Small Engines (Lawn Mowers, etc.)/B&S engine stalling


QUESTION: B&S engine # 92502 318601 90022251 on a push mower.

The mower usually starts ok, as it did this afternoon, but after running about 10 minutes, the engine suddenly slows down. Sometimes if I rise the front of the mower, it will speed up, but that doesn't always work and didn't work at all this afternoon.

When it shuts off, if I let it sit for 15-20 minutes, it will start up again and run for another 10 minutes or so, then it slows down and then shuts off again.

Could this be a problem with the governor?

ANSWER: Is the carb on your mower a pulsa jet or pulsa prime?  

If you have a primer then you have the pulsa prime carburetor.

If you have the old pulsa jet carb with the aluminum carburetor then you may have a common issue of the carburetor or tank warping, just a little, when they warm up.  This warping causes the carbs not to function properly.

Let me know which carb you have.


---------- FOLLOW-UP ----------

QUESTION: Pulsa Jet.

If you like the mower and the engine runs good, aka does not burn oil or smoke, I would consider replacing the pulsa jet with a pulsa prime carb and tank assembly.

The pulsa has several advantages over the pulsa prime including a low price for the upgrade and you will get easier starting with the pulsa prime assembly.


Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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