Question about Mtd 22" Yard Machine Push Mower

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I have a yard machine 400 series front engine lawn tractor.

I had a problem with it starting, It would run for a few minutes then stall out. I took the carburetor off and cleaned it my problem is that I need to put the carburetor back on and I forgot how the throttle lever goes back on and also how the governor lever goes back on. I should have taken pictures. I have the repair manual but it does not show a picture of the engine or any of the levers.

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Posted on Jan 02, 2017

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SOURCE: I HAVE A MTD YARD MACHINE 12A446B729. RUNS FIVE

was having the exact same problem with my 6.5 hp Toro lawnmower with a Tecumseh engine. The engine would start up okay but after a few minutes of mowing, the mower would start missing and eventually shut down. I would pull and pull and pull on the starter rope, getting angry and frustrated and eventually going back in the house to let it cool down.

I looked up all kinds of information and I finally decided it was a bad coil (something about the resistance being low when the mower wasn't hot and then when it heated up the coil would conduct enough electricity to somehow make the engine shut down.)

I called a local shop and wanted to get an estimate on replacing the coil. I have no clue about engines so I dared not get into the guts of the mower myself. He told me to check the gas cap. HUH??????

He told me to make sure there wasn't a part missing out of it. I thought, what the heck would a gas cap have to do with the engine shutting down. Well, apparently there is a mechanism on these caps that prevents a vacuum from pulling on the fuel system and my gas cap indeed had a part missing. To verify this, I cut the grass for about 5 minutes. When it started to run rough, I took the gas cap off to allow pressure to escape from the gas tank and voila! it started to purr like a kitten.

So, I'm only out $4 for a new gas cap and I'm as good as new. Man I wish I was more mechanically inclined so I hope your problem is as easy to solve as this one.

Hope this helps!

Posted on Apr 14, 2009

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SOURCE: Lawn tractor jerks when driving across lawn

Can you adjust tensioner

Posted on Jul 20, 2009

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SOURCE: yard machine mtd 123cc mower stalls after starting

dirty gas. the fuel bowl likely has junk in it which plugs the jets as soon as it starts. you may get luck just emptying the carb bowl but a good carb clean and new gas will do the trick. (dump out the old gas

Posted on Aug 16, 2009

  • 138 Answers

SOURCE: Mower starts, but dies immediately

that's not a choke lever, it's used as a speed control on some models. the two springs are attached to the governor rod, which is attached to an "air vane" governor - on these engines, you need to keep the gas tank fairly full at all times, the dip tube on the carburetor rides up off the bottom of the gas tank, if fuel level goes lower than this tube, it won't pull any gas to the intake - from your descriptions, though, it sounds like the diapragm between the carb and gas tank has "curled". briggs had a service flash on the problem and since it's new, you should take it to a shop that does briggs warranty work - it should be covered under warranty

Posted on Aug 28, 2009

MNfisherman
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SOURCE: I have a Yard Machine Lawn Motor with a 4.5hp

Pull apart and clean the carb. You can dismantle and soak the carb in solvent or equivelant for a couple hours. A dirty carb and poor spark are the major reasons that the motor won't run well.

Posted on Sep 21, 2009

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It stalls after running fine for 30-45 minutes


Hi James:
Thanks for providing an extremely detailed history.
My first reaction was similar to yours............ sounds like a fuel supply obstruction, but you seem to have covered it extremely well.
There are two other things you may consider checking.
1) When the stalling occurs, shut off the engine and pull the spark plug(s). Check the appearance of the electrode, wet indicates firing (spark) problem, dry indicates fuel delivery problem. While the engine is still hot, reconnect the plug lead, hold the plug against the head, then spin it over and check the spark. You're looking for hot and blue.
2) Exhaust obstruction. Remove the muffler and make sure that there is no carbon buildup or defective baffle that could be causing excessive back pressure.
If you reply as a comment to this post I'll get your feedback.
Cheerfuls
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Yard machine mtd 123cc mower stalls after starting it runs for a few seconds and then stalls. Previous to this it only ran on choke but when you took the chock off it stalled also. Now it stalls even when...


dirty gas. the fuel bowl likely has junk in it which plugs the jets as soon as it starts. you may get luck just emptying the carb bowl but a good carb clean and new gas will do the trick. (dump out the old gas

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