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  1. #1
    Vman's Avatar
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    Looks like my exhaust valves are fried...

    Leakdown failed miserably, pressure is leaking like a sieve into exhaust manifold. I was hoping for tight valve clearances, but no such luck. Every cylinder leaks pressure.

    I can't believe this thing was running as good as it was. I will post all the #'s and pics of the head when I pull it.

    98 hours on the 300 now... bad news for me.


  2. #2
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    Looks like my exhaust valves are fried...

    Quote Originally Posted by Vman View Post
    Leakdown failed miserably, pressure is leaking like a sieve into exhaust manifold. I was hoping for tight valve clearances, but no such luck. Every cylinder leaks pressure.

    I can't believe this thing was running as good as it was. I will post all the #'s and pics of the head when I pull it.

    98 hours on the 300 now... bad news for me.
    Sorry to hear but not surprised. Interested to see what they look like and yea it's pretty crazy how good it will run with leaky as valves.


    Are you out of warranty now. ?

  3. #3
    Vman's Avatar
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    Not out of warranty, but may fix it myself anyways... may be the only way to get the job done right. Still debating my course of action...
    Last edited by Vman; 11-18-2012 at 12:29 AM.

  4. #4
    Vman's Avatar
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    Compression test results:

    Cold

    1-130
    2-130
    3-130
    4-140

    Hot

    1-140
    2-140
    3-140
    4-150

  5. #5
    Mod less, ride more! troyheb's Avatar
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    Damn, Vic. Hate to hear this.

  6. #6
    Vman's Avatar
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    Valve clearances:

    Intake: 0.15-0.24 mm / .0059-.0094" specs

    1- .007 / .008"
    2- .008 / .008"
    3- .008 / .008
    4- .008 / .007"

    Exhaust: 0.47-0.55 mm / .0185-.0217" specs

    1- .022 / .022"
    2- .023 / .022"
    3- .022 / .022"
    4- .024 / .022"

    Intakes are nicely within specs. Exhausts are slightly loose .

    Leakdown results are sickening... 40-50%. #4 is the cylinder that stands out as the strongest.

  7. #7
    Vman's Avatar
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    Quote Originally Posted by troyheb View Post
    Damn, Vic. Hate to hear this.
    Thanks, man. It's ok though... we just got hit hard by Sandy. This problem is nothing compared to what many friends and family are dealing with up here.

  8. #8
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    Looks like my exhaust valves are fried...

    Quote Originally Posted by Vman View Post
    Valve clearances:

    Intake: 0.15-0.24 mm / .0059-.0094" specs

    1- .007 / .008"
    2- .008 / .008"
    3- .008 / .008
    4- .008 / .007"

    Exhaust: 0.47-0.55 mm / .0185-.0217" specs

    1- .022 / .022"
    2- .023 / .022"
    3- .022 / .022"
    4- .024 / .022"

    Intakes are nicely within specs. Exhausts are slightly loose .

    Leakdown results are sickening... 40-50%. #4 is the cylinder that stands out as the strongest.
    Looks same as mine was. Both intake and exh where out.
    Compression is the same as well with #4 being higher.

  9. #9
    Spooling's Avatar
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    So, by looking at the data you collected Vic - the exhaust valve clearences have "opened-up" slightly beyond that spec defined by Kawasaki. I assume all of this is measured at the camshaft's lobe - low position?

    What exactly does this mean?

    Is this attributed to excessive wear on the "valve seats" for each of the exhaust valves?

    Is it safe to assume by the results of your leak-down test that - the exhaust valves are not closing all the way now - due to this possible wear on the "valve seats"?

    Why is it that the valve springs presently do not have the ability to close the exhaust valves "all the way" now, and curious if a shim adjustment earlier on (say at 60 hours) would have potentially eliminated this issue you presently stumbled on?

    I as well am also curious if you used fogging oil after your rides?

    Keep your head-up (no pun intended) - as it's only the head, and could be MUCH worse.

    Lastly - maybe this is not the place for this, and if such is the case, feel free to flip me a link cause I don't ever go over to the SD side, but I am curious what kind, if any issues they (SD Guys) might be experiencing as their skis get some measurable hours on them? What about your SD?

    Thanks for sharing this with all of us !!!

  10. #10
    Vman's Avatar
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    Quote Originally Posted by sirbreaksalot View Post
    ask the dealer if you can just pay extra to the valves changed to SS units.

    who has been servicing the ski ?

    I would ask them when was the last time the clearances were checked , Its annoying that more mechanics dont do a quality job in the services , as it only takes 15min or less to check the clearances .

    Good luck Vic .

    Waz
    Thanks Waz. I do the service on the ski. This is the first time I have checked valve clearances. Ski has 98 hours.

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