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Help ZXR250 idle issues... (another one)

Discussion in 'Kawasaki 250cc In-line 4's' started by DanoHosko, Dec 7, 2019.

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  1. Murdo

    Murdo The Good Doctor Staff Member Contributing Member Ride and Events Crew

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    If your having to use choke all the time then it has an air leak and needs the extra fuel from choking to keep the mixture where the engine will run.
     
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    Murdo, Apr 12, 2020
    #21
  2. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Yeah I'm thinking air leak still too, I've fitted the Litetek kit so that rules out that at least.
    I guess replace all the vacuum hoses is next step

    Maybe intake funnels but they look ok as far as i could see
     
    DanoHosko, Apr 12, 2020
    #22
  3. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Can you test the compression?
     
    maelstrom, Apr 12, 2020
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  4. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    I haven't yet, a friend suggested that i should too so I'll probably get a tester
     
    DanoHosko, Apr 12, 2020
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  5. ShaneP

    ShaneP Well-Known Member

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    If it ran fine at first then you needed choke, you mightn't be get fuel to the carbies. Taps or floats, perhaps?
     
    ShaneP, Apr 13, 2020
    #25
  6. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    When you say taps you mean fuel tap?

    The carbs would have been bone dry when i connected up, set the new tap to prime for a few minutes first and then put to on (checked it opened on vacuum and it did)
    I did set the float heights as per the manual but not sure how accurate that method is :D

    How long do the bowls take to empty? I probably ran it about 30 seconds off choke, then maybe 90 seconds trying with choke altogether
     
    Last edited: Apr 13, 2020
    DanoHosko, Apr 13, 2020
    #26
  7. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Couple videos
    First one is when it idled at 2k with no choke, lasted 30-45 seconds tops




    Second one, choke on revs jump to 5k, choke off they drop to like 1k then dies a couple seconds later (adjusting the idle screw made no difference)
    Carb butterflies were bench synched with feeler gauge only so far
    Mixture screws all set to 2.5 turns out

     
    DanoHosko, Apr 13, 2020
    #27
  8. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Ok, todays diagnosis seems like its definitely sucking in air, looks like the intake funnels
    Sprayed some carb cleaner onto the intake funnels while it was running and the revs jumped etc
     
    Last edited: Apr 13, 2020
    DanoHosko, Apr 13, 2020
    #28
  9. jmw76

    jmw76 Well-Known Member

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    Did you spray into or onto? To check for leaks at the intake adaptors (connection between carb and head) the usual technique is to spray water onto the outside of the adaptors while the bike is running. If it is sucking in air around the adaptors the engine not will change.
     
    jmw76, Apr 13, 2020
    #29
  10. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Ah i sprayed carb cleaner onto the adapters and it made the revs jump up (my mate said if its sucking in air then the carb cleaner on the intakes will make the revs change)

    Sorry yeah onto, typo on previous post
     
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    DanoHosko, Apr 13, 2020
    #30
  11. jmw76

    jmw76 Well-Known Member

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    yep. Sounds like an air leak at the adaptors to me. You should be able to isolate which one(s) are leaking.
     
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    jmw76, Apr 13, 2020
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  12. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    GreyImport, Apr 13, 2020
    #32
  13. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    DanoHosko, Apr 13, 2020
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  14. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    To be honest, they almost look brand new to me apart from a couple suspicious marks, but not perished to me, tried to bend a little see if any holes appear around the top but nothing

    I will say, one wasnt very tight at all, and again somes tried to glue them down with silicone sealant .


    I might clean them up and try again, am i right saying no sealant at all?

    DSC_0336.JPG DSC_0337.JPG DSC_0338.JPG DSC_0340.JPG DSC_0339.JPG DSC_0341.JPG
     
    DanoHosko, Apr 14, 2020
    #34
  15. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    All that sealant isnt going to help seal them one bit .... thats a rubber o ring and thats wat seals them when tightened down .... clean all that junk off and any left on the engine side
    the orings dont look completely squashed flat so maybe they could be replacements

    when ready to refit , smear a little rubber grease on the o rings and on the top inside where the carby sits ... makes it easier for carby in and carby out

    rubber grease.jpg
     
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    Last edited: Apr 14, 2020
    GreyImport, Apr 14, 2020
    #35
  16. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Completely agree bud, whoever bodged this bike up the first must of gone through a couple tubes of sealant haha

    Yeah I'll give them a clean up and hope that it works first off, not sure about the orings, are they replaceable orings or is it the way the rubber has been machined?
    (Feels like they are solid in place so part of the rubber or siliconed in...)
     
    DanoHosko, Apr 15, 2020
    #36
  17. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Apr 15, 2020
    #37
  18. jmw76

    jmw76 Well-Known Member

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    Replace the o rings. Not worth the hassle of trying to reuse. Make sure the adaptors are actually flat where they mate with the head. The o ring will take small irregularities but it is not a gap filler. I have successfully made up custom aluminium adaptors and sealed with silicone to the head. But they were non flexible and machined dead flat.
     
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    jmw76, Apr 15, 2020
    #38
  19. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Yep sounds reasonable to me bud! Thanks for that
     
    DanoHosko, Apr 15, 2020
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  20. DanoHosko

    DanoHosko Well-Known Member Premium Member

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    Ah yeah fair enough, my mate has suggested that someone's potentially siliconed them as a temporary/bodgy fix
     
    DanoHosko, Apr 15, 2020
    #40
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