Carb Screw identification help
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Thread: Carb Screw identification help

  1. #1
    Senior Member Snake2715's Avatar
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    I have been reading for the last couple of hours, I did use google to search the older forums.



    I have a question as quite honestly I am new to carborated motors. I have worked on cars and my last bike I owned that I messed with was before I cared or even knew to be concerned with these things. Previous to this new TW I had a few quads, they were so new it was a non issue.



    I have the first TW which is a 2006. I have read time and time again that they are most likely too lean from the factory.



    I see a lot of info on the older carbs and am so new at this I don't completely understand the difference. Also a lot of posts are not for newbies like me and don't have pictures!









    MY QUESTION:



    At Bikebandint they have the exploded view of my 2006 Tw200 carb:



    http://www.bikebandit.com/houseofmot...-tw200/o/m7782







    What screw am I turning the suggested 2.5 - 2.75 turns out as a starting point?



    Is it screw # 27 "Air Screw Set"





    Or is it screw #16 "pilot Screw set"





    The reason I am confused is that I have been reading it that the idle or air set screw is under the plug on the bottom of the carb... but according to this parts breakdown the pilot screw is under the plug and on the bottom.



    I am not sure if the newer carbs changed the location or if I am just incorrect in my understanding.









    I realize I will gently screw it in till it bottoms and count where I began, in case I have to go back, and then turn it 2.5 to 2.75 turns out and see how she runs.



    There is no big issue right now, it even starts without the choke on for the most part. However I am afraid that under a load or when me and the wife are both on the bike (<320 lbs) that we may put more stress on the motor if its lean. I would rather lose a bit of mileage and keep the engine colder.





    Its greatly appreciated.



    Thanks

  2. #2
    Senior Member uktw125's Avatar
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    It's #16 in that diagram.

  3. #3
    Senior Member jbfla's Avatar
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    Quote Originally Posted by Snake2715 View Post
    What screw am I turning the suggested 2.5 - 2.75 turns out as a starting point?


    Bottom view of the TK carb, 2001 and newer TW's:







    Different names for the same thing. I usually call it the idle mixture screw. It regulates the flow of fuel through the pilot jet (which is inside the carb).



    My stock idle screw setting was 1 3/4 turns. Everyone's setting may be slightly different. I believe Qwerty has posted instructions on how to set the idle screw.



    jb
    Fred likes this.
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

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  5. #4
    Senior Member Snake2715's Avatar
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    Thanks for the prompt answers. Its greatly appreciated.



    I will search for qwerty's info. i see his pinned jetting thread, but I will see what else i can find that addresses just this.

  6. #5
    Member migopod's Avatar
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    Did the plug just pull out with the screw or does one have to drill it at all?
    1976 cb550f SuperSport, 2010 tw200



    Entia non sunt multiplicanda praeter necessitatem

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  7. #6
    Moderator vuldub's Avatar
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    Most of the time the plug, #32 in the referenced diagram, needs to be drilled then pryed out.
    Regards...Wes
    In the Stable: 73 Honda CT90,81 Honda CT110,81 Honda CT70,04 Yamaha TW200,07 Kawasaki Vulcan 1500

  8. #7
    Moderator vuldub's Avatar
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    Since we are on ID the carb screws, which one is the float chamber drain screw? I thought it should be #27, but it is labeled as air screw set - that doesn't seem correct. In the TW200 service manual it says "drain the carb with the drain screw" but there's no reference in any diagram....
    Regards...Wes
    In the Stable: 73 Honda CT90,81 Honda CT110,81 Honda CT70,04 Yamaha TW200,07 Kawasaki Vulcan 1500

  9. #8
    Senior Member jbfla's Avatar
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    Quote Originally Posted by migopod View Post
    Did the plug just pull out with the screw or do have to drill it at all?
    The plug has a tiny hole in it. I used a thin self tapping screw to screw into that hole, then gently rocked the screw side to side and pulled with the pliers. It came right out.



    You can enlarge the small hole with a drill bit if you like. Just don't drill too deep. The plug is ~2mm thick.



    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  10. #9
    Senior Member jbfla's Avatar
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    Quote Originally Posted by vuldub View Post
    Since we are on ID the carb screws, which one is the float chamber drain screw? 0 service manual it says "drain the carb with the drain screw" but there's no reference in any dia I thought it should be #27, but it is labeled as air screw set - that doesn't seem correct...
    Hi Wes, the label on the parts diagram is wrong. The one labeled "air screw" is really the float bowl drain screw.







    On the TK carb there is no air screw, only a fuel mixture screw.



    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  11. #10
    Senior Member Snake2715's Avatar
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    So is the adjustment method for the newer carb with no air screw then different for adjustments, or a rejet?

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