engine hesitating with throttle slightly open?
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Thread: engine hesitating with throttle slightly open?

  1. #1
    Senior Member jckosnow's Avatar
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    2012 tw 1700 miles. it's always been the case that if I open the throttle just a teeny tiny little bit when I'm cruising in 5th gear then I can feel the engine kind of sputter and slightly hesitate----say 1/20th open throttle (my hunch, not measured). now, that hesitation zone seems to be getting bigger---say 1/8th open. I hope that description makes sense to someone. can I adjust the throttle somehow to fix this? is it something other than the throttle? Am I crazy & nothing's wrong? haven't touched the carb at all, everything stock. thanks for your time & expertise!!!
    2012 TW200, 1993 KLR650, 1992 GSX750F

  2. #2
    Senior Member jbfla's Avatar
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    If your carb is completely stock, what you are experiencing is a "lean surge".



    It can be corrected by adjusting the low speed fuel/air screw located under a plug on the bottom of the carb.







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

  3. #3
    Senior Member jckosnow's Avatar
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    thanks!
    2012 TW200, 1993 KLR650, 1992 GSX750F

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  5. #4
    Senior Member jbfla's Avatar
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    There's a bit more to optimizing your carb for your location, but the fuel screw is a good starting place.



    Lzrdbrth gives a good expiation of how to adjust the idle mixture screw (fuel screw).

    He has a different carb than you, but the procedure is the same.



    https://tw200forum.com/index.php?/top...post__p__59032



    You might like to read the sticky in the Tech section on tuning.



    You said the problem seems to be getting worse. This may be an indication that the internals of the carb are getting dirty. Adding a couple of ounces of Seafoam, or other fuel system cleaner, to the gas tank would be helpful.



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

  6. #5
    Senior Member Omega Man's Avatar
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    Quote Originally Posted by jbfla View Post
    If your carb is completely stock, what you are experiencing is a "lean surge".



    It can be corrected by adjusting the low speed fuel/air screw located under a plug on the bottom of the carb.







    Jb


    I drilled the plug out on the bike using the Milwaukee right angle drill adapter with a tec-screw for the drill bit. Worked great. OM
    "It's more fun going fast on a slow bike than going slow on a fast bike" UK

    1994 TW200, 2009 F800GS loaded,

  7. #6
    Senior Member Gerry's Avatar
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    Boy JBFLA, everytime I see your carb pictures I am sooo impressed. Clear, clean and so well presented. TW folks that happen upon your pictorials are so lucky as resolution is now within reach. Gerry
    kemp.darryl likes this.
    Take care my Friend.........

  8. #7
    Senior Member jbfla's Avatar
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    Quote Originally Posted by mrgizmow View Post
    Boy JBFLA, everytime I see your carb pictures I am sooo impressed. Clear, clean and so well presented. TW folks that happen upon your pictorials are so lucky as resolution is now within reach. Gerry
    Thanks, Gerry.



    What you are seeing is the end result of many not-so-good photos.



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

  9. #8
    Senior Member jckosnow's Avatar
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    ran through a whole tank with the appropriate amount of sea foam in there, seems to have solved 75% of the problem. the rest I'll just chalk up to colder weather. will experiment with tuning the carb in the summer if I get up enough nerve. thanks again for your time.
    2012 TW200, 1993 KLR650, 1992 GSX750F

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