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Thread: Keihin cvk 40 issues

  1. #16
    A Bit Bored mala's Avatar
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    Default Re: Keihin cvk 40 issues


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    All good on the manifold.

    So its carb to bits this weekend.
    will be checking fuel feed from tank first as defo either short on fuel or too much air.
    I can pop the cam cover off just to check valve timing -engine was rebuilt about 200 miles ago so you never know.

    Did around 40 miles on it yesterday in the vain hope that a run would help....nope.

  2. #17
    A Bit Bored mala's Avatar
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    Default Re: Keihin cvk 40 issues

    Many carb bits scattered over dinner table.
    Main jet was wrong size so some progress.
    Rest seems in very good fettle and in spec with the workshop manual.

    Good news.

    All horse power fully restored on the test run.

    Bad news.

    Still takes forever to drop to idle.
    It is like having about 5% throttle open which is crap on upshifts and not cool when trying to pull at the pub.

    Unless the great collective can help I will be looking for a replacement carb out of the beer money which is not good.

  3. #18
    Should Get Out More maccecht's Avatar
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    Default Re: Keihin cvk 40 issues

    Did you soak it in coke partially blocked drillings will cause this as it can obstruct the airways and it will be like having the choke partially stuck.

  4. #19
    A Bit Bored mala's Avatar
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    Default Re: Keihin cvk 40 issues

    Quote Originally Posted by maccecht View Post
    Did you soak it in coke partially blocked drillings will cause this as it can obstruct the airways and it will be like having the choke partially stuck.
    No Coke yet.

    Ultrasonic cleaner.

    I am getting worn out with this simple issue.

  5. #20
    A Bit Bored mala's Avatar
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    Default Re: Keihin cvk 40 issues

    Why do I still get tickover if any blokages

  6. #21
    At Work Pugwash's Avatar
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    Default Re: Keihin cvk 40 issues

    Try taking the carb slide return springs out and stretching them a little bit, and at the same time make sure that a previous owner hasn't creatively re-routed the throttle cable, introducing a bit of extra friction. Some three in one down the throttle end of the cable probably wouldnt hurt either. Simple things first, then start to worry if they don't fix it.

  7. #22
    Should Get Out More maccecht's Avatar
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    Default Re: Keihin cvk 40 issues

    Quote Originally Posted by mala View Post
    No Coke yet.

    Ultrasonic cleaner.

    I am getting worn out with this simple issue.
    Because tickover is on the pilot circuit. All those little drillings in your carbs need to be perfectly clean. For the sake of 3 quids worth of cheap Tesco coke what have you got to loose.

  8. #23
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    Default Re: Keihin cvk 40 issues

    Quote Originally Posted by Pugwash View Post
    Try taking the carb slide return springs out and stretching them a little bit, and at the same time make sure that a previous owner hasn't creatively re-routed the throttle cable, introducing a bit of extra friction. Some three in one down the throttle end of the cable probably wouldnt hurt either. Simple things first, then start to worry if they don't fix it.
    Cables are fine.
    Has pull to return and they go to the stops.

    Thanks anyway

  9. #24
    A Bit Bored mala's Avatar
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    Default Re: Keihin cvk 40 issues

    Quote Originally Posted by maccecht View Post
    Because tickover is on the pilot circuit. All those little drillings in your carbs need to be perfectly clean. For the sake of 3 quids worth of cheap Tesco coke what have you got to loose.
    Tickover is fine.

    Just takes forever to get there.

    I worry about the coke.

    needed for rum.

  10. #25
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    Default Re: Keihin cvk 40 issues

    am thinking the butterfly is knackered and no easy fix.

    Removal involves removing a pressed cover that looks like it is there for life.

  11. #26
    Should Get Out More maccecht's Avatar
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    Default Re: Keihin cvk 40 issues

    Quote Originally Posted by mala View Post
    No Coke yet.

    Ultrasonic cleaner.

    I am getting worn out with this simple issue.
    Screws are peened over do not touch. I now give up and good luck

  12. #27
    Should Get Out More Julian_Boolean's Avatar
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    Default Re: Keihin cvk 40 issues

    It's an air leak, causes exactly the symptoms your describing, you need to replace the rubber between the carb and the head, you might get away with sealing with glue, but it won't last.

    Cradley Heath are your best bet in the UK for old Kawasaki parts, if they haven't got it try CMSNL but the postage is expensive.

    Or if your still having problems pay someone to fix it.

    Sent from my SM-T560 using Tapatalk

  13. #28
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    Default Re: Keihin cvk 40 issues

    Quote Originally Posted by Julian_Boolean View Post
    It's an air leak, causes exactly the symptoms your describing, you need to replace the rubber between the carb and the head, you might get away with sealing with glue, but it won't last.

    Cradley Heath are your best bet in the UK for old Kawasaki parts, if they haven't got it try CMSNL but the postage is expensive.

    Or if your still having problems pay someone to fix it.

    Sent from my SM-T560 using Tapatalk

    Very tempted to have a fix rather than a new carb.
    Last owner replaced manifold so is very shiny and without leaks.

    I did buy it of Ebay so can,t complain.

  14. #29
    Should Get Out More Julian_Boolean's Avatar
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    Default Re: Keihin cvk 40 issues

    There's a KLR600 on Facebook that runs for 1300, it's in Scotland but is advertised on East Anglia Bike Bargains

    Another cause of your symptoms can be float height too high

    Sent from my SM-T560 using Tapatalk

  15. #30
    Should Get Out More DefTrap's Avatar
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    Default Re: Keihin cvk 40 issues

    You can check the diaphragms by sticking your finger through the hole, pushing it fully up, and releasing.
    They should return smoothly and both at the same rate.

    If they don't, worth investigating for holes or the previous owner may just have fitted them badly.

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