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Help Spada idle screw

Discussion in 'Honda 250cc Twins' started by spatbent, Feb 4, 2020.

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  1. spatbent

    spatbent Active Member

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    [​IMG]
    Hi there
    I've had this bike for two months it was rough when I got it but gradually getting it sorted out.
    I'm chasing hanging throttle... I've ordered new carb manifold rubbers but how do I adjust these idle screws?
    I'm thinking an easyout and then cutting a slot for a screwdriver.
    Cheers, Andy
    [​IMG] [​IMG]
     
    spatbent, Feb 4, 2020
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  2. spatbent

    spatbent Active Member

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    Damn the pic didn't work.
    Help here?
     
    spatbent, Feb 4, 2020
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  3. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    spada 1.png
     
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    GreyImport, Feb 4, 2020
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  4. spatbent

    spatbent Active Member

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    49485997597_18500eae4a_c.jpg 2020-02-04 002 by Andrew Dixon, on Flickr

    Hope this works
     
    spatbent, Feb 4, 2020
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  5. spatbent

    spatbent Active Member

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    Wow that was fast!
     
    spatbent, Feb 4, 2020
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  6. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Those are your mixture screws. They adjust the amount of fuel supplied by the pilot circuit. Your main idle screw will be a plastic or metal thumb screw either located on the carb where the throttle linkage is, or with a cable to it and the screw down near one of the engine covers.
     
    Linkin, Feb 4, 2020
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  7. Gizziracer

    Gizziracer Well-Known Member Contributing Member

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    Wow, they certainly didnt want any one adjusting those. Looks like they are designed to be adjusted with a specialist tool. Never seen those on a Spada before.They most likely wont be in very tight and have a flat area to get a hold of, I'd be getting a small pair of cheap pliers, grind them down as much as required to fit and just gently turn the screws. Once removed, as you say, cut a slit in the head. I usually find 2 1/2 to 2 3/4 turns out is optimal when tuning these carbs.
     
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    Last edited: Feb 6, 2020
    Gizziracer, Feb 5, 2020
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  8. spatbent

    spatbent Active Member

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    Thankyou
    I'll try it today.
     
    spatbent, Feb 5, 2020
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  9. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    maelstrom, Feb 5, 2020
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  10. spatbent

    spatbent Active Member

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    Thanks for the link I've been using that method for years!
    The reason I originally posted was because I'd not seen an unslotted mixture screw before I guess it was an emissions thing.
    Anyway as Gizziracer noticed from the pic there is a small flat section so I was able to twist them out with small electronics pliers. I screwed them in first to see where they were set.
    There's no springs.
    My manifold rubbers are supposed to lob tomorrow so we'll see what happens with the hanging throttle.
     
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    spatbent, Feb 5, 2020
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  11. Gizziracer

    Gizziracer Well-Known Member Contributing Member

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    The carbs being unbalanced often causes the”hanging up” when decelerating/ snapping the throttle shut.. tuning with vacuume gauges is sometimes the solution here.
     
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    Last edited: Feb 6, 2020
    Gizziracer, Feb 5, 2020
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  12. Murdo

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

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    If there is no springs on your idle mixture screws then what stops them from undoing and changing the mixture settings or falling out?
     
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    Murdo, Feb 5, 2020
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  13. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Section E17 down the bottom of the page
    https://en.impex-jp.com/catalogs/moto/honda/11ky6jj3.html

    Check out part number 6 here, click on the diagram to enlarge it
    Mixture screw, spring, washer, o'ring.

    I suspect someone has forgotten some part's when they reassembled that carby
    No o'ring washer and spring would be letting air come through the mixture screw threads and making it run lean.


    CCF20160517_00031_E-17.png
     
    my67xr, Feb 5, 2020
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  14. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Feb 5, 2020
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  15. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    my67xr, Feb 5, 2020
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  16. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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  17. spatbent

    spatbent Active Member

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    Thanks my67xr for the cool tool pics.
    I put the carbs back on this morning even though only one of the new manifold rubbers turned up.
    I mentioned before there were no springs with the mixture screws... they were still in the carbs doh!
    Along with the teeny washers and o rings. They look fun to replace.
    I warmed it up and then hooked up my diy manometer for the vacuum test and it was way out.
    I got it balanced and the hanging throttle problem seems to have gone away.. thanks again Gizziracer for the tip.
    But adjusting the mixture screws does nothing no matter how much I screw them in or out.
    What should I be looking for here?
    Also does anyone know what the specs for the float level are?
     
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    spatbent, Feb 8, 2020
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  18. Gizziracer

    Gizziracer Well-Known Member Contributing Member

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    Have you tried adjusting both idle needles.. it’s possible for one cylinder to keep the motor running virtually by itself.. keeping the faulty one ticking over and totally masking any adjustments.. also, if the tiny o rings are missing or badly damaged they will have a huge impact on the functionality of the idle mixture screw.. its not difficult to install all the tiny bits in the idle mixture screw.. get them all out of the carb ,, install the spring, washer and o ring on to the screw as per manual / diagram. Then simply screw the screw gently into its housing. Everything should happily press into place.. just go gently as the pointy end of the screw is easily damaged if overtightened.. of course, you could be suffering the other small Japanese motorcycle issue that is possession by a poltergeist! If that’s the case the local catholic priest may be of assistance. , probably busy tomorrow though
     
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    Gizziracer, Feb 8, 2020
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  19. Gizziracer

    Gizziracer Well-Known Member Contributing Member

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    Float height should be 6.8mm
     
    Gizziracer, Feb 8, 2020
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  20. spatbent

    spatbent Active Member

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    Thankyou I'll see how I go.
     
    spatbent, Feb 9, 2020
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