If the air filter is the sponge-type, it can be washed with soap and warm water, then rinsed. Wring as much water out of it as you can and then let it dry completely. After it dries, soak a little oil on it before re-installing it. If it's a paper filter, you can tap the filter against something to shake out the loose dust/dirt. If you can't "see daylight" showing through the filter after cleaning, replace the filter.
clean the air filter air is being restricted
If you have fuel coming out of your air filter, then your carburetor bowl float is most likely gummed up an stuck. try tapping on the bowl, or you my need to take it off an clean it and the needle jet. How do you adjust air/fuel mix on a lawn mower motor?
The air filter assembly is usually attached to it.
The air filter is usually located inside the canister that is bolted to the carburetor.
Change the oil of the lawnmower and clean the air filter. Your spark plug might need to be cleaned.
Most likely revving due to a dirty/clogged air filter.
under a plastic cover, next to the carb,
if its dieing under heavy load clean the plug and the air filter and sharpen the blades, make sure your using fresh fuel and mow slower.
make sure the gas valve is turned on and you put the air filter in right
Most use the B&S# 491588
Front of the engine screwed to the carburetor
Remove the air filter caseing disconenct the fuel pipe remove the bolts which hold the carb in place. L Davidson lawn mower tech