Lagging throttle response
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Thread: Lagging throttle response

  1. #1
    Junior Member Ndica's Avatar
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    Lagging throttle response

    Hi fellas-

    Im helping my GF with the tw200 she bought used from a previous owner. It's a 2011 with about 3500 miles.

    For an initial look over, she brought it to a shop and had them inspect the bike and clean the carb. I dont remember this problem occurring before the bike was left with them, although the bike had been sputtering anyway an needed a tune-up.

    So the bike comes back and the sputtering is all gone, it rides smooth, and power is delivered to the wheels as it should once it arrives. The only problem is a lag in the time from when i twist the throttle to when i feel power being delivered to the wheels.

    I had previously thought it was a slipping clutch issue, but everything checks out with the clutch and the gears arent slipping. I notice it in neutral or with the clutch in when the bike isnt moving. Flick the throttle, slight delay, then comes the power. Odd.

    I figure Ill be tearing down the carb to clean it, but any ideas on where to focus my attention?

    Thank you everyone!

  2. #2
    Senior Member phelonius's Avatar
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    Your girlfriend, that way she will not notice the throttle lag time.
    cowboyjeff and LuvNot like this.
    Phelonius

  3. #3
    Senior Member Fred's Avatar
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    Phelonius has a good point, you can’t go wrong focusing attention on your girlfriend.
    cowboyjeff likes this.
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  5. #4
    Senior Member SportsterDoc's Avatar
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    It is probably lean:
    1. Idle mixture screw too lean, rather than about 2 1/2 turns out from gentle seat. I'd check this first.
    2. Vacuum leak, which can be from carb not seated into intake. An unlit propane torch can be applied to area, while running...listen for a change in idle.
    3. Pilot jet partially clogged...check if you have to actually get into the carb.

    Just my 2 cents.
    Ndica and jtstdub like this.
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  6. #5
    Junior Member Ndica's Avatar
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    Thanks, Doc- Ill check that out!

    And as far as attention to the GF.... It might be a Colorado thing, but there is a phrase that goes, "no friends on a powder day," meaning that deep powder takes priority over all. I feel the same way about bikes, and shes already hard pressed to even somewhat keep up.....so.....I should fix this problem because Id really hate to have to ditch her when riding the high Rockies.

  7. #6
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by Ndica View Post
    Thanks, Doc- Ill check that out!
    Welcome, but that was just my first thoughts.
    Post what you find, but I may not see for a couple weeks.
    Leaving tomorrow for Charlottesville, VA and probably won't log-on for the duration.
    Ndica likes this.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  8. #7
    Senior Member Leisure Time Larry's Avatar
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    How much lag are we talking here? The 2011 (2001+) has the "new style" CV carb, so there will be a slight delay as the vacuum builds to lift the needle. If we are for sure talking a longer lag, then I would open the carb up and check for any holes or tears in the diaphragm, I'd make sure all of the parts and springs are there and where they are supposed to be, and that the needle and everything moves freely. Reference here: https://tw200forum.com/forum/technica...ification.html Make sure the throttle cable free play is set correctly too. Good luck!

    Our carbs are very similar to this animation:

    Ndica, jtstdub and UncleRandy like this.
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  9. #8
    Junior Member Ndica's Avatar
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    Thanks WA Larry

    That visual can help me conceptually narrow down the possibilities. You asked how much lag- having owned a few carby bikes, this is definitely off. Im not used to riding tiny engine bikes like the TW, so i was wondering if the small motor just doesnt respond immediatley to fast throttle turns. If i twist the throttle slow, it goes steady on, but the lag from a hard throttle flick without question seems abnormally long (to the point where it feels just like a slipping clutch). No other carb bike ive owned has felt like this. I appreciate everyones help. You guys are great.

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