You are here:

Small Engines (Lawn Mowers, etc.)/B&S model 98902 will not idle


I have a power lawn trimmer with a B&S 98902 - 1110B1 engine.  The engine starts and runs but will not idle, instead it revs up and down.  I'm not sure where to start looking for a solution.


Almost all surging problems are caused by a dirty carburetor.

Have you removed, disassembled and cleaned the carburetor with compressed air from an air compressor?  I would use spray can carburetor cleaner as well and spray carburetor cleaner through all the carburetor orifices to make sure they are clean.

If you have never cleaned a small engine carburetor you can view lots of videos on You Tube on how to clean and overhaul small engine carburetors.


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.

[an error occurred while processing this directive]