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  1. #1

    05 f12x Low Compresion!! Not starting!

    Hey, Recently bought a 05 f12x that was not running. I thought it was something simple such as fuel or such, that turns out not to be the case. The ski is only pulling 30psi of compression in each cylinder. Pulled the head and all the valves are in good shape and not bent. What is the issue?

    Thanks
    Greg


  2. #2

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    how did the cylinder bore look and the tops of the pistons

  3. #3
    Cylinder wall had very little surface rust which was rubbed off with oil and rag. and tops of pistons looked normal.

  4. #4

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    was the battery strong and all the other plugs pulled out as a weak battery will give you low numbers

  5. #5
    Battery was fine and all plugs were pulled. Starting to wonder if corroded valves are stopping it from getting a good seal?

  6. #6
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    Did you open the throttle Wide open , while testing compression? If not, go back and re-test.

  7. #7
    I didn't but im getting between 15 and 30psi. will throttle really make up the for the 100 lost psi?

  8. #8
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    Yes it will make a big difference.

  9. #9
    Tried it and didn't make a difference. what does this point to?

  10. #10

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    if the head looks good like you say then try pulling the intake hose of the turbo and holding throttle wide open when testing you could have a clogged air filter from salt and other stuff

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