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SLIGHT KNOCKING SOUND WHEN DRIVING

Discussion in 'XJ Technical Chat' started by Vargy61, Aug 16, 2010.

  1. Vargy61

    Vargy61 New Member

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    Hi all! Ok, So my 81 XJ750 is making a knocking sound that sounds like its coming from somewhere down low on the bike (cant isolate the sound) but the hitch is that it only happens if I am accelerating. If I am in neutral or have the clutch pulled in I can rev the engine as high as i want and the bike sounds very healthy, but once its in gear and I start to get get between 2500 and 3500 rpm while still applying throttle the knock starts and wont let up until i let up on the throttle. Any Ideas? Thanks!
     
    Vargy61, Aug 16, 2010
    #1
  2. clipperskipper

    clipperskipper Member

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    Sounds like a worn bearing in the carden shaft.
     
    clipperskipper, Aug 16, 2010
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  3. iwingameover

    iwingameover Active Member

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    yeah sounds like your U joint. Peel the boot back and have a look.
     
    iwingameover, Aug 16, 2010
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