honda idling funny?

Discussion in 'Mechanic and Repair' started by cariboulou, Jun 8, 2006.

  1. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    Got a 5 hp gx140 (I think) horizontal shaft engine on a go cart my boys use, but lately the idle goes up and down, until it finally quits. We restart it and at rest the idle still goes up and down. I took apart carb and cleaned it out including the seat all with carb cleaner , and cleaned out spark plug and it still idles wierd? any suggestions?
  2. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Messages: 2,613

    Does it run smoothly at full throttle?
  3. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    yes, it seems to run normal at WOT
  4. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    There is supposed to be a spring over the throttle link rod, Make sure it is connected to the governor arm and the small hole on the throttle shaft on the carb., Without this spring hooked up it will cause a hunt.
  5. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    it is hooked. It was working fine a couple of weeks ago, and then it started idleing funny.
  6. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Look on the front of the engine block, In the center will be a smooth area with the model and spec. numbers and or letters. Post these so I can see exactly what engine you have.
  7. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Messages: 1,164

    Do you mean it is surging at idle? There is what will look like a black rectangle under the idle adjustment screw on the carb remove the idle adjustment screw (Phillips head) and pull that black plug out of the carb take carb spray w/straw and spray out that passage then reinstall the plug and screw and retest sometimes this will stop the surging.
  8. Jim@MilkyWay

    Jim@MilkyWay LawnSite Senior Member
    Messages: 472

    cariboulou, how many hours would you estimate on engine? Your symptoms sound distressingly familiar. Do a little inspection for me. Take off air filter or what ever is necessary to expose the "throttle shaft" where your butterfly is. Grip it on the outside of carb, where your linkage connects, and check carefully to see if it will wriggle; up, down, or back 'n forth. Check on both sides of carb body. If it wriggles, you will need a new carb as there is probably no fix for this. If I am wrong, (RetroRob) about a possible repair, please let me know and I will repair that carb to which I referred in my own carbNmanual post.
  9. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    took out the rectangular black plastic thing, sprayed with carb cleaner, and reinstalled and still not a normal idle. played with the black phillips idel screw and runs high at idle and then after driving a little shuts off when letting off throttle?

    FIXDISS LawnSite Senior Member
    Messages: 445

    Try putting the tube on a can of carb cleaner or penetrating oil and spray a burst around gasket area of carb base and intake. If engine speed changes you have a leak and won't ever get it to idle . These karts take a lot of abuse and those bolts could have worked loose.

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