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New engine sound (see video)

Discussion in 'XJ Technical Chat' started by Eddie Swedlund, Jun 23, 2019.

  1. Eddie Swedlund

    Eddie Swedlund New Member

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    Recently my 82 xj650 started making distinct thump (or tick) that seems to be coming from single cylinder or manifold. I did valve clearances about 1,000 miles ago and recently had carbs cleaned. Can anybody decipher from the video?

     
    Eddie Swedlund, Jun 23, 2019
    #1
    Rickard S likes this.
  2. Timbox

    Timbox Well-Known Member Premium Member

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    For me I would have to hear the before and after sounds. The sound of a sewing machine is normal. When is the last time you check and adjusted the valves?
     
    Timbox, Jun 23, 2019
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  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Check for exhaust leaks. Probably at the crossover
     
    k-moe, Jun 23, 2019
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  4. Rickard S

    Rickard S New Member

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    Sounds exactly as my 750 XJ Seca from 1982. I have adjusted valv clearance, new carborator rubbers and renovation of all carbs
     
    Rickard S, Jun 24, 2019
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  5. ColoradoDan

    ColoradoDan Active Member

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    A distinct tick or slap sound is a side effect of properly set valve clearances. You get the valves loosened (they get tighter with use) and end up with a bit of a slap. It could be that or exhaust as k-moe suggested.
     
    ColoradoDan, Jun 24, 2019
    #5

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