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  1. #1
    Lightning1's Avatar
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    rotax racing cam tensioner

    I am in the process of doing a head gasket on my 09 px. I had the head re-surfaced at my local race shop to clean it up. Do I really need the rotax racing cam chain tensioner (it says .010" or more) which seems to me like not much at all. I have a hard time throwing down $215 on something like that if I don't need it. It seems like anything you do is atleast .005-.010"

    I know a lot of others have done head jobs, what have you guys done? I am planning on using the OEM Elring Klinger gasket and ARP studs.

    Thanks for all thee help,

    Jeff


  2. #2
    JT jpt7779's Avatar
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    When I had my engine rebuilt due to flywheel bolt failure, my professional engine builder recommended we upgrade to the Rotax racing cam chain tensioner.
    Here is my story: http://www.greenhulk.net/forums/showthread.php?t=227324

    Contact Mike at MJ Performance for advice.

  3. #3
    Lightning1's Avatar
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    First off, nice build jpt. Secondly, is the rotax adjustablefor tension (like a threaded rod inside to set rod length)? I really have notlooked at my block, but I assume the tensioner gets some hydraulic force fromthe oil rifle like most tensioners, but I may be wrong. I figured there wouldbe just a longer rod for servicing an engine to account for the slop in thechain for say $30 like the stock piece instead of the jump up $185 to therotax. I know rotax is top quality and nice pieces, but they are not afraid tocharge you either.

    Thanks again


  4. #4
    Eastside Powersports Slow 91's Avatar
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    its hydraulic like the oem. and I have seen some machine shops take off way more than .010" and there wasn't a problem with the stock tensioner keeping the chain tight.

  5. #5
    JT jpt7779's Avatar
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    Mike told me that the Rotax tensioner was slightly longer than the OEM. They are a fixed length and NOT adjustable. I agree it is very expensive piece of metal. I put total faith in Mike and trust his advice.

  6. #6
    Lightning1's Avatar
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    I figured I would be fine, I just wanted to check. I told my shop to just surface it lightly, and they did. I am just going to use the stock tensioner with a new chain and chain guides then. My block cleaned up and is flat, so I am not even touching that.

    Thanks again

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