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compression test

Discussion in 'XJ Technical Chat' started by mmcgee, May 27, 2013.

  1. mmcgee

    mmcgee Member

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    Do I need to disconnect the igniter box before doing the the test? I seem to remember reading that somewhere...
     
    mmcgee, May 27, 2013
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  2. smokeater

    smokeater Member

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    I just did a test on all four a few hours ago for the first time. I didnt disconnect anything and had no issues. I dont know if my results are skewed because of it but nothing went wrong. But my bike isnt running either
     
    smokeater, May 27, 2013
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  3. Captainkirk

    Captainkirk Member

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    Geez, I hope not. Otherwise I fried mine years ago.... :wink:
     
    Captainkirk, May 27, 2013
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  4. Captainkirk

    Captainkirk Member

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    One thing to remember; with carbs mounted, compression test needs to be performed with the throttle wide open
     
    Captainkirk, May 27, 2013
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  5. moellear

    moellear Member

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    I've always disconnected it before doing the test, but only because Fitz suggested it. I'm not sure why either...
     
    moellear, May 28, 2013
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  6. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Because you're not supposed to "light up" the TCI if there are no spark plugs (or you didn't ground the HT leads) as you risk cooking it.

    The manual(s) have you ground the plug wires. It's easier to just unplug the TCI.
     
    bigfitz52, May 28, 2013
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