Question about Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series - Sens - A - Speed Walk Behind Mower - 10685

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3.5 HP Lawnmower engine and it rus for only 30 seconds

It is a 3.5 HP Lawnmower engine and it rus for 30 seconds and then slows and stalls. Cannot restart without priming it. Took carb apart and checked and cleaned everything!!!

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  • Tecumseh Master
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Sounds like you will need to clean your carburetor even tho you said you alread did.
Make sure to blow out all the jets with compressed air, beware of small parts sometimes in the jets such as seats for the fuel float jet seat.
Sometimes you can get by with priming the carburetor a few times, and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
If the mower/weedeater is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, You will first seat the jet screws and count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
Please rate me,
Thanks
Good Luck,
I hope this helped

Posted on Aug 15, 2010

  • GreenBalls Apr 15, 2011

    Definitely not the answer. Cleaning the carb is great for the carb, but these mowers are just not made like they used to be. Put in fresh gas, changed oil, cleaned carb 2x and cleaned mower. Starts up, runs for 10-30seconds and dies. Can start again without priming, but does the same thing. New air filter and spark plug as well, but same results.

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Posted on Jan 02, 2017

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