Stock air mixture screw was ALL the way in!
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Thread: Stock air mixture screw was ALL the way in!

  1. #1
    Senior Member Ricklesss's Avatar
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    Stock air mixture screw was ALL the way in!

    So this is on my new to me, 2000 TW that I've been working on for the last few weeks.
    I finally got around to drilling out the brass plug on my air mixture screw today.
    Was extremely surprised to find that it was ALL the way screwed in!
    I unscrewed it to 2.25 or 2.5 turns out. I know they're known to be tuned lean from the factor
    but WOW!
    I'll be starting it hopefully tomorrow, and we'll see how she runs!
    RicklesssS in Oregon

  2. #2
    Senior Member Fred's Avatar
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    Have you pulled your plug to get a baseline feeling for just how lean it has been running before today? How many miles on the 2000? Curious how it ran and whether rest of carb settings are stock.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  3. #3
    Senior Member Ricklesss's Avatar
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    Hi Fred,
    The only time I've heard it run was when I bought it, but the muffler was rusted out, so we quickly shut it down!
    It only has 980 miles on it, and the guy said it ran good. I dunno' though.
    The original plug looked fine, and the jets in the carb are all stock, #40 pilot, and #114 main.
    All I can think is that when my drill bit went though the brass plug, it turned the mixture screw in?
    I'll take a better look at it and see if it looks like the drill bit touched it.

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  5. #4
    Senior Member Fred's Avatar
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    Wow, only 980 miles. You found a winner. Sounds like if it had been lean from mixture screw setting it was not excessive. Time to go have fun on it and rack up some miles.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  6. #5
    Senior Member Hikerglenn's Avatar
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    That's what I was thinking, you may have snagged the screw with the drill bit upon punching through the plug- it's easy to do if you don't use a stop on the bit.
    "Right's right -even if nobody's doing it and wrong's wrong -even if everybody's doing it"

  7. #6
    Senior Member oilhed's Avatar
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    Where is this brass plug?

    Can someone post a pic.
    Mark Flanagan
    aka OILHED
    2014 Yamaha TW200 &
    2001 BMW R1150GS

  8. #7
    Senior Member scotti158's Avatar
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    Quote Originally Posted by Hikerglenn View Post
    That's what I was thinking, you may have snagged the screw with the drill bit upon punching through the plug- it's easy to do if you don't use a stop on the bit.
    I've seen this done a number of times. Look at the mixture screw, I bet you can see where the drill bit caught it.
    kj7687 likes this.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  9. #8
    Senior Member Fred's Avatar
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    No picture oilhed, sorry. However this plug which conceals the mixture screw is on the bottom of the main carburetor casting, not the float chamber cover, at the front beneath where the intake manifold attaches. Plug is brass colored and approx. 1/4" diameter. If you loosen the carb boot clamps the carb can be carefully rotated to reveal underside of carb and this plug. This info pertains to the new style carb, I do not know about the older style.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  10. #9
    Junior Member gutterboy2ca's Avatar
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    Quote Originally Posted by Fred View Post
    No picture oilhed, sorry. However this plug which conceals the mixture screw is on the bottom of the main carburetor casting, not the float chamber cover, at the front beneath where the intake manifold attaches. Plug is brass colored and approx. 1/4" diameter. If you loosen the carb boot clamps the carb can be carefully rotated to reveal underside of carb and this plug. This info pertains to the new style carb, I do not know about the older style.
    Hope this Helps, this is off my XT-350 carb from last year, haven,t done my new to me TW-200, hopefully tomorrow, but should be in basically the same position..
    tn_Air screw position.jpgtn_Brass plug air screw - Copy.jpg
    Fred and jtomelliott49 like this.

  11. #10
    Senior Member oilhed's Avatar
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    Thanks Fred. Found these on the inter-web. Maybe they will help others, too






    Mark F.
    Fred and jtomelliott49 like this.
    Mark Flanagan
    aka OILHED
    2014 Yamaha TW200 &
    2001 BMW R1150GS

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