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Hello. My John Deere mower has started surging at an idle. I cleaned the gas tank and replaced the fuel filter but it still surges at an idle.

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  • sandmancoop May 19, 2009

    My mower surges at low idle. It sometimes skips at high idle. I replaced the fuel and air filters. replaced the fuel pump and sparkplug. Dropped the carburator bowl and cleaned it. Nothing helps.

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I have a john deere 420 rider. It would surge at a higher speed. It is a hydrostatic and there were 2 bolts on the transmission that were loose. now it runs beautifully smooth,

Posted on May 04, 2009

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No answer... but I have the same problem I have a x320 with 15 hours on it. just took it in sat. They will look at it Monday but told me it probably won't be covered under warranty because they can't control what gas I used. and that's B. S. THEY TOLD ME I SHOULD OF BEEN USING NON Ethanol gas......

Posted on Apr 25, 2016

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THE BABY BOY

Posted on Sep 25, 2011

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JD lawn tractor starts hard, can only idle and gas drips out of tube on carb until warm,it runs for 20 mins. then starts surging and dies,wait awhile, then starts.


try removing the carby and cleaning out the needle and seat area
the float pushed the needle up into a seat that can get hair , grass bits , dirt between the needle and the seat and then the fuel becomes uncontrolled and flows out the carby
I suggest a clean , blow out oul of the jets and work from there

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Cleaning the carburetor is a good starting point. There is two versions the Briggs that were used on this mower. One had a single barrel and the other had a two barrel version. Both were Nikki carburetor that main jets that are held in place by tiny o-ring that shrink causing the jets to leak extra fuel causing surging.

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If fuel is getting into the oil, I would say the needle and seat or float in carb is not stopping fuel flow. I would check carb again and adjust float level. Change or install an inline fuel filter too. Surging is almost always carb related. If problem persists after checking carb again, check governor springs. If they have been bent at all after removing carb, they can be bad. If you replace new governor springs and surging still exists, try doing a static setting on carb/governor. If your unit has an oil/centrifugal governor, move governor arm in the direction that opens throttle valve in carb all the way, hold in place, loosen nut on governor arm and grab small tang that goes inside engine and turn in the same direction you moved governor arm, rotate this until it stops, hold in place and tighten nut on bottom of governor arm. This is called a static/factory setting. Make sure throttle cable is in high position when doing this. Let me know if you have any questions. Good luck!

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