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Thread: Air adjustment screw, needle sharp or flat tip?

  1. #1

    Air adjustment screw, needle sharp or flat tip?

    This is for the adjustment screw located underside next to the floating bowl. Wondering if it's difference between XT/TT/SR screws.
    Have seen before that previous owner have used to much force and broken of the tip inside the carb.

  2. #2
    Senior Member MadMax's Avatar
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    This is the SR screw, sharp tip as you can see http://www.cmsnl.com/yamaha-sr500-19.../#.V-ZyPNQrKt8

    Late model TT screw looks like this http://www.cmsnl.com/yamaha-tt500-of.../#.V-ZzC9QrKt8, not interchangeable as you can see.

    This https://web.archive.org/web/20121028.../SR/mikuni.htm is helpful .

    Max

  3. #3
    Senior Member chunk's Avatar
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    I bought an SR with the same problem, it's a very fine tip. I was lucky and able to drill the broken piece out without any damage to the carburetor body. I think i used a #80 drill bit. Good luck in getting it out. Chunk.

  4. #4
    Quote Originally Posted by MadMax View Post
    This is the SR screw, sharp tip as you can see http://www.cmsnl.com/yamaha-sr500-19.../#.V-ZyPNQrKt8

    Late model TT screw looks like this http://www.cmsnl.com/yamaha-tt500-of.../#.V-ZzC9QrKt8, not interchangeable as you can see.

    This https://web.archive.org/web/20121028.../SR/mikuni.htm is helpful .

    Max
    Thank you, just what I needed to know.

  5. #5
    Quote Originally Posted by chunk View Post
    I bought an SR with the same problem, it's a very fine tip. I was lucky and able to drill the broken piece out without any damage to the carburetor body. I think i used a #80 drill bit. Good luck in getting it out. Chunk.
    I think the tip is allready out. But i know from last year when I bought a XS650 with the same problem that it can be quite a job to fix the problem...

  6. #6
    Senior Member MadMax's Avatar
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    Quote Originally Posted by Mach III View Post
    I think the tip is allready out. But i know from last year when I bought a XS650 with the same problem that it can be quite a job to fix the problem...
    Been there and got the T shirt with a Yam XS1100, ended up fitting FJ1200 carbs because one was a write-off.

  7. #7
    Junior Member yamahadood's Avatar
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    thought I would chime in with my limited knowledge having just went through similar thing. talked to an old timer when buying the new carb and he reccomended this to get the broken tip off:

    "brake a safety pin tip off and file it flat so it can fit in the carb opening, remove all parts (that means all parts) from carb body and put in oven at 300F for 10min. use the safety pin to push the tip out, should slip out with a little work."

    Anyway if anyone tries that method let us know if it works!

    yamahdood

  8. #8
    Quote Originally Posted by yamahadood View Post
    thought I would chime in with my limited knowledge having just went through similar thing. talked to an old timer when buying the new carb and he reccomended this to get the broken tip off:

    "brake a safety pin tip off and file it flat so it can fit in the carb opening, remove all parts (that means all parts) from carb body and put in oven at 300F for 10min. use the safety pin to push the tip out, should slip out with a little work."

    Anyway if anyone tries that method let us know if it works!

    yamahdood
    Well, I've just found that I have this situation. New diaphragms worked wonders for the old carb, but I couldn't get the idle down below ~1800 RPM. The air valve needle didn't seem to have any effect, and when I took it out I could see that the tip was bent. I compared it to the old one that was removed when the carb kit was installed and that one didn't have a tip on it.

    So, that tip is in the carb body and I'm going to try the "oven baked" method unless someone has a better idea...

  9. #9
    Senior Member gcrank1's Avatar
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    Id try the probe before heating (handling a hot item for a procedure hasnt gone well for me...), it just might come out with a little persuasion. Ya gotta know when to stop, though, if it just aint workin.
    '81 Yamaha SR500 Caff Racer
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    In all things maintain your uprightness lest the road reach up and smite thee

  10. #10
    Yeah, I'll create whatever tool looks to work best and give it a go before heating it, and if I do heat it I'll plan ahead for what I'll need to try it then. I hope this works; these are listing for ~$100 on ebay and I just spent more than that on the diaphragms. Oh, yeah, all that would have to be removed!

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