Small Engines (Lawn Mowers, etc.)/B&S Engine Carburetor


I have a B&S engine, 1BSXS.191VF 275228, on a DeVilbiss Ex-Cell Pressure Washer Mod. EXVRB2321, Ser.#2251017647.  I was replacing the carburetor and misplaced the three screws that hold it in place to the block.  Can you tell me the specs for these screws so that I can look into replacing them as I cannot seem to find a parts breakdown for this engine?  Tough to guess on the thread pattern, length and diameter.  Any help would be appreciated.

Most likely 1/2-20 threads.
Copy and past the URL below to find the engine model number:

The engine model/type should be something like 12h812-2324-e1.

Some of the carburetor screws are unique with a taper on the end new the hex bolt head.

Send me the model number so I can look up your engine.


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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