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Lawnmower starts and dies... where is the main jet for the carb?

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Try cleaning the air filter, then a touch of starting fluid right into the carburator by taking the air filter off. If it then starts but wont run or stay running, the reservoir below the carb should be removed to clean at and the pinhole in the intake tube above the bowl nut. This is the most common problem with lawnmower start problems, the pinhole can be unplugged with one wire from a wire brush. Be careful with the gas, at least pinch off the gas hose with a vise grips while removing the carb bowl.. Never use a droplight around gasoline. most lawnmowers have no mixture adjustments, so it is a matter of cleaning the carb, tank, gas lines. Some oils in gas mix systems settle and clog after less than one season.

Posted on Oct 08, 2010


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you may just need to remove the nut that holds the float bowl, and inspect the nut itself, half way up the nut should be a little tiny hole in the side.
use a bread tie stripped of the plastic covering and unclog this little hole, then replace the nut , when that hole becomes plugged the main jet cannot get fuel for the venturi pipe, thus the mower will start and hit a couple times then die immediately, that may fix the problem

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