Model #MV20S-57514 KOHLER Engine

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Question and Answers

Q:

Tractor wont stay running for over 3 min MV20S-57514 Kohler 20 hp kohler engine

A:

Thanks for the inquiry and for using SearsPartsDirect.com.
Sorry to hear of the engine issues you're having on the Craftsman tractor, I know how frustrating issues like this are to have occur.
I am strongly suspecting the carburetor. It could have a stuck needle and could be varnished inside. I would pull the carb from the engine. With a full can of carb cleaner, a wire brush, and a bread tie wire to poke through and clean the main jet; I would recommend a very thorough cleaning. Start by taking off the float bowl. Douse it very liberally with carb cleaner, and undo the pin for the float, and remove the needle and float. Clean them very thoroughly with the wire brush and carb cleaner. Pay close attention to the seat the needle sits in and clean it well. Once clean, start brushing the carb bowl and body and make sure you get all the varnish out. It may take three or four brushings with carb cleaner dousing in-between. From there, take the straw of the carb cleaner and shoot carb cleaner through any little hole or passageway of the carb. Shoot out the throat of the carb and poke the main jet with the bread tie wire. You have to make sure you get everything the first time, if you leave anything behind, it’s likely to reclog once you have it reassembled. 
If the internal components look worn, or the carb is excessively dirt, a rebuild or replacement may be called for. I have linked the Kohler parts list below to help you locate the correct parts if needed. 

Kohler MV20S-57514 Carburetor Parts List

Hope this helps out and thanks for using SearsPartsDirect.com. We appreciate your business. 

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Jeff Wallace Sr -
Sears Technician
August 05, 2014