Craftsman is the brand name used by Sears stores on its lawn and garden equipment. Craftsman mowers are powered by a gasoline engine that contains a choke in the carburetor. A choke controls the fuel-to-air ratio by closing or opening a flap in the carburetor. A cold engine requires a richer mixture to stay running. A choke accomplishes this by closing off the flap to reduce the amount of air entering the carburetor. Some models have a manually adjustable choke that requires operator-input to keep the engine running smoothly until it is warmed up.
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Pull the choke adjustment knob on the dashboard out completely if the engine is cold.
Start the engine.
Push the choke knob in partially until the engine is running smoothly.
Continue to push the choke adjustment knob in slowly as the engine is warming up.
Push the choke adjustment knob fully in when the engine has warmed up.