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Check my valve shim math

Discussion in 'XJ Technical Chat' started by maverickbr77, May 22, 2011.

  1. maverickbr77

    maverickbr77 Member

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    1981 seca 750

    Intake
    Cylinder 1 clearance .305 shim 285 need shim 300
    Cylinder 2 clearance .330 shim 285 need shim 305
    Cylinder 3 clearance .127 in spec shim 275
    Cylinder 4 clearance .203 shim 285 need shim 290

    Exhaust
    Cylinder 1 clearance .152 shim 270 need shim 265
    Cylinder 2 clearance .152 shim 275 need shim 270
    Cylinder 4 clearance .127 shim 270 need shim 265
    Cylinder 1 clearance .152 shim 265 need shim 260

    Also where is the best place to find shims for these.
     
    maverickbr77, May 22, 2011
    #1
  2. wizard

    wizard Active Member

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    wizard, May 22, 2011
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  3. tskaz

    tskaz Active Member

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    Numbers look good.

    Chacal has them.
    If you have a generous Yami dealer near you they may swap them out for ya.
     
    tskaz, May 22, 2011
    #3
  4. BillB

    BillB Active Member

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    Might be a generous forum member who can send you the right ones.
     
    BillB, May 22, 2011
    #4
  5. KrS14

    KrS14 Active Member

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    I'd be little suspect of something, when 2 of your intakes measure .30
     
    KrS14, May 23, 2011
    #5
  6. maverickbr77

    maverickbr77 Member

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    Just had the engine apart valves and cams look good. Anything else I should be looking at.
     
    maverickbr77, May 23, 2011
    #6
  7. waldo

    waldo Member

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    Maverick did you type the intakes in wrong? When the valves wear we use thinner shims you are going thicker, did you change the cam?
     
    waldo, May 23, 2011
    #7
  8. maverickbr77

    maverickbr77 Member

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    those are the correct numbers

    here is everything I can think of on it.

    No changes to the valves or cams, everything torqued to spec on reassembly, 18k miles, taken apart and together following haynes, didn't check before tear down, torn down due to seized rings on cylinder 2 or 3 (can't remember right now which), only spun by hand for timing check and clearance measurements since reassembly with no problems, gaps checked with my shiny new feeler gauges.
     
    maverickbr77, May 23, 2011
    #8
  9. waldo

    waldo Member

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    PO must have done it then did you ride the bike before you had to rebuild top end?
     
    waldo, May 23, 2011
    #9
  10. maverickbr77

    maverickbr77 Member

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    nope I haven't run it at all yet. came with carbs off. Po got scared when he saw one of the slides seized in the carb.

    Ps. I knew the bike had some issues that is why I got it. I wanted something to tear apart and see if I could fix it.
     
    maverickbr77, May 23, 2011
    #10
  11. waldo

    waldo Member

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    Looks like your on the right track PO probably screwed up the valve shims on the intakes and bike would not make any power if it would even run at all. Good Luck
     
    waldo, May 24, 2011
    #11

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