I think it's called a hunting idle?

Discussion in 'Mechanics Garage' started by VFR Love, May 27, 2014.

  1. VFR Love

    VFR Love New Member

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    Hey my VFR tach needle at idle tends to sway back and forth.

    It's a relatively steady swaying of the tach needle an eighth of an inch or so. It stops pulsating anywhere above cracking the throttle.

    What are the possible culprits?

    Pc3 didn't change anything. Nor did new plugs. I'm assuming it's the idle valves out of synch. Bike has 30k on odo.

    It's been doing it as long as I've owned it (1 year).


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  2. Outboard John

    Outboard John New Member

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    Not sure if you meant the throttle body butterflies (sync) but that is what leapt to my mind.
    John
     
  3. TNRabbit

    TNRabbit New Member

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    I disconnected the PAIR system & my missing & idle fluctuations STOPPED COMPLETELY. Idles rock solid at 1200 now.
     
  4. V4toTour

    V4toTour New Member

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    Could be valve clearances and then throttle sync, but I doubt it. Probably the PAIR system mentioned above
     
  5. VFR Love

    VFR Love New Member

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    PAIR is blocked already. Still have the wires connected though for the solenoid. Flapper is still connected.

    Valves?? Yikes!!


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  6. MrSleep

    MrSleep New Member

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    Clean the throttle bodies including blowing out the starter valves with carb cleaner. I've got the same milage and cleaning TB's smoothed out my idle. If the starter valves have never been synced then that may need to done if the idle doesn't smooth out after cleaning.
     
  7. Carolina06HondaRider

    Carolina06HondaRider New Member

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    Most motors fluctuate at idle... Unless this seems excessive? Sounds almost like a non-issue but maybe I'm not understanding completely?
     
  8. VFR Love

    VFR Love New Member

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    I've seen video of VFRs idling without the degree of fluctuation mine has. (1/8-1/4" of swing at needle tip).

    I previously tried seafoam in the gas and dribbling it into open throttle venturis so I'll have to go back and make sure I hit the smaller apertures on the starter valves.

    I also sprayed throttle body cleaner but again I probably missed the small starter valves.


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