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    New needle needed?

    Hi everyone, today I started taking apart the bs30 carbs from a 1980 Gs250t. It was running very poorly. When I was taking the carbs out I noticed that the intake boots were very cracked out. I have found replacements. I then noticed that the jet needle was also wore. I've never seen anything like it. It is a 5CHT40 needle that I can't find anywhere. Is the needle still good to use? Thanks!
    Attached Files
    1980 Gs250T- Passed from father to son, also my first build.

    #2
    I can't help you with that, but I'd be checking the needle jet also
    1978 GS 1000 (since new)
    1979 GS 1000 (The Fridge, superbike replica project)
    1978 GS 1000 (parts)
    1981 GS 850 (anyone want a project?)
    1981 GPZ 550 (backroad screamer)
    1970 450 Mk IIID (THUMP!)
    2007 DRz 400S
    1999 ATK 490ES
    1994 DR 350SES

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      #3
      Originally posted by Mr.Vroom View Post
      Hi everyone, today I started taking apart the bs30 carbs from a 1980 Gs250t. It was running very poorly. When I was taking the carbs out I noticed that the intake boots were very cracked out. I have found replacements. I then noticed that the jet needle was also wore. I've never seen anything like it. It is a 5CHT40 needle that I can't find anywhere. Is the needle still good to use? Thanks!
      Vibration takes its toll.
      the Needle should be harder than the brass jet.
      1983 GS 550 LD
      2009 BMW K1300s

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        #4
        Should I just hand polish the needle with some brasso? Also, one of the carbs is missing the metal ball that is by the diaphragm. How important is that? the other one is very slightly smaller than 1/8 of an inch. The ball is 3.16 mm and 1/ 8 inch is 3.175 mm. Would a new 1/8 inch ball work?
        1980 Gs250T- Passed from father to son, also my first build.

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          #5
          I've just found that Cruzin' Image makes a kit (I know using kits is less than ideal, but these are the only parts I can find that might work) for the the GSX250E. I would think that the needles would be the same. It is the same bike, just different styling and market.
          1980 Gs250T- Passed from father to son, also my first build.

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            #6
            I'd run it. Worst case, it will run a little rich. GS bikes are known for running lean, so who knows, it may run better.

            Ed

            To measure is to know.

            Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

            Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

            Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

            KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

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