another bb!!!
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Thread: another bb!!!

  1. #1

    Member #
    38023
    Join Date
    Jul 16 2019
    Posts
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    another bb!!!

    hi guys
    i like these bikes
    i saw non runner carb version up for grab in germany and got it for a very low price with only 23000 km
    as you might imagine with that low mileage there is a catch
    the exterior is very good but the carbs are well and truly bunged up

    the guy selling it had a local old skool jap bike garage taken off the carbs and the butterfly's were solid with varnish
    so i loaded the bike in my van and took it home ( 450 km ) and once home proceeded to strip the carbs ( did this on my nr 1 bb before )
    indeed they are pretty c--p
    using turpentine ( good for melting varnish ) i have cleaned most of the accessible parts and part cleaned the screw in jets( as best i can still leaving them to soak over night ) and the choke plungers and idle bypass screws
    the butterfly's are now free and the body is clean and shiny
    under the intake bell is a plastic plate with o ring type seal
    under it is a series of brass stubs with holes
    the outer ones there are 3 plus one blind hole that goes to a re-circulation valve two others i have opened up with a fine needle
    on the inner two there are 4 in a staggered pattern
    i am guessing that these are used to deliver a common vacuum to the other parts of the carb perhaps to actuate the slide?
    i have managed to open up 3 of the 4 but there is one where the needle bottoms out ( maybe too fine a hole ?? )
    so my question
    what is the 4th one for? is it an issue if i cant un bung it ?

    once the carbs have soaked overnight with the turps ill tbey clean them up and send them for a couple of hours of ultrasound cleaning
    i did this on other less b---ered up carbs and they came out ok
    with the ultrasound finish off what i started or is it a c--p shoot as to success , in which case i need to find a back up set ....
    m
    look forward to the oracles teaching me...

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  3. #2

    Member #
    2343
    Bike(s)
    2K Titanium, 85 V65 Sabre (Totalled but saved me)
    Join Date
    Sep 25 2007
    Location
    Arizona
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    Re: another bb!!!

    The ultrasonic should clear them up fine.
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  4. #3

    Member #
    38023
    Join Date
    Jul 16 2019
    Posts
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    Re: another bb!!!

    so last evening and part of the morning i took the carbs apart and they were ghastly to look at
    all the jets were corroded and covered in varnish
    the butterflies were frozen and corroded
    the slides were frozen and covered in varnish
    so off i started cleaning everything with solvents and got most of the things looking decent
    the only thing i cant get right is the tiny meter hole in the low end jet its open but only partly
    i put the whole thing and it started right off on full choke
    warned it up and rode it
    its missing on nr 1 or 2 and once you get into the secondary and main get its goes like a rocket
    so ill take off the carbs again and take out the low end jets and probably order some replacements
    ill need to change the infeed t piece o rings as its weeping fuel on one side
    anyway i pretty happy that i could do a lazarus with those bunged up carbs..
    cheers
    paul

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  6. #4

    Member #
    2343
    Bike(s)
    2K Titanium, 85 V65 Sabre (Totalled but saved me)
    Join Date
    Sep 25 2007
    Location
    Arizona
    Posts
    7,197
    Liked
    1862 times

    Re: another bb!!!

    cbr
    If you can get some of this try soaking them in it. We used it in scho0l and man it'll lean out anything that's in there. Just don't get it on anything plastic for a extended period of time.

    https://www.partsvu.com/yamalube-com...All%20Products
    Route 191 formerly Route 666 Some say that this section of the
    road has 1100 curves in 95 miles.

  7. #5

    Member #
    37265
    Bike(s)
    017 1290SDGT & 05 CBR1100XX
    Join Date
    Mar 21 2019
    Location
    Brisbane, Australia
    Posts
    95
    Liked
    22 times

    Re: another bb!!!

    If you have access to an air compressor, blow the jets clean with a strong blast of air. I'm unfamiliar with BB carbs, but very familiar with FZR1000 carbs...... used to clean them every 10k kms and blow clean all jets/holes. Check the needle and seats (on the floats) - they should spring freely as the floats move up/down - may need new ones if they are solid as they can't be dismantled.

    I had that varnish in a set of replacement carbs and it can take a couple of goes to get them fully clean.... but I wasn't aware of ultrasound way back in the noughtie's .

    Good news getting it running again..... more cleaning will help get it perfect...... a total strip is best but then you'll need to reset the mixtures, synchro the carbs for best tune.


 

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