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  1. #1
    rxpdoo's Avatar
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    Annother and hopefully the last thread on the good ole time chain mystery!!!

    Well here we go again !
    So there have been a lot of speculation about why the time chain is failing , some early , some later but mostly seen in the 2014 and 2015 models. Its kind of odd that some break early on and some later down the road but nevertheless they are breaking. A lot of people with earlier models dont have a problem at all. There are people running highly modified skis and they are still running.
    You have to also take into account the operator error, maintenance etc. The way the ski is run ... On and off the trottle, jumping waves.

    The cause for the chain failure is not 100% for sure but highly likey .
    It appears that it might not be the time chain after all. I have my 2015 at jims performance to do some work. Jim called me a couple of days ago to tell me that one of the cams , i believe the intake was 20 thousand out......let me repeat that one again.......20 thooouuuussaaannnd . This ski has only about 25 hours on it. There has not been a timing chain failure on this ski .
    It is not uncommon for cams to be out maybe any where from 2-6 thousand but no more and especially not in a modified ski.the cam does not see as much rpms as the crank and therefore it is not as critical but if they are out that much then yes. So depending on your riding style you will either see failure early or down the road.

    I would encourage for members to take the time and have both cams tested by a reputable shop and see what the run out is. For the others that already had the failure if they still have access to their cams maybe have them checked and confirm the findings.

    Hopefully jim will chime in later and add his comments. Would be great to end the time chain saga and safe the ching ching and riding time lost.
    Last edited by rxpdoo; 01-24-2016 at 08:53 AM.


  2. #2
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    Out of round or "true" got it.....
    Last edited by Mike H; 01-22-2016 at 09:50 PM. Reason: Reread the post

  3. #3
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    When the cam was put on a cam grinder to get regrounded the center journal that rides on the head had 20 thousand run off with a dial gauge indicator hooked to it.

  4. #4
    Chupacobra's Avatar
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    There was a similar case here on a local guys ski. Ski ran hard and alway sounded good. Started making a valve train noise and the owner stopped using and took it to the dealer. Cam journal was out of round causing the noise

    Id say about 40-70 hpurs on the ski. After the first 20 hours it was flashed and running 88XX for the rest of the hours


  5. #5
    now THAT makes sense!

  6. #6
    abracadabra's Avatar
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    Awesome findings!!!

  7. #7
    rxpdoo's Avatar
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    the cams were changed for the 2014 and 2015 models. this is were most of the time chain failures occurred. for every crank revolution you only see 1/2 of cam movement. depending on your riding style and if you stay a lot in the harmonic range approx. 7000 rpm range the problem gets magnified. don't exclude earlier models. you never know if the cam is out of round for some.
    Last edited by rxpdoo; 01-24-2016 at 08:54 AM.

  8. #8
    incognito's Avatar
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    Do you mean the cam was "out of round" by .020,measured at the center?

  9. #9
    incognito's Avatar
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    Quote Originally Posted by JIM'S PERFORMANCE View Post
    When the cam was put on a cam grinder to get regrounded the center journal that rides on the head had 20 thousand run off with a dial gauge indicator hooked to it.
    Jim, did u notice unusual wear on cam bearings?

  10. #10
    rxpdoo's Avatar
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    yes center. jim mentioned it already

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