86 vfr 700 now has a hiss/tick and mists fuel?

Discussion in '1st & 2nd Generation 1983-1989' started by pivotpoint, Mar 8, 2018.

  1. pivotpoint

    pivotpoint New Member

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    I have had this 86 vfr for a couple years now and its always had this tick. It sounded like it was sucking in air somewhere and sometimes it would come out of the exhaust (right side only). It would slightly drop the rpm then pick right back up. This also happens while cruising at freeway speeds. If I hold a speed it will act like its not getting fuel and kind of chug a bit. If I want to speed up it might take a second then I have all the power I need. I have looked for it and never could find it. I figured I would find it one day.

    Today is that day (well a couple days ago). When warming the bike up with the choke engaged at around 2k rpm it will shoot a mist of fuel out under the carbs (in that little gap thats there). It turned out it came from a hose that is attached to the right side of the bike. It looks like it might be from some smog hook up. When I plug the hose the bike runs like it normally did from the above paragraph.

    My question is: what is the best option here? I want to obviously get rid of it spitting this mist of fuel. Do I need to get smog equipment to make it happy? Or is there some workaround that I didn't see on the forums?
     
  2. Captain 80s

    Captain 80s Member

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    Post some pics if you can to help identify what area/part you are talking about.

    These bikes can be rid of the smog equipment pretty easily if it is indeed a CA bike, I've done it on 4 now. It's just nice to not have all that shit there and lose some weight. The hardest part people seem to have is understanding the difference between a vacuum line and a vent line when eliminating/plugging items.
     
  3. pivotpoint

    pivotpoint New Member

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    Here is a video of the problem that I took a couple of days ago. Fast forward to about 15 sec and you can see and hear the hiccup.

    Here is the hose that mists out when it hiccups. It is on the right side of the bike, the other end hooks right around the thermostat housing. There is a nipple that sticks out that the hose is connected to. I hope that made sense. I will go and get some better pictures 64427.jpeg
     
  4. Captain 80s

    Captain 80s Member

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    Looks like a vacuum line for the smog equipment and it prob is giving you an intake leak. That's prob when the bike is "sneezing".
    The nipple is on the head right below the carbs?
     
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  5. pivotpoint

    pivotpoint New Member

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    20180308_152632.jpg Captain 80's yeah its exactly that one. I have it plugged into itself right now and its zip tied because it was blowing off the nipple and I couldn't find my hose clamps. Anyways, should I just leave it plugged into itself or is there a better way?
     
  6. Captain 80s

    Captain 80s Member

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    You're gonna have to go through your vacuum lines and t fittings and inspect for damage. Those plaatic Ts get brittle with age and can crack. Typically the original hose that goes to that location is a pretty tight fit too. Perhaps somebody had been switching stuff around.

    Without knowing exactly what that hose is going to, hard to say if you can just plug it. It may affect something else and give more / diffetent issues.
     
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  7. pivotpoint

    pivotpoint New Member

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    Alright so the best thing is to plug it up. There is no other end to it. It comes off the head ( my last picture) and it goes to the picture where it is in my hand. There are no other places for it to go. There is not any smog things on it, it is how I got it. I have it plugged into the T end. I just looped it.

    Thanks for your help Captain 80s I really appreciate it!
     
  8. Terry Smith

    Terry Smith Member

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    It's been a few decades since I owned a VFR700, but I recall there was a charcoal canister for gas tank vapors, as well as a PAIR system on these. I don't think there is a vacuum valve in the fuel petcock, so the most likely thing would be that the vacuum takeoff at the inlet manifold was to purge the canister. If so I would just get a rubber vacuum cap from an auto parts store and plug the nipple with that.
     
  9. squirrelman

    squirrelman Member

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    Or you could use the proper screw (like on the other 3 cylinders) to seal the vacuum hole and remove the hose entirely. :rolleyes:
     
    Last edited: Mar 8, 2018
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