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Sears Craftsman mower-Tecumseh engine 3.75 HP- wouldn't start-replaced air filter & spark plug; dismantled carburetor and cleaned it; now it will start but only runs for a couple of seconds and dies. Suggestions?

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Check the linkage for the governor, maybe on the wrong side,when off it should be pushing the throttle wide open, the governor brings it down after start up!

Posted on Jul 24, 2011

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I have a 4 hp tecumseh that runs good when it is first running.After a little while it seems to loose power,runs slower and slower.Ive cleaned and set float in carb,put a new carb kit in also.plug and wire...

This could be 3 of possible solutions to this problem..
From a Sears Tech of 22 years,,,,,,,,,,,,,,

1) Replace the Fuel Cap! Remember that air must fill the void of the fuel going out to the carburetor, If the fuel cap is clogged It will cause poor performance.

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If the body or bowl of the carburetor is plastic, then the best solution is to replace the bowl with a kit that is offered by the manufacture.
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