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81 xj550 maxim- valve lifter to cam lobe clearance

Discussion in 'XJ Technical Chat' started by MJCXJ550, Mar 25, 2019.

  1. MJCXJ550

    MJCXJ550 New Member

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    In reading information on clearance it is saying that these bikes get "tight" over time with the clearance decreasing versus having it increase. Looking for info on how this happens, I am thinking wear on the shims/valve tips and carbon buildup on the valves would increase the clearance?
     
    MJCXJ550, Mar 25, 2019
    #1
  2. k-moe

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

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    The valve seats get slowly tapped deeper into the head.
    The shims do not wear.
    Carbon buildup is minimal, unless something else is very wrong.
     
    k-moe, Mar 25, 2019
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  3. XJ550H

    XJ550H Well-Known Member Premium Member

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    the shim bucket sits directly on top of the valve stem end.

    the cam lobe presses down on the shim pushing valve open then releases

    then just as K-moe said above.


    valve.PNG
     
    Last edited: Mar 26, 2019
    XJ550H, Mar 26, 2019
    #3

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