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White sweet smelling exhaust

Discussion in 'XJ Technical Chat' started by sybe, Apr 16, 2016.

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  1. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    If a shim clearance is to close, then the shim can ride on the cam. If it's riding on the cam, the valve will be open more than it should. If a valve is open more than it should be, you'll have compression loss. So.....yes , it could.

    I'd get clearances back in spec before tearing an engine down only to find that I should have gotten so shims in spec instead
     
    Last edited: Apr 23, 2016
    hogfiddles, Apr 23, 2016
    #51
  2. sybe

    sybe Active Member

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    Thing is when i swapped out the shim lastnight for 4E and did a compression test it reads at 169 so i am a bit confused how 4e could have such a high compression but also have a compression leak.
     
    sybe, Apr 23, 2016
    #52
  3. sybe

    sybe Active Member

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    The only thing that happened from lastnight to today is i poured some seafoam into the sparkplug hole amd immediately pumped it out. This morning i did another compression test and it was 169...
     
    sybe, Apr 23, 2016
    #53
  4. sybe

    sybe Active Member

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    Just checked the valve and 4e is in spec at .16mm. I am going to try to run it and add sea foram to see if it will clean out some carbon
     
    sybe, Apr 23, 2016
    #54
  5. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    Maybe your gauge wasnt quite tight enough in the plug hole
     
    Last edited: Apr 23, 2016
    hogfiddles, Apr 23, 2016
    #55
  6. k-moe

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

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    Agreed. Run it (Seafoam in the gas this time) an see if you get improvement. A good hard run from midrange to redline, then off the throttle and coast down by about 15 MPH, then back on the throttle hard. That will heat the carbon up, induce some thermal shock when you get back on the throttle hard, and help it to be blown out.
    Do the easy things first.
     
    k-moe, Apr 23, 2016
    #56
    Lightcs1776 likes this.
  7. sybe

    sybe Active Member

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    just came back from a ride and i love this bike! i might just stop stressing and enjoy her.
     
    sybe, Apr 23, 2016
    #57
    Stumplifter, rocs82650, specialk and 3 others like this.
  8. sybe

    sybe Active Member

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    So after riding her for a couple of hours i decided to do the valve and piston ring. I just cant ignore the smoke coming out.

    The one question i do have is, is it possible to do the work while the motor is in the frame?
     
    sybe, Apr 25, 2016
    #58
  9. k-moe

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

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    The entire top end can be removed without touching a single engine mounting bolt.
     
    k-moe, Apr 25, 2016
    #59
  10. sybe

    sybe Active Member

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    Awesome. And that includes the cylinder block?
     
    sybe, Apr 25, 2016
    #60
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