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The film shows how to clean a Briggs and Stratton (plastic) carburetor to eliminate speed fluctuations in the petrol lawn mower (also called sawing or surging). If you are in a hurry, you can skip straight to minute 11. If the carburetor still doesn't work, please watch the video • How Does a Carburetor Work? Theory ... The important thing is the path with the three small holes near the closed throttle valve. Unfortunately, this area is difficult to clean, so just try blowing through from the holes (i.e. against the normal working direction).