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One of the causes is reduced airflow to the carburetter, so cleaning or replacing the air filter may help.
That may help but that will not cure the problem. If the lawn mower is surging then it is getting enough gas then it is being shorted. If the airfilter was the issue, the engine would more likely just run at a slower speed(2500-2800rpm's). Since the engine is surging, the carb must be cleaned and the gasket between the carb and gas tank has to be replaced. This is a very common issue for the Briggs 3.5 to 4.75 vertical shaft engines. It is very simple to clean the carb that is on that engine. Simply remove the airfilter and the two bolts holding the carb/gas tank onto the engine. After it you have the carb/gas tank in your hands, take the 6 bolts out that connect the carb to the gas tank. Clean everything out and replace the gasket and you are good to go.
The most important thing to remember when you are removing the carb from the gastank is to take note of what goes first onto the gas tank(the gasket or the diaphragm, some come with the gasket first and some are the diaphragm first...luck of the draw.
Hope that helps!
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Why doas your 23 hp Briggs and stratton 2 cylander vanguard motor surge and sputter at high rpm?
You need to either adjust your carburetor richer or leaner while at full throttle.
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it could be caused by a few different things. the pneumatic governor or a fuel issue. an easy test is to hold the throttle on the carb closed to an idle. if it continues to surge then it is a carb issue, if it stops it is a governor issue
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The most common cause of surging is a dirty air filter. EPA approved carbs tend to run lean causing the surge condition described. Main jet needs to be replaced with next size larger.
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