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My tecumseh push mower will start good but wont stay running..could it be old or bad gas

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It can be a couple of things. Definitely it could be bad gas. It also could be a defective spark-plug, debris inside the carb., clogged air-filter, a nest underneath the cover that covers the fly-wheel, rust on the magnet ( that needs to be lightly sanded off) reducing the created pulse to the coil, If you have done the following inspections and the symptoms stay the same then you may need to replace the carb, over time they get old and wear out. Let me know how it went, good-luck.

Posted on May 15, 2010

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I have an mtd yard man mower that wont stay running, Any suggestions why?


I 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!

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