Question about John Deere 3010,3020 Tractor Basic Carburetor Repair

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What are the 2 screw adjustments on the john deere 140 carburator ,top and side screws, how many turns out from seated position?

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  • Kelly
    Kelly Nov 12, 2010

    Hi and welcome to FixYa, I am Kelly. The John Deere 140 has been around since the 1970's There are so many different engines. They started with 12 HP Briggs and Stratton then on to a 14 HP Kohler and today the LA140 has 17.5 to 23 HP Vanguard Twin Cylinder engines. What is your engine number please so I can pass you the correct information? Just as a general rul of thumb the inital setting is 1.5 turns from the just closed position. That will NOT be the final adjustment.
    Top is usually for Idle speed and the side screw is usually for the fuel air mixture. Make your adjustments on the side screw only unless your having idle problems.
    I will just say that most carb problems are caused by debris in the float bowl and throat jet in the bottom of the carb / bowl nut threaded area. This includes a dirty float bowl nut. Additionally a dirty fuel filter will cause an engine to run lean or stall under an extended load.

    Engine make and model number please.

    Kelly .

    Once you pass your engine model number by responding here I can probably locate a manual for your engine so you can do what everis nesessary on your carb.

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Start out with three turns and go from there!

Posted on Nov 13, 2010

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Hi williamsc32...
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1 Answer

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