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Petcock Vacuum

Discussion in 'XJ Technical Chat' started by Jerrod Robinson, Apr 7, 2021.

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  1. Franz

    Franz Well-Known Member

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    Franz, Jun 5, 2021
    #81
  2. XJ550H

    XJ550H Well-Known Member Premium Member

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    5K RPM is where the power band starts to come alive.
     
    XJ550H, Jun 5, 2021
    #82
  3. Minimutly

    Minimutly Well-Known Member

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    Flawed logic here I'm afraid. Compression has a minimal effect on power, probably zero until the cork in the bottleneck (the carb) is opened fully - and by that I mean throttle wide and slides fully up...
    Sort the fuelling out, but bear in mind your main jet will not be doing much (if anything) to correct it at 5k. Time to look at different needles maybe?
     
    Minimutly, Jun 6, 2021
    #83
  4. Polock

    Polock Well-Known Member

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    just put it together and ride it. if starts right up and runs good, it'll go fast enough.
     
    Polock, Jun 6, 2021
    #84
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  5. Jerrod Robinson

    Jerrod Robinson Member

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    I was told anything over 100 PSI is acceptable, but you want them within 10 PSI of eachother.
     
    Jerrod Robinson, Jun 14, 2021
    #85
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