Question about Briggs & Stratton 190cc 875 Series OHV Walk Behind Lawn Mower Engine 25mm x 3532Inch Length Crankshaft 12S5020025B1

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Brand new B&S series 550. 2nd time trying to start, runs for 5 seconds and stops. Pumping the primer will keep it running for 5 seconds at a time. First use, 4 weeks earlier, ran like a dream! What is the problem?

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Water will cause problems like this. Ethanol in the fuel causes the water in the air to pool in the tank. 2011 engines will be equipped with a better orfice that will not corrode from the water. You might contact a local dealer like and get the updated tube.
good luck

Brand new B&S series 550. 2nd time trying to - barterjoe_50.png

Posted on Mar 01, 2011


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Craftsman gas pressure model#580-752220 willnot stay running. Only after you push the primer 10-20 times it will start &run for 5-10sec..It will run if you pour gas in carburetor.If you quit with the...

Sounds like the idle jet in the carb is plugged up.

It only stays running from the primer load, then dies when that is used up, as the gas can not get from the float bowl through the idle jet.

Did you store it for a while with the gas still in it?

If so, what happens is the gas starts to go bad, and over time it can get almost like a varnish.

When this happens, it starts plugging up the small ports in the carb, starting with the smallest, which is the idle jet.

Before storing for any length of time, your best bet is to drain the gas and run the float bowl dry.
If not that, at least add some fuel stabilizer to the gas left in it, and run it for about 5 minutes with the stabilizer in the fuel.

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