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Across: Everything seems fine, but stalling in neutral

Discussion in 'Suzuki 250cc In-line 4's' started by sarahb, Feb 28, 2016.

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  1. sarahb

    sarahb Well-Known Member

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    Bike is running well and revving smoothly and evenly (relatively, best since I've had her) but new issue.. even once the bike is warmed up and I'm going on 100km ride when i come to stop at lights and change into neutral the bike stalls. i have to give it a little bit of choke to start

    initially when i go to start the bike for the first time it starts pretty well, in neutral, but then i ride off, turn the first couple of corners and as soon as i have to give way it stalls. and this stalling continues for the full ride unless i get a chance to go into neutral and pull the choke out a little bit before stopping - alternatively i can use the throttle revs a bit

    i tried the mix screws. turned them OUT a further half circle. after that i couldn't even get the bike to start. i didn't try for ages but i tried a few times enough to make it clear it wasn't helping turning them open. so then i turned them a full turn in (so half a turn in from original position) and the bike started well and i went for a 50km ride with them there and it seemed to be a nice mix. nice and smooth. nice sound. no little backfires as it had been, but the stalling issue was exactly the same.

    as always, ideas much appreciated.
     
    sarahb, Feb 28, 2016
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  2. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    You havnt mentioned the idle knob ..... :D

    across idle.jpg
     
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    GreyImport, Feb 28, 2016
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  3. Joker

    Joker See "about me" for contact details. Contributing Member

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    Hmm. Could be a few things.

    - Have you checked your pilot screw holes for blockages?
    - What about air leaks in carb boots etc?
    - snip your leads off 10mm in case the electrical contact isn't great at low RPM.
    - check your diaphragms for correct operation.
    - Idle position as per Grey.

    When you start it, is choke on? Do you continue to ride with choke on? Try that, does it stall with the choke on at idle?
     
    Joker, Feb 28, 2016
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  4. murdman87

    murdman87 Well-Known Member

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    Idle speed should be 1600 +\- 100 rpm.
    adjust that with the knob greyimport pointed out (once the bike is warm)
    after that check everything joker said.
    but idle screw would be the first thing i'd do.
     
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    murdman87, Feb 28, 2016
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  5. sarahb

    sarahb Well-Known Member

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    the idle knob doesn't seem to do anything? i'm turning it both ways and the revs don't change.

    when the bike is warm and with the knob fully open and no choke the bike stalls.

    ive found i can ride with the choke on a little all the time as a work around
     
    sarahb, Feb 29, 2016
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  6. murdman87

    murdman87 Well-Known Member

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    Turn it clockwise should raise the revs. try turning a few full turns. I'd say that is your problem if it's not currently doing anything.
    Flop the tank/boot back and look at where it connects just under where the throttle cable goes to the carbs. You should see that end moving as you do the knob up.
     
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    murdman87, Feb 29, 2016
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  7. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    It may be that the cable is screwed right out of the linkage at the carby end

    Ha! .... too quick for me ..... as @murdman87 says ..... it should be moving the throttle linkage which operates the butterflys in the carbs .... do it without the bike running just to see if its actually doing anything
     
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    GreyImport, Feb 29, 2016
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  8. Joker

    Joker See "about me" for contact details. Contributing Member

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    If you're riding with the choke on a little "all the time" as a workaround it's clearly a fuel related issue. Adjusting the idle knob as suggested is another way of doing the same thing as the choke - making the fuel/air mix richer.

    Assuming you haven't been messing with the knob and the bike has sort of "suddenly" started having this problem... Probably something simple like idle circuit jet blockage (or partial blockage), diaphragm operation or something similar.

    If you decide to dig a little deeper that's where I'd be looking. That does not detract from the fact that messing with the main idle will probably be a quick fix (for a while at least).
     
    Joker, Feb 29, 2016
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  9. sarahb

    sarahb Well-Known Member

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    i can get to the top of the carbys ok but the thought of having to take out the whole thing... i just don't think i'm capable.. getting them back in with the airbox connection in tact etc was such a nightmare last time and i had someone with me much more competent then.

    for the price of getting someone else to do it... i may as well get a new bike :(
     
    sarahb, Feb 29, 2016
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  10. murdman87

    murdman87 Well-Known Member

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    I've had my carbs in and out a few times now, you develop a knack for it haha.

    Joker makes a good point too, when did the problem start? Idle speed screw probably isn't the culprit if this is a sudden occurrence.
    If it's been doing it since you had the carbs out last though would be more likely.

    If you're near me I'm happy to lend a hand getting them in and out. I'm by no means and expert though. This is my first bike and I've only had it since December.
     
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    murdman87, Feb 29, 2016
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  11. sarahb

    sarahb Well-Known Member

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    thanks thats very kind alas i'm in canberra. from memory there's a problem with the neck of my air box and its not air tight once its been squashed back in.. we patched it up last time but then that all got ripped putting it back in.

    maybe i'll have to bite the bullet.. or maybe i'll just drive around with the choke on a little. tomorrow i'll flip the boot and have a look anyway.

    thanks all
     
    sarahb, Feb 29, 2016
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  12. sarahb

    sarahb Well-Known Member

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    clockwise when i'm on the bike or when i'm off the bike looking at it?

    or maybe - toward the front tyre or the back tyre?

    thanks
     
    sarahb, Mar 1, 2016
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  13. sarahb

    sarahb Well-Known Member

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    yes the idle screw is hanging loose.. any tips on how to reconnect?
     
    sarahb, Mar 1, 2016
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  14. sarahb

    sarahb Well-Known Member

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    From the diagram above I can't really see where it is supposed to go..


    Sent from my iPhone using Tapatalk
     
    sarahb, Mar 1, 2016
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  15. murdman87

    murdman87 Well-Known Member

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    Would be easiest with the carbs out I'd say. Here's a few pics may help.

    Note my float bowls were removed for that pic.
     

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    murdman87, Mar 1, 2016
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  16. murdman87

    murdman87 Well-Known Member

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    I'd say minimum you'd have to remove the airbox to get in there.

    Unless you have really tiny hands, or the toolkit of a keyhole surgeon.
     
    murdman87, Mar 1, 2016
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  17. sarahb

    sarahb Well-Known Member

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    Ignore the above its back in, albeit without a washer


    Sent from my iPhone using Tapatalk
     
    sarahb, Mar 1, 2016
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  18. sarahb

    sarahb Well-Known Member

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    So I'm trying to adjust to the correct position. The bike is fully warm. No choke. Start it. It's running. Adjust the idle screw. Sitting at 3000rv for ten seconds. Fifteen seconds. Then the revs just drop. Shouldn't they hold?


    Sent from my iPhone using Tapatalk
     
    sarahb, Mar 1, 2016
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  19. murdman87

    murdman87 Well-Known Member

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    Should hold where you set it.
     
    murdman87, Mar 1, 2016
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  20. kiffsta

    kiffsta Senior Member

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    if its revving up, then you might have an air leak, check your carby boots for cracks and make sure the carbs are on properly
     
    kiffsta, Mar 1, 2016
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