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Valve clearence XJ700X

Discussion in 'XJ Technical Chat' started by MaxRodax, Sep 9, 2017.

  1. xHondaHack

    xHondaHack Active Member Premium Member

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    If you need to set up the clearance on an "out of spec" one, look to go near the maximum clearance on the spec.
    That way as they wear, and when the clearances get tighter, you'll have a little more buffer before they have no clearance and cause loss of compression and burnt valves.

    Tony
     
  2. Bradstrac

    Bradstrac New Member

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    Thanks Tony! That was my initial thought, to get closer to the max tolerance for that reason but wasn't sure if that was a good thing to do.
     
  3. Quixote

    Quixote Active Member

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    One other tip: measure the old and new shims with a micrometer, don't assume that the numbers are right.
     
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  4. xHondaHack

    xHondaHack Active Member Premium Member

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    +1 on measuring the shims.
     
  5. Bradstrac

    Bradstrac New Member

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    Work never ends :) I have micrometer, but how do measure them? I have to measure from where the valve seats to the top of the shim, correct?
     
  6. XJ550H

    XJ550H Well-Known Member Premium Member

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  7. k-moe

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

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    You measure the thickness of the shim, flat to flat.
     
  8. Bradstrac

    Bradstrac New Member

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    I have the under bucket shims, would I measure them tge same?
     
  9. Timbox

    Timbox Well-Known Member

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    You will need something like this, but it will have to fit inside the cap to determine the thickens. Still flat to flat but you will have to avoid the cap portion. The pic is just an example of what you can use.
     

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  10. Bradstrac

    Bradstrac New Member

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    That's what I'm having a problem with, micrometer is too big to fit inside of the shim.
     
  11. Timbox

    Timbox Well-Known Member

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    You can get a small screw or something that will fit into the bottom of it. That screw or what ever you use will be a constant measurement. Use that part to measure all the shims and it should work out. Even a carb float pin or something similar to fit in there. Just use the same thing for each shim.

    Hope that helps.
     
  12. XJ550H

    XJ550H Well-Known Member Premium Member

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    yes measure total height for over bucket shims


    for the x shims I think you need a spacer like in the photo below or a ball bearing
    after seeing the shims on the x web site they are marked just like over bucket shims
     
    Last edited: May 19, 2019
  13. XJ550H

    XJ550H Well-Known Member Premium Member

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    or like this the spacer shown is like a bolt with shaft cut down (but not a bolt) to insert inside a ball bearing can be used

    you could measure a known size and subtract the excess 0r shim thickness to give you the number
    [​IMG]
     
    Last edited: May 19, 2019
  14. Bradstrac

    Bradstrac New Member

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    Awesome guys! Thank you for all your help! As you can probably tell, I have never done something like this. I really appreciate all the help.
     
  15. MattiThundrrr

    MattiThundrrr Not a guru

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    Brag, brag, brag...;)
     
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  16. XJ550H

    XJ550H Well-Known Member Premium Member

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  17. xHondaHack

    xHondaHack Active Member Premium Member

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    With the micrometer that I have, it required a small screw to get inside the cup, (to sit on the underside of the shim where it rests on top of the valve) and you likely have to do the same to get the proper measurement.

    After snugging it down on the screw, that's where I set the "0" setting on the micrometer. Then you'll have the proper measurement on the shim. Some may be a thousandth or two off of the markings, but some markings may have worn off over time as well. You can use a very fine permanent marker in that case so you can mark and organize what you have, then use the chart for the shims you will need.

    I know it's a pain to do twice, but I always recheck them after doing the initial swap.

    Also, mark down all the shim sizes for each valve position after your done, that way you'll have a reference of what shim is on each one for the next time, or if you sell the bike the next owner will appreciate having that info.

    Tony
     
  18. Bradstrac

    Bradstrac New Member

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    This is exactly what I did and a good thing too! One of my exhaust shims state 195 on it but is actually a 192, would have put me real lost to being out of spec. It was just the one though all other 19 were good :)
     
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