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Small Engines (Lawn Mowers, etc.)/Mower idling very high then shutting off.


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A neighbor who was moving in gave me a mower they found in their garage. It started right up, but it idled extremely fast/high and actually worried me a little. Then it died. It will start right up again, run for about 15 seconds at a really high rate, then die. I don't know much about engines, but I imagine it's maybe a governor?
It's a Briggs and Stratton engine 5BSXS.1581VG

Thanks for the help!

The engine should have an air vane governor.  Most likely something is binding or sticking causing the engine to run too fast.  Remove the air cleaning and see if you can move the carubretor throttle shaft by hand.  It should move back and fourth very easy.

Watch this video and see if this is the carb you have.


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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