Vacuum line

Discussion in 'General VFR Discussions' started by tonythegasfitter, Jul 1, 2015.

  1. tonythegasfitter

    tonythegasfitter New Member

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    Anyone know why someone would do this to the vacuum line?
    [​IMG]

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    tonythegasfitter, Jul 1, 2015


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  2. tonythegasfitter

    tonythegasfitter New Member

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    I just bought the bike and was checking the air filter when I found it.

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    tonythegasfitter, Jul 1, 2015


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  3. Mark919

    Mark919 New Member

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    Disconnecting and plugging the vacuum line is the usual way to deactivate the flapper valve. Many folks like to do this modification. I'm not a fan myself though.
     
    Mark919, Jul 1, 2015


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  4. tonythegasfitter

    tonythegasfitter New Member

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    Sorry I'm so ignorant but what does that accomplish?

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    tonythegasfitter, Jul 1, 2015


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  5. Mark919

    Mark919 New Member

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    If you do a search on this the other VFR forum site you can find hours of reading on the flapper valve mod. The service manual has a very complete description of the valve function.
    Most folks feel the flapper system restricts air flow and is there to just meet emissions testing. i've done this mod on other bikes and have been satisfied with the change. Not so with the VFR. For me i felt disabling the valve caused an off-idle engine stumble. Reconnecting the valve seemed to make it better. Again, every bike may be different - your results may vary. But it's easy to play with and do which ever seems to work for your bike.
     
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  6. tonythegasfitter

    tonythegasfitter New Member

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    Cool thanks so much I did search around on the mod.

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    tonythegasfitter, Jul 1, 2015


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