Question about Mtd 22" Yard Machine Push Mower

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Hi/low idle I have a MTD 21" 4 hp push mower which is running a little funny now with a hi/low idling. It never stalls just a rhythmatic hi/low idle. I have changed the spark plug, air filter and oil. I did notice that just before the fuel tank runs empty,(about 30 seconds) the idle smooths out. Any suggestion?

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  • ctafisher Jun 27, 2009

    yes. A briggs and Stratton engine with rectangular fuel tank with varb/air filter on top.

  • ctafisher Jun 27, 2009

    tj_gunter - yes, the spring is in place. 7 yrs old. Should i replace?

  • ctafisher Jun 28, 2009

    Hi Dwain. Yes i do plan to fix this myself. What do you suggest?

  • ctafisher Jun 29, 2009

    Hi Dwain. The governor spring and tab looked fine. The tab is fixed so no problem there. I picked up the diaphragm kit you mentioned and installed kit, cleaned screen on the pick up. Now she's purring like a kitten. Thanks for your help. I greatly apprieciate it.


  • Dwain Pippen May 11, 2010

    It's not the governor spring, rather a fuel delivery problem. Do you plan on trying to fix this yourself. If so, I can tell you what to do. Let me know. Dwain

  • Dwain Pippen May 11, 2010

    Is you engine a Briggs and Stratton and have a rectangular fuel tank on the side with the carb and air filter sitting on top of it?

  • Tommy Wright
    Tommy Wright Mar 18, 2014

    I am having the same problem, same setup, id like to know the problem

  • Anonymous Mar 29, 2014

    Replaced oil filter, fuel filter, air filter, and spark plug. It wouldn't run smoothly, so I put the old spark plug back in, same problem. Thoughts?



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Ok. First do one thing. Remove the air cleaner and start the engine. With your finger, push against the side of the governor spring to raise the rpm's some and hold it there. Is the 'hunting' still there? The tab the spring is attached to adjusts the governor speed and being located where it is, is prone to being bumped while mowing, pushed in and lowering the engine speed. If it still surges, this is what I would do... Remove the fuel tank and carb assy.. Two bolts, one behind the gas cap and one on the end of the tank. Pull it straight off the intake pipe then unhook it from the throttle link. Now, empty the tank and unscrew the carb from the tank. Clean the carb with a can of carb cleaner. Slip the screen off the pickup and make sure it's clean. Discard the pump diaphragm and gasket. Buy a new pump diaphragm kit, part #795083. Clean the top of the tank where the pickup with the screen fits into. Put it back together. Remember to put the rubber diaphragm against the tank and the gasket on top of it then the carb. Don't forget to attach the breather tube when you're putting it back on the engine. That should fix 'er up. Also, if the rubber ring and plastic retainer ring came off on the intake pipe when you pulled the carb and tank off, snap them back in the end of the carb before sliding it back on the intake. Hope you can make sense of all this. Let me know how it goes. Dwain

Posted on Jun 29, 2009

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  • 59 Answers

Check the govern spring to see if it is in place

Posted on Jun 27, 2009


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