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V9 Roamer 2017 Idle speed adjustment

Discussion in 'V7/V85/V9 Chat & Tech' started by V9 Roamer, Jul 17, 2019.

  1. V9 Roamer

    V9 Roamer Just got it firing!

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    How can I lower the idle speed at my V9? It's around 1.400 rpm.
    Thanks.
     
  2. vagrant

    vagrant High Miler GT Contributor

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    on a real tach it's probably closer to 1300. you can't and shouldn't if you could. they need that speed to charge and keep the oil pressure up.
     
    john zibell likes this.
  3. kiwi dave

    kiwi dave GT Reference

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    Straight from the Service Station manual.

    upload_2019-7-19_11-46-2.png
     
    Redcad likes this.
  4. Godfrey

    Godfrey High Miler GT Famiglia

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    Remember that the throttle on your V9 Roamer is operated 'by wire' ... the throttle cable pulls a lever attached to a potentiometer which tells the computer how much throttle you want. The computer opens and closes the throttle at your behest. Similarly, the computer controls the idle speed.

    The only way to adjust the idle speed, other than to maladjust the throttle cables to make it too high, is to change the ECU's programming (or 'map') with new parameters for the idle speed.

    The idle speed is set by the manufacturer based on a number of factors: idle speed operating emissions, oil flow through the engine, charge rate needs during stops in traffic, etc. The set speed of 1250 +/-100 rpm is just fine; the tachometer isn't all that accurate at that point in the range and often reads a hair high. Hook it up to a diagnostic computer and you'll most likely see that it sits nicely right in the range.
     

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