Cam Chain Noise On Honda NX650

Discussion in 'Motorbike Technical Discussion' started by camaroz28, Sep 19, 2003.

  1. camaroz28

    camaroz28 Guest

    Hello y'all,

    My '95 Honda NX650 Dominator (same as the XR650 except for some plastic)
    with 14K miles on it has a noise coming from the engine which I think is
    the cam chain scraping against something. It's very loud when the engine
    is cold, especially at high rpms, however after riding for 10-15 minutes
    the noise is only present above 2500-3000 rpm.

    Today, after getting my Clymer repair manual in the mail, I decided to
    do something about it. I've removed the cam chain tensioner thinking
    that's the problem. Now I'm not so sure since it seems to function like
    it's supposed to.

    When holding the tensioner in my hand I'm unable to turn the bolt it's
    mounted on counter-clockwise, but it's no problem clockwise. I assume
    this is the way it's designed. However, the cam chain seem to have a lot
    of slack, easily 1/2 inch, but the chain doesn't look worn. Is this too
    much?

    I figure I'll buy a new tensioner tomorrow and hope it helps unless
    anyone have any better ideas.

    Pictures:

    Cam chain play:
    http://ulf.cc/domi/mc 062.jpg

    Tensioner:
    http://ulf.cc/domi/mc 055.jpg

    I'm also curious to know where these go, they fell out when I removed
    the cam cover:
    http://ulf.cc/domi/mc 053.jpg


    Thanks,

    Ulf
     
    camaroz28, Sep 19, 2003
    #1
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  2. camaroz28

    IdaSpode Guest

    They look like they may be locating sleeves, are there some bolt holes
    they conveniently fit into?
    David '03 KTM 200EXC
    djones<at>LSidaho.com
    http://www.motosports-boise.com/rmd
     
    IdaSpode, Sep 19, 2003
    #2
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  3. camaroz28

    Jeff Deeney Guest

    This is as intended. Examine the shaft very carefully. A slight pit or
    indent can be enough to keep it from locking in a particular spot. My
    old XR600 showed very slight wear, but replacing the tensioner fixed
    the same problem you describe.
    Without the tensioner in place, this sounds about right. Make sure
    the block that pushes on the chain isn't too worn. Chances are that
    it was the tensioner mechanism you first mentioned.

    -Jeffrey Deeney- DoD#0498 NCTR UTMA BRC COHVCO AMA
    '99 ATK 260LQ-Stink Wheels '94 XR650L-DreamSickle
    We don't stop riding because we get old, we get old because we stop riding.
     
    Jeff Deeney, Sep 19, 2003
    #3
  4. camaroz28

    camaroz28 Guest

    I remove the tensioner and took it to the store hoping they would have
    an new one in stock, which they did not. Not wanting to be without my
    bike until next week, when the new one should arrive, I put the old one
    back in and put the engine back together.

    However, when staring it back up the noise was gone. First I got really
    exited figuring I had fixed it, but the noise returned after 5-10
    seconds. I assume this was because there was no oil on the axle which
    made the tensioner grab better, thus keeping the chain stretched. Then
    after the 5-10 seconds it started slipping due to the oil.

    Hopefully the new one will grab even when it's oily... :)
    Ulf
     
    camaroz28, Sep 21, 2003
    #4
  5. camaroz28

    camaroz28 Guest

    Right on! Thanks. :)
    Ulf
     
    camaroz28, Sep 21, 2003
    #5
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