Small Engines (Lawn Mowers, etc.)/Gas leaking


I have an Ariens 20hp riding mower...(motor model 331777--2372G5 briggs.  Yesterday, the motor would not idle and would only run on high rpm.  This morning when I went to check the mower, gas was dripping out between where the head attaches to block (underneath the bottom---there was no gas leaking from valve cover).  I took the valve cover off and there was aprox 4-5 oz of gas that poured out.  The valves seem to all be in adjustment as I rotated motor by hand and valves open and close properly.  Help?

Leaking inlet needle seat.  Has the carburetor ever been rebuilt?
Do you have an air compressor?  Have you ever rebuilt a carburetor?

Check You Tube for mower carburetor cleaning or rebuilding...there are lots of videos.

Let me know if you have an air compressor and any experience rebuilding carbs.

Small Engines (Lawn Mowers, etc.)

All Answers

Answers by Expert:

Ask Experts


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

©2017 All rights reserved.