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Ticking sound from left valve couver

Discussion in 'XJ Technical Chat' started by Rickard S, Jun 23, 2019.

  1. Rickard S

    Rickard S New Member

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    Hi. I have refurbished an old Yamaha XJ to almost brand new. Replaced gaskets, cleaned and changed all in the carborators, adjusted valve clearance etc.. Sometimes but not always I can hear a small ticking sound from left side of engine at the valve cover. Only when engine has been hot. It start around 3000rpm and disappear when 4000rpm and sometimes I can hear it at Lowe rpm. Sometimes during the ride it also completely disapear. The engine runs and sound nice - just as a sewing machine and smooth. What could it be and should I be worried?. Yamaha XJ 750 Seca from 1982. Just over 60 000km?.

    Thanks in advance
     
    Rickard S, Jun 23, 2019
    #1
  2. k-moe

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

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    That's normal.
    Some of the 650 and 750 cam caps allowed a bit more cam endplay than Yamaha intended. The result is that noise.
    Somwehere around here is an old thread with a copy of the TSB. Yamaha's conclusion (which I agree with) is that the endplay is not excessive, and the only result is increased valvetarain noise.
     
    k-moe, Jun 23, 2019
    #2
    ColoradoDan, Jetfixer and Rickard S like this.
  3. Rickard S

    Rickard S New Member

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    Great to hear-thanks for quick reply
     
    Rickard S, Jun 23, 2019
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