B&S Engine Stalling

Lossen the gas cap a couple turns, and see if the problem goes away. If so, the vent on the gas cap is not working right.

Bob

Are you sure there is no crud in the tank blocking the pickup.

Have you replaced the primer bulb/fuel lines? The kit usually has both the bulb and lines. About $7 @ Lowes.

I've worked on a lot of lawn mowers, but this one has me scratching my head. Since it starts right back up, that rules out valve clearance, and bad ignition coil.

Makes me wonder about water in the gas, or bad gaskets as you say. Always a good idea to pull the motor cover off, and clean off any grease, grass, or dust from the top of the motor. Air cooled, you know.

If the primer is sucking air, makes me wonder if the vents in the gas cap are clogged? Or, if the fuel line from the tank to the carb has a problem.

Try running the mower with the gas cap loose half a turn or so. The more I'm thinking, the more it sounds like a clogged gas cap vent. Needs to draw air in, to replace the gasoline that is going out.

Some "tiny holes" need to be cleaned with a piece of wire. A wire plucked from a wire brush (stainless is best). These ports clog and you don't get the right air/fuel mixture in the carb throat.

Have you tried to run this engine without an air filter after it stalls? Pull the air filter off, run it and see if it stalls.

Before it dies out, can you spray carb fluid in to keep it running?

-- Oren

"The voices in my head may not be real, but they have some good ideas!"

Muffler may be clogged. Engine needs to breath just like a human, inhale and EXHALE! Check your muffler for free air flow.

Cheers, Joe

I've heard of this, but never had it happen too me.

Maybe an air/fuel mixture screw adjustment would help the OP.

-- Oren

"The voices in my head may not be real, but they have some good ideas!"