What product should I use to clean the carb on a surging Briggs and Stratton lawn mower? [SOLVED]

Thanks for the question, Kenny! Use Sea Foam Motor Treatment in the fuel. Here’s what I’d do:

First, if the fuel is old, go ahead and drain it. Then, add 8 oz of fresh fuel and 4 oz of Sea Foam to the tank. Crank/rope pull/prime the engine to draw the mixture into the tank, and let it sit overnight before starting. Run it until empty before filling up with fresh fuel. That will do a great job cleaning up the carb.

Here’s a great page on our site with more details.

https://seafoamworks.com/fixing-common-carburetor-problems/

Additionally, here is a video with step by step instructions.

https://www.youtube.com/watch?v=ZreiTnd6TI4