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Xj650 head gasket repair

Discussion in 'XJ Technical Chat' started by Boxcar, Apr 14, 2018.

  1. Boxcar

    Boxcar New Member

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    I own a 1982 Yamaha xj650 just blew head gasket cause somebody decided to overfill my oil and I have no idea what I'm doing so I desperately need help
     
    Boxcar, Apr 14, 2018
    #1
  2. Jetfixer

    Jetfixer Well-Known Member

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    How did you diagnose a blown head gasket? Drain oil , refill and then check for leaks a compression test would tell you more about condition of the head gasket.
     
    Jetfixer, Apr 14, 2018
    #2
    k-moe likes this.
  3. k-moe

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

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    Most head gasket leaks turn out to be valve cover gasket leaks.

    Do as Jetfixer recommends.
     
    k-moe, Apr 14, 2018
    #3
  4. Chitwood

    Chitwood Well-Known Member

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    Also, are you sure it was oil and not full of fuel from a leaking petcock/float valves? I assuming oil change and got carried away refilling but thought I'd ask
     
    Chitwood, Apr 14, 2018
    #4
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  5. Boxcar

    Boxcar New Member

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    It's leaking oil right at the head gasket line even after checking compression washing bike thoroughly it's still a very small leak my oil level hasn't gone down by much but it is definitely fresh oil on the front left side of my engine I have a gasket kit but kinda nervous messing around with the valves
     
    Boxcar, Apr 21, 2018
    #5
  6. XJ550H

    XJ550H Well-Known Member Premium Member

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    could be that your speedo cable is leaking at the head,


    EDIT I mean Tach cable at thead
     
    Last edited: Apr 21, 2018
    XJ550H, Apr 21, 2018
    #6
  7. Boxcar

    Boxcar New Member

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    How do I check that cause my speedo isn't working so idk what's up with it I just cleaned my carbs yesterday
     
    Boxcar, Apr 21, 2018
    #7
  8. Boxcar

    Boxcar New Member

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    My speedometer has never worked since I got the bike do you mean the tachometer or rpm gauge that might be leaking cause I believe my speedometer is connected to my front wheel and the tachometer went on the very front casing or my engine to register the transmission and rpms of motor
     
    Boxcar, Apr 21, 2018
    #8
  9. Boxcar

    Boxcar New Member

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    IMG_20180402_220158.jpg
     

    Attached Files:

    Boxcar, Apr 21, 2018
    #9
  10. XJ550H

    XJ550H Well-Known Member Premium Member

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    sorry I mean the tach cable

    could be valve cover leaking into spark plug area and coming out drains any oil around spark plugs.
    it does look like your head gasket
     
    XJ550H, Apr 21, 2018
    #10
  11. Polock

    Polock Well-Known Member

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    right now stop whatever your doing and get some kroil or 50/50 acetone/atf on those exhaust flange studs. do that every day for a week before you touch then with a wrench.
    they look like trouble to me
     
    Polock, Apr 21, 2018
    #11
  12. Boxcar

    Boxcar New Member

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    The exhaust came off easy
     
    Boxcar, Apr 21, 2018
    #12

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