Smooth Operation: Proper mixture of fuel and air, keeps the engine running smoothly. The engine runs well. Applicability: The carburetor is a great replacement for Briggs Stratton 491031, 491026, 281707, 12HP Engine Carb. Fuel Saving: This carburetor is helpful to avoid oil waste to some extent. Easy to Install: This carburetor and fuel tank is very durable and also works well. Effect.Easy Installation: This is an aftermarket replacement part. Reliable quality and delicate workmanship persuade you to take this one to replace the old one.