What is this hose on a 1999 VFR?

Discussion in '5th Generation 1998-2001' started by DBnR, Jun 8, 2018.

  1. DBnR

    DBnR New Member

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    Hi all!

    I recently purchased a VFR. Today I was fiddling around with it and noticed this under the tank:

    IMG_20180609_113719.jpg

    Based on the repair manual I believe the blocked up hose should be connected to the nipple but I'm not sure.

    I remember the seller mentioned something about this but I don't remember what it was. Should I connect it up again and what might be the reason why it's disconnected?


    Cheers!
     
  2. GreginDenver

    GreginDenver New Member

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    That's just somebody who realized he's way, way smarter than all of those Honda vehicle engineers put together. There's lot's of that type around. Apparently they can do complex fluid dynamics equations in their head (don't even need a pencil and a scrap of paper). And the results of their amazing mental gymnastics tells them that the VFR800's airbox will achieve a resonate frequency just fine throughout the engine's entire rev-range without needing to rely on anything as obviously stupid as a dual length intake tract.
     
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  3. DBnR

    DBnR New Member

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    Well I reconnected the hose and went for a ride. Seems the same so I guess it's ok :wheelie:
     
  4. Lint

    Lint Member

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    I absolute couldn't tell a difference with it connected nor disconnected. Additionally, I have seen a dyno somewhere on these here interwebs that showed there was no discernable difference with it either way.

    From my own personal experience with the 2005 I used to own, it made the bike rideable around town. The off idle throttle was horrible, total light switch, until I disconnected it. HUGE difference.

    On my 1999, no difference. I think it may actually still be hooked up. Been a while since I lifted the tank.
     
  5. Terry Smith

    Terry Smith Member

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    With the flapper disconnected, you get more intake noise but no more performance. Tried both ways, mine is now connected.
     
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