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Lawn tractor mower stops running

The mower stops running after running for a while ,will run when first started
acts like an electrical shorting problem

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I have had problems with my mowing equipment. After 15 minutes the mower would die then when cool it would run again. I changed the plug, the gas, the fuel filter,cleaned the air filter, and changed out the magneto coil, none of which fixed it. I removed the fuel solenoid from under the carb and nipped the end off the plunger with snips. That fixed it. The function of the solenoid is to kill the gas when the key is shut off. Near as I can tell the solenoid was going out when hot and working while cool. You cannot just defeat the solenoid by unplugging it because that releases the spring loaded pin and the pin shoves the float up and therefore kills the gas. I had to either spend $50 on a solenoid or nip this problem in the bud. Nipped the plunger and all is well. I posted the solution with photos HERE.

Posted on Aug 07, 2010

  • Dan Webster
    Dan Webster Aug 07, 2010

  • Dan Webster
    Dan Webster Aug 07, 2010

    That solenoid kills power to the engine when the key is turned off to prevent backfires. Unplugging it won't fix it. That just kills the gas. The solenoid gets hot and fails shutting off the fuel to the motor. Very aggravating to diagnose. I removed the solenoid and nipped off the tip of the plunger. reinstalled it and have had no more problems. At the end of a mowing session I idle down the motor to a crawl for 5 minutes That prevents backfires. My fixya tip


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How old is your mower if older problem is points if newer problem is module ,most of the time you can run these until they get hot then they will act up if you let it cool you can start it up and it will run ok until it gets hot again.

Posted on May 16, 2009


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