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Double-Checking

Discussion in 'XJ Technical Chat' started by tjb2of3, Sep 24, 2010.

  1. tjb2of3

    tjb2of3 Member

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    I just finished checking my valve clearances as per Fitz's how-to, and got these results:

    Cylinder 1:
    Intake Clearance: .051, Shim: 275
    Exhaust Clearance: .051, Shim: 265

    Cylinder 2:
    Intake Clearance: .076, Shim: 265
    Exhaust Clearance: .127, Shim: 260

    Cylinder 3:
    Intake Clearance: .063, Shim: 270
    Exhaust Clearance: .127, Shim: 265

    Cylinder 4:
    Intake Clearance: .038, Shim: 275
    Exhaust Clearance: .127, Shim: 265

    So, if I'm reading the chart right, I would need the following shims:
    Cylinder 1:
    Intake: 265
    Exhaust: 250

    Cylinder 2:
    Intake: 260
    Exhaust: 255

    Cylinder 3:
    Intake: 265
    Exhaust: 260

    Cylinder 4:
    Intake: 265
    Exhaust: 260

    Is this correct? This is my first time ever doing this, so I figured I should double check my work with some of you more experienced guys.

    Also, I noticed that all of my intake valves need the same size shim as are already installed in its corresponding exhaust valves. Can I use the ones I have, or should I get 8 new shims?
     
    tjb2of3, Sep 24, 2010
    #1
  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Looks right on cursory inspection without checking against the chart.

    Those intakes were getting a tad tight, eh? How many miles, I'm curious?

    The debate over reusing shims, either from other bikes or from your own bike in different cylinders, is long and acrimonious.

    Do a forum search, it's come down to a real pi**ing contest at times.

    Me, personally, am in the "it's a 30-year old motor what's it worth not having to rebuild it" camp. We have "cheap insurance" on our flag.

    Others will say it's fine and have even gone so far as to establish "shim pools." Philistines, I say.

    Research the debate and make up your own mind. Chacal carries brand new shims at half Yamaha's price.
     
    bigfitz52, Sep 24, 2010
    #2
  3. tjb2of3

    tjb2of3 Member

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    The bike has about 35,000 miles, I think. I replaced the speedometer/tach with an original one from ebay (my trip odometer stopped working as soon as I got the bike running, go figure), so I don't know exactly what it is. It sure seems old though...
     
    tjb2of3, Sep 24, 2010
    #3
  4. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Ah, OK, good thing you checked. They HAD to have been adjusted at some point, with those miles they would have been dead tight by now if not.

    Wait until you see how much more "grunt" the motor has afterward.
     
    bigfitz52, Sep 24, 2010
    #4

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