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  1. #11

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    I've dont have a 140 but I dont think the 26 would be too big, a lot of people run them on 125's without any drama's....
    have you checked your plug after letting it idle, 45 still seems too big and you said it ran and transitioned fine with the 36 pilot.
    sounds like something is sticking/binding to me, is the needle a little bent maybe??
    does the cable have a kink in it somewhere??

  2. #12

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    It all sounds a bit fishy to me, my 160 is tuned to perfection with 36/100 jets in my Oko. I would of thought they would be too big for a 140 but I’m no master spanner spinner. But if you have a 45 on there then it definitely sounds like you have an air leak somewhere, erratic idle is a good sign of this.

    Have you checked to see if you have the correct size return spring and clip inside the carb? Also have you pulled the carb completely apart and blown out not only the jet housing but fuel inlets too?
    OKO 26 on Zonshen 140

    04 Wr450 with tuned suspension
    05 wr450 motard with shiny bits
    2012 dpro 160 only part standard is the frame
    1982 z50r with Kitaco 75 kit and cam
    1973 Dax with a 140
    2006 crf50 with bar kit and suspension done

  3. #13

    Join Date
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    Quote Originally Posted by Cordogs View Post
    It all sounds a bit fishy to me, my 160 is tuned to perfection with 36/100 jets in my Oko. I would of thought they would be too big for a 140 but I’m no master spanner spinner. But if you have a 45 on there then it definitely sounds like you have an air leak somewhere, erratic idle is a good sign of this.

    Have you checked to see if you have the correct size return spring and clip inside the carb? Also have you pulled the carb completely apart and blown out not only the jet housing but fuel inlets too?
    Yes well starting to get somewhere. Found that the throttle was intermittently binding in its handlebar mount. Pulled it apart, removed all the grime and it is now completely free. Problem one solved. Went back to a 100 main and 42 slow and it now idles well hot, transitions well and pulls hard right through the range. Postie now cruises comfortably at 100kph. Thanks for all the good advice but don't stop now if something else comes to mind.
    Last edited by Eyles; 19-12-2017 at 05:05 PM.

  4. #14

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    what does your plug look lke after idling?,I still think the 42 is too big....
    have you read the OKO thread,multiple examples in the first 10 pages of 26's running mint on 140's.

  5. #15

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    Thanks All for the advice. The problem is now solved. The throttle cable was sticking at the throttle (handlebar) end. That was fixed easily. The new air filter appeared to have been oiled but on closer inspection it was not. I oiled it and now the engine runs well and idles properly with a 36 idle jet and a 104 main. You were all right after all - it was running lean as most off you suspected!

  6. #16

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    Quote Originally Posted by Eyles View Post
    Thanks All for the advice. The problem is now solved. The throttle cable was sticking at the throttle (handlebar) end. That was fixed easily. The new air filter appeared to have been oiled but on closer inspection it was not. I oiled it and now the engine runs well and idles properly with a 36 idle jet and a 104 main. You were all right after all - it was running lean as most off you suspected!
    just so you know for future reference, it was running RICH not lean....you went down on your pilot jet but was def the throttle sticking causing the errattic high idle.. glad you got it sorted

  7. #17
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    rotn50 is offline Master Spanner Spinning Moderator
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    Quote Originally Posted by Eyles View Post
    Thanks All for the advice. The problem is now solved. The throttle cable was sticking at the throttle (handlebar) end. That was fixed easily. The new air filter appeared to have been oiled but on closer inspection it was not. I oiled it and now the engine runs well and idles properly with a 36 idle jet and a 104 main. You were all right after all - it was running lean as most off you suspected!
    The throttle assembly was too far in causing the rubber end on the grip to touch the bar end?

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    IF IT AIN'T BROKE, BREAK IT

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