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I have a land master  LM 400. Starts up just fine and idles fine but as soon as I run it for a little bit it seems to start sputtering so I pulled a choke out and it runs fine for a couple seconds and then I push the choke back in and it just shuts off. Any suggestions as to why? 

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Choking an engine provides a rich fuel mixture be lessening the amount of air entering the carburetor. So somewhere you have a fuel restriction, I would start by cleaning all fuel lines making sure the are clear of debris, if it has a fuel pump, be sure it works properly, and change the fuel filter.

If none of that works there's possibly a blocked jet in the carburetor that needs cleaned.

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