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Do I need new Valve Shims Checked Clearance. Time for work!

Discussion in 'XJ Technical Chat' started by Metal_Bob, May 30, 2012.

  1. Metal_Bob

    Metal_Bob Active Member

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    Just looking for a quick yes or no on each value. I have service manual.

    Intake 0.11~0.15mm
    Exhaust 0.16~0.20mm

    I'm not sure which is which but I'll list my numbers as #1 Front (towards front of bike) and #2 Rear.

    1Front 14
    1Rear 14

    2Front 17
    2Rear 14

    3Front 16
    3Rear 14

    4Front 17
    4Rear 10

    I didn't have time to check each shim or properly research the clearances. However I can read this post at work (1X-1G coverage :evil: ).

    Thanks in advance!

    FYI: I had to remove my Windjammer Fairing bracket to remove the cover and my left "crash" bar to remove the side cover. Things never go as fast as planned/hoped. At least the cover popped right off (but hung up on some of the wiring).
     
    Metal_Bob, May 30, 2012
    #1
  2. dubyaohohdee

    dubyaohohdee Member

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    Front is exhaust, rear intake.
    You only have 2 that are out of spec and not by much.

    The following are out of spec:

    1Exhaust
    4Intake
     
    dubyaohohdee, May 30, 2012
    #2
  3. RickCoMatic

    RickCoMatic Well-Known Member

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    RickCoMatic, May 30, 2012
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  4. tskaz

    tskaz Active Member

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    That's what I got too. Down a shim on each.
     
    tskaz, May 30, 2012
    #4
  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    agreed
     
    bigfitz52, May 30, 2012
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  6. Metal_Bob

    Metal_Bob Active Member

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    Apparently I only need to buy one shim. Is it a BAD idea to open up all 8 gaps on purpose to extend the valve gap time? Or just check/replace them again in 3-5K miles?

    1 Exhaust 14mm - 270 --> 265
    1 Intake 14mm - 285

    2 Exhaust 17mm - 270
    2 Intake 14mm - 290

    3 Exhaust 16mm - 270??
    (99% sure but very hard to read and forgot to buy a micrometer - But it is in spec anyways)
    3 Intake 14mm - 290

    4 Exhaust 17mm - 270
    4 Intake 10mm - 275 --> 270
    That means I can re-use the 1Exhaust shim.
     
    Metal_Bob, Jun 2, 2012
    #6
  7. jmilliken

    jmilliken Well-Known Member

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    keep them in spec. Valves aren't opening at the right times....
     
    jmilliken, Jun 2, 2012
    #7
  8. RickCoMatic

    RickCoMatic Well-Known Member

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    You maintain Valve Clearances within Specs for two reasons:

    1) Tight Valves will fail to Cool and eventually become burned needing to be replaced.
    When they let gasses escape; backfiring and missing ensue.

    2) Too Loose and you risk throwing a shim. A Dangerous situation.

    Because the Design is SOLID ... Not HYDRAULIC, ... the Clearances need to be MONITORED at Regular Intervals.
     
    RickCoMatic, Jun 4, 2012
    #8
  9. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    The cam lobe profile is designed with "ramps" that smoothly accelerate the valvetrain.
    When drawn on a graph, it looks like a SINE wave.
    If the valves were set too loose, the ramps go unused, and the cam crashes into the valvetrain.

    Just suggesting a work-around. Anyone who can't remove the side cover can roll the motor over by putting the bike in 5th gear and pulling on the tire (plugs out)
     
    TIMEtoRIDE, Jun 4, 2012
    #9

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