That's not a fuel mixture screw.
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Thread: That's not a fuel mixture screw.

  1. #1
    Senior Member Trail Woman's Avatar
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    Exclamation That's not a fuel mixture screw.

    So did ya guess what I did?

    Yep...I drilled out the wrong part of my carburetor. I thought I identified the welch plug covering it, but I found something else under the plug. Fortunately I stopped drilling before I saw brass. When I pulled the plug out, a C-clip came with it which scared me. A C-clip and a green coated metal shaft in the center.I turned the green center and it flips open the throttle and springs back....not a screw. It appears to be the other side of the throttle. Everything seems to be working fine. Did I do any real damage? Is there anything I should do to correct this? Or forget about it and drill the right spot?

  2. #2
    rbm
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    Senior Member rbm's Avatar
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    Pic,?

  3. #3
    Senior Member Trail Woman's Avatar
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    Quote Originally Posted by rbm View Post
    Pic,?
    teikei-mv-28-manual-choke-plunger_4-1000x1000.jpg

    Here's a carb for sake of description...I drilled out the plug under the choke. I'm sure it's the other side of the throttle cable shaft, and guess it's a c-clip held plug, used as a stop for assembly. I'm thinking I should grease the bottom only and JB weld putty the hole closed?

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    Senior Member Fred's Avatar
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    Ooops.
    Trail Woman, Not sure if we will ever let you live this one down. You could have easily said "Somebody I know drilled out this plug out ..." And we never would have been the wiser.
    Actually honesty pays a good reward plus future dividends.
    Your lub and glue repair plan sounds good. I would first look to see if the cir-clip was needed to limit axial end play that could bind the shaft somehow. Replicate something to limit green center movement if binding might otherwise occur. Not nearly as criticall a mistake as some of us have made.
    2003 TW200 "Betty Boop"
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  6. #5
    Senior Member Trail Woman's Avatar
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    That's a relief to hear Fred.

    I poked and prodded at it and ran it up and down the road. It seems like the parts are all secure and operating what appears to be 100%.

    I locked the shop and I'm not too proud of how deep I drilled it to take pictures but I'm just glad I stopped when I did. I drilled into the green coated shaft which is how I know it's only green coating, but I can clean up the wound and seal it. Sometimes I'm not as afraid to mod things as I should be.

    It freaked me out at first because the stock carb is not cheap and I wasn't too crazy about getting into jetting an aftermarket carb to save money.

  7. #6
    Senior Member Smitty Blackstone's Avatar
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    It is called an "adventure" right?

    A bit of lube and JB weld will fix it.
    Trail Woman and Fred like this.

  8. #7
    Super Moderator JerseyJeeper's Avatar
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    Quote Originally Posted by Fred View Post
    if the cir-clip was needed to limit axial end play that could bind the shaft somehow.
    The only thing I would add is to make sure the butterfly aka "throttle plate" is held centered and not rubbing the edges of the carburetors throat. Any metal worn off from rubbing will get sucked right into the cylinder. Maybe that piece you drilled out held the shaft and consequently the throttle plate centered in the throat centered so it doesn't rub the sides. I can't say without seeing what your working with first hand.. I know you're smart enough to identify if it's an issue once you look close. Interested in hearing the outcome I am..
    Husqvarna TE300i Fuel Injected 2-Stroke 2019
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  9. #8
    Senior Member Fred's Avatar
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    Hey, what do I know?
    You do know where to drill now though?

    Just look at it as one more customized feature in you bike. I'ld give it your quick repair, finish adjusting the mixture screw, then go back to getting that new XR200 ready to rip.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
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  10. #9
    Senior Member Trail Woman's Avatar
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    Quote Originally Posted by Fred View Post
    You do know where to drill now though?
    It looks like it's underneath. On the engine manifold end? I'm making sure to confirm this time around. It's not easy to find online. It looks like you loosen up the carb and rotate it to access the bottom.

  11. #10
    Super Moderator JerseyJeeper's Avatar
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    yep..
    Trail Woman likes this.
    Husqvarna TE300i Fuel Injected 2-Stroke 2019
    Yamaha XT225 - 1999 Serow
    Yamaha TW200Z - 2010
    Yamaha BW200 Electric Start! - 1986
    Yamaha TTR225R - 2003
    Husqvarna 701 Enduro - 2017
    Kawasaki Prairie 650 - 2002

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