Proper way to set vacuum adjuster on hypercharger
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  1. #1


    Proper way to set vacuum adjuster on hypercharger

    I'm looking for the proper way to set the vacuum adjustment on a Kuryakyn hypercharger. Currently, the butterflies flutter at idle, but when I crack the throttle, they open slightly and close again. Will the wind force hold them open while traveling, or is an adjustment needed? Unfortunatley, no instructions came with the unit.

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  3. #2
    In The Zone
    My Bike(s)
    2009 Yamaha Vstar 950
    Not sure of an adjustment-might be the screw on the side, but the vacuum of the engine sucks the butterflies shut and the spring holds it open, so when cruising the butterflies are about 3/4 the way shut

    Anybody correct me if Im wrong
    ------------This is why mine are not hooked up-dont have to worry about it

    M50 Manual

    "Democracy is two wolves and a lamb voting on what to have for lunch.
    Liberty is a well-armed lamb contesting the vote!"
    -Benjamin Franklin-

  4. #3

    Well, apparantly the screw on the back of the hypercharger does not adjust vacuum pressure as I had thought, rather it sets the minimum position of the butterflies. After extensive searching online, it seems the easiest way to adjust the HC is to:
    1- hold the butterflies closed
    2- turn screw in until you feel it hit the rod
    3- adjust so butterflies stand about 1/8 inch open

    I tried it, and it seemed to help, so I wanted to pass it along in case someone else needed to know.


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