Question about Briggs & Stratton Briggs Stratton Lawnmower Lawn Mower Short Block

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My 5.5hp OHV Briggs engine is leaking gas right out of the carbuerator when it is running and the engine is flooding out with no power. What's wrong?

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The needle and seat need to be replaced. The part number for most single cylinder carburetors is 398188 (briggs and stratton part number). Something has gotten stuck between the needle and the seat or the seat has either swelled or gotten so hard that it will not seat correctly. When you get the carburetor off you will need to take off the carburetor bowl. A 1/2 in socket or wrench will work ok. Then the float needs to come off. There is a pin that should slide out (may have to use some needle nose pliers to do so). Then the needle is attached to the float. The seat (rubber on most applications), is in a recess where the fuel comes out. You can remove this with an air hose.
CAUTION: When you use the air hose to remove the seat, unless you have covered it with a finger, the seat will shoot out and be lost. My suggestion is to cover the seat with a rag or something so that it does not become a projectile.
Then once it is removed you can install the new seat with a small blunt punch. (No hammering is needed.) Then you can install the new needle (included in the kit) and assemble the carburetor and re install it. That should fix that problem.

Posted on Apr 05, 2011

Testimonial: "Good advice! I have a different part number for my Briggs carb. than what you had. It works great , thanks!"

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