Briggs & Stratton 593357 Carburetor

The Briggs & Stratton 593357 Carburetor controls fuel delivery for the lawn mower engines by mixing fuel and air before combustion. A carburetor effected by debris or wear may reduce engine responsiveness and interrupt normal mowing operation.

Common Issues:

• Engine surges while mowing at a constant speed.

• Fuel leaks around the carburetor bowl area.

• Engine emits black exhaust smoke.

• Poor acceleration when increasing engine speed.

• Carburetor develops varnish from old fuel.

Engine Requires Repeated Choke

Quick Check: Start the engine without the choke and observe whether it stalls as the choke opens.

Fix Suggestion: Inspect the fuel pickup for restrictions, flush contaminated fuel, and restore proper fuel flow before servicing internal carburetor components.

Prevention Tip: Store gasoline in sealed containers and use fresh fuel at the beginning of each mowing season.

Fuel Leaks From Carburetor Bowl

Quick Check: Look for wet spots around the bowl gasket and inspect the float bowl after shutting off the engine.

Fix Suggestion: Reseat the bowl gasket, tighten mounting screws evenly, and replace damaged seals only if leakage continues.

Prevention Tip: Periodically inspect fuel system seals for wear and avoid overfilling the fuel tank.

Engine Hesitates During Acceleration

Quick Check: Increase the throttle gradually and monitor engine response under light load.

Fix Suggestion: Lubricate throttle linkage pivot points, correct linkage alignment, and remove any debris restricting smooth movement.

Prevention Tip: Keep linkage components clean and inspect return springs during routine maintenance.

Black Exhaust Smoke

Quick Check: Inspect the choke plate and air filter for restrictions affecting incoming airflow.

Fix Suggestion: Open the choke fully, clean or replace the air filter if dirty, and inspect the carburetor for excess fuel delivery.

Prevention Tip: Replace clogged air filters at recommended service intervals and keep the intake area free of debris.

Customer Experience: Many users report smoother throttle response after servicing the carburetor and cleaning accumulated fuel residue.