The highest idle known to man... VF700F

Discussion in '1st & 2nd Generation 1983-1989' started by Jimbob, Jun 15, 2019.

  1. Jimbob

    Jimbob New Member

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    Ok, so bike is back together but damn is my idle high. From start, no choke, starts first time and idle sits at about 3.5/4K nice and steady. Sounds great but not sure I should be running a 4K idle. I removed and refitted the carbs again (which have had new jets/seals/springs) but the same result. I’ve tried a squirt bottle of water around the new intake rubber pipes and nothing changes. Air is getting in somewhere, but I’ve not a clue where to start. Ideas please?
     
  2. Jimbob

    Jimbob New Member

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  3. NorcalBoy

    NorcalBoy Member

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    How much freeplay do you have in the cables at the grip?
     
  4. squirrelman

    squirrelman Member

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    bad carb synch could be the problem or incorrect float setting. as NCB says, be sure throttle cables have some slack.
     
  5. Jimbob

    Jimbob New Member

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    Cables have slack, floats look within tolerance and so far no air leaks. Can only think that fuel screws are incorrect. Set to 2 1/2 turns and 3 turns out, only makes things worse. Set to almost zero and the bike isles at 1300rpm. So I guess something is wrong with the fuel delivery?!
     
  6. squirrelman

    squirrelman Member

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    if you can't shut down any cylinder by screwing in the idle mix screw, it must be getting fuel from somewhere else.......like a leaky float needle or internal crack or fuckedup (or wrong) mixture screw. sure you're not missing an O-ring on the mix screw or that idle speed adjustment screw is all the way backed out ?
     
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  7. Jimbob

    Jimbob New Member

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    Ok, so I pulled and stripped the carbs again. Nothing looks out of place, all jets, needles and rubbers in place, all the mix screws are new and have new o rings on them
     
  8. sixdog

    sixdog Member

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    Once, many moons ago , one of my carb sync screws came off the little perch it sits on. I hope I explained it correctly......
     
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