Small Engines (Lawn Mowers, etc.)/briggs engine


QUESTION: I have a Craftsman 6 1/2 briggs engine that set up for a while and now runs well once it starts but apparently has a primer bulb problem.  I have never seen one with a hole in the center of the bulb which appears to have been made that way and is apparently intact..  I imagine it would be sealed by your finger when priming, but I don't feel the normal filling suction when priming.  i'm wondering if the source of fuel is clogged or if there is a checkvalve that is sticking?  I heard Briggs took over Tecumseh and this carb has the typical Tecumseh metal bowl on the underside.

ANSWER: Most of the Briggs float bowl carbs have a hole in the primer.  Does the engine start easy and run fine?

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

QUESTION: It is hard to start but runs fine

Usually a dirty carb will be hard to start and run poor.  

In either case I would remove, dis-assemble and clean the carb with compressed air from an air compressor.  Blow air through all the carb orifices.  

I would replace the air filter to carb gasket as they almost always break when removing the air cleaner base...a bad gasket will cause the primer not to function making it hard to start.

There are lots of You Tube videos on how to clean Briggs carbs.

Can you send me the engine model, type and code number so I can verify which carb you have?


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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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