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  1. #1
    PWCToday Newbie
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    Post "Overheat" test results

    If interested, please see earlier post entitled "Bonehead award goes to me" for details.

    2007 FX/HO post overheat compression test results. Please note that a compression test had never been performed before, so I have no baseline data for comparison.


    Cyl. #1 - Approx. 170 psi

    Cyl. #2 - Approx. 190 psi

    Cyl. #3 - Approx. 200 psi

    Cyl. #4 - Approx. 200 psi

    The only significant observation noted is that the #1 plug had significant discoloring on the metal flats. The electrode body and ceramic body showed no abnormal discoloration.

    The #2 plug had some discoloration as well, but not as significant as #1.

    Plugs #3 and #4 looked perfectly fine. What is odd (but maybe coincidental) is that the two discolored plugs correlate to the cylinders with the lowest compression readings. That said, I have not noticed any changes in performance whatsoever. Acceleration and top end speed seem unchanged after my overheating screw up.

    If anyone had any comments, please let me know what you think.


    Thanks
    2007 Yamaha FX High Output
    2003 Yamaha GP800R
    2014 Stingray 180RX (Wifes Boat)

  2. #2
    PWCToday.com Is My Home Away From Home David3aces's Avatar
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    Re: Post "Overheat" test results

    put new plugs in, ride it and test again.

  3. #3
    PWCToday Newbie
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    Re: Post "Overheat" test results

    Quote Originally Posted by David3aces View Post
    put new plugs in, ride it and test again.
    Will do. I also rested it with the engine cold. I will test again at operating temperature.
    2007 Yamaha FX High Output
    2003 Yamaha GP800R
    2014 Stingray 180RX (Wifes Boat)

  4. #4
    Frequent Poster Sev1n's Avatar
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    Re: Post "Overheat" test results

    Quote Originally Posted by vetplus40 View Post
    Will do. I also rested it with the engine cold. I will test again at operating temperature.
    get yamaha combustion chamber cleaner, spray it into the intake, while running, then replace the plugs and retest.

  5. #5
    PWCToday Newbie
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    Re: Post "Overheat" test results

    Quote Originally Posted by Sev1n View Post
    get yamaha combustion chamber cleaner, spray it into the intake, while running, then replace the plugs and retest.
    I will see if I can find it at my local Yamaha dealer. Thanks for the suggestion.
    2007 Yamaha FX High Output
    2003 Yamaha GP800R
    2014 Stingray 180RX (Wifes Boat)

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