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"Plug Chop" - RPM or speed?

Discussion in 'XJ Technical Chat' started by baytonemus, Aug 6, 2012.

  1. baytonemus

    baytonemus Member

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    I'm curious as to whether it's necessary to get the bike running at highway speed in order to do the traditional "plug chop" test. Will running at high RPM in a lower gear get the same result?
     
    baytonemus, Aug 6, 2012
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  2. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Only sort of, because the load characteristics are different.

    Running at a higher RPM in a lower gear will give you better results than you'd get with NO load, however.
     
    bigfitz52, Aug 6, 2012
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  3. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    If a person were to do "Plug Chops" for the purpose of adjusting the Pilot Jet, then the bike should be run under a load condition that is "off-idle", but not engaging the Main Jet or Slider-Needle.

    This would be about 2MM of "twist", maintained for about a minute, then kill and coast. I think 50 MPH in top gear would do it.

    Other throttle settings would test other parts of the carb.
     
    TIMEtoRIDE, Aug 6, 2012
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  4. Thrasher

    Thrasher Member

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    Never heard of doing a plug chop for the pilot jet. That's not the common way to find the right setting for the pilot jet.
     
    Thrasher, Aug 6, 2012
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  5. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    But it's the only thing that's easily adjustable, and it affects drivability.
     
    TIMEtoRIDE, Aug 6, 2012
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