Small Engines (Lawn Mowers, etc.)/Craftsman running rough


QUESTION: Hello, My tractor is running very rough. Had to add some seafoam to get it started now it runs rough. Craftsman from sears, briggs and Stratton I have a video but I cannot attach it.

ANSWER: Since you had to add Seafoam to get is started either the fuel(gasoline) is old and stale and/or the carb needs to be cleaned due to old fuel in the fuel system.

Can you send me the model number, located on a sticker about the size of a business card usually found under the seat or rear fenders, so I can look up your mower?


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Thank you for your reply. The model is 917 273 820, What is the easiest way to drain the old gas? I think you nailed it!

According the parts diagram you have a Briggs and Stratton model 31P777-0296-E1 engine.

I did not see a fuel pump on your engine so there are a couple of ways to drain the fuel tank.

You can use a siphon pump and siphon most of the fuel out of the tank.  Or you could dis-connect the fuel line from the carburetor and drain the fuel from the fuel hose into an approved gas can.

Does your carburetor have any wires connecting to the bottom of it?


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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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