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Help Suzuki Across Fuel Line Air Lock

Discussion in 'Suzuki 250cc In-line 4's' started by Jethalter, Feb 17, 2019.

  1. Jethalter

    Jethalter Active Member Premium Member

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    Sweet, what years were they all from ??? also what colours are they ??
    My Original is Silver, My donor was Dark Grey and not pre drilled
     
  2. Cbuzz

    Cbuzz Well-Known Member Dirty Wheel Club

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    Silver & dark gray. No idea what year bikes they are from. Had them for 10+ years (quite likely 1990 across).
     
  3. Jethalter

    Jethalter Active Member Premium Member

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    So with the carbs im building to changeover, I soda blasted them today, then ultrasonically cleaned them and all the necessary bits. So clean and shiny :-D

    Still waiting on all new seals and such to put them together.
    All of the old slides have chipped bottoms, another set of stuffed carbs i have all have good slides with no damage so they are the donors.
     
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  4. Jethalter

    Jethalter Active Member Premium Member

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    so got my gasket set today, assembled the carbies, new float needles and seats (set them correctly). put them in the bike, pouring fuel out the rh carb overflow tube on the bowl. sigh. have to take them back out tomorrow and recheck them all.
     
  5. Cbuzz

    Cbuzz Well-Known Member Dirty Wheel Club

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    Check the float needle seal before you put them back together by blowing into the fuel line with the floats/needles installed & in closed position. Spray a bit of wd40 around the needles & make sure they are sealing properly.

    Also, try give the carb a tap with a screwdriver as sometimes the floats stick open if you fill them from a dry state until you give them a tap.
     
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  6. Jethalter

    Jethalter Active Member Premium Member

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    Think its all fixed now, Just in the testing and triple check phase but so far so good.

    So i'll post up some pics of the rebuild on them. Mostly just dirty vs clean. Floats were set at 20.25mm with the new float needle and seats (as close to 20.50mm i could get).

    Dirty Carbs :

    IMG20190306153022.jpg
    IMG20190306153035.jpg

    Clean Carbs :

    IMG20190306193311.jpg
    IMG20190306193322.jpg

    One Carb Built :

    IMG20190313183037.jpg

    2nd Carb Being Built :

    IMG20190313184211.jpg

    Assembled Carbs :

    IMG20190313191602.jpg
    IMG20190313191618.jpg


    So here was the fuel leak problem after fitting them to the bike, I overlooked the tang on the float, not the needle one but the other one. It was limiting the needle to seal shut when the float rises. Not sure how it happened cause i wouldn't have been able to set it properly, but anyway its fixed now.
    Carb's have been fitted, tuned, balanced and so far so good.

    Bad Tang :
    IMG20190314095513.jpg

    Good Tang :
    IMG20190314095523.jpg
     
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  7. Andych

    Andych Well-Known Member Premium Member

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    Geez they came up nicely.
    Without reading back through did you Soda Blast them or just give them a real good clean.
    Nice to see those lovely Green seals in there.
    Best stuff on the market


    Sent from my iPhone using Tapatalk Pro
     
  8. Jethalter

    Jethalter Active Member Premium Member

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    Yeah, they were soda blasted then ultrasonically cleaned.
     
  9. Andych

    Andych Well-Known Member Premium Member

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    Nice job


    Sent from my iPhone using Tapatalk Pro
     
  10. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Good job. I have to say that media blasting carburettors is not a very good idea unless you seal every orifice first. Having said that ultrasonic cleaning should dissolve any soda that is blocking orifices and that is not something you can do with any other medium.
     
  11. Jethalter

    Jethalter Active Member Premium Member

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    The ultrasonic @ 60c is key to get any of the soda medium out, the temp helps immensely.
    I wouldn't do them any other way.
    Sometimes the carbs have to be soda blasted, then ultrasonic'd to loosen any really stubborn stuff, then blasted away and final ultrasonic clean. It really just depends how bad the carbs are and how old the grim is on them.
    That being said, the soda is very gentle on the carbs and the ultrasonic cleaning solution i use is quite good at cleaning but not strong enough to remove some things and won't damage the aluminum on the carbs.
    I'm still tinkering with the right mix, but i found a nice gentle balance at the moment. I do have a completely stuffed un-rebuildable across RH carb that i might try a really strong mix and see how it does.
     
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  12. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    I have blasted (aluminium oxide) and painted carbs but I go to great lengths to seal them up first, tedious business.
    KehinRebuild_Plugged.jpg
     
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  13. Jethalter

    Jethalter Active Member Premium Member

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    Exact same thing i had to do when i did my gt550 carbs to paint them. tedious as you said, time consuming but well worth the end result.
     
  14. kiffsta

    kiffsta Administrator Staff Member Dirty Wheel Club Contributing Member

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    I know what you mean
     
  15. Andych

    Andych Well-Known Member Premium Member

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    So what is this special mix that you are perfecting?? I am keen to find out as would be a few others with Ultrasonic cleaners.
     
  16. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    I use a generous amount of CT-18 superwash and hot water in the ultrasonic cleaner at work, though it is a very small unit, hardly fits 1 carb body but good for the small bits
     
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  17. Andych

    Andych Well-Known Member Premium Member

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    Strong CT18 mix at elevated temps isnt good for Aluminium... it is a fine line where it all turns to Sh*t...
     
  18. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    Using some super duper mix in an ultrasonic is horse crap .... I tried all sorts of combos and after reading and testing I went back to a few drops of dishwashing liquid .... works just fine

    And its all about water temp and prep ... look up the correct procedure for using an ultrasonic cleaner and how it actually does wat it does
     
  19. Andych

    Andych Well-Known Member Premium Member

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    That is why I asked as the best results I have had are from exactly that combo. Using Fairy dishwashing detergent I think.. the one that really gets greasy frypans etc clean. I will nearly always try to clean any oils, grease etc in my cleaning tank with the white spirit but the Ultrasonic does a great job.. especially after cleaning parts with Threebond (for carbys at least).
     
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  20. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    Yep, the dishwashing liquid is the surfactant.
     

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