Briggs & Stratton 391065 Engine Carburetor

The Briggs & Stratton 391065 Engine Carburetor supports fuel metering for the mower engine, with common carburetor faults appearing as starting trouble, stalling, surging, or hesitation.

This Part Fixes the Following Issues:

• Engine takes repeated attempts to start.

• Engine quits while idling.

• Speed rises and falls unexpectedly.

• Throttle response becomes sluggish.

• Fuel delivery becomes irregular.

Restricted Fuel Passage

Quick Check: Check the carburetor area for signs of restricted fuel movement or residue buildup.

Fix Suggestion: Clean the affected passage and inspect nearby fuel-routing components for obstruction.

Prevention Tip: Store fuel properly and keep the fuel supply free from dirt and debris.

Engine Stalling at Idle

Quick Check: Start the mower and observe whether the engine remains running without repeated speed drops.

Fix Suggestion: Inspect the idle fuel circuit for deposits that may interrupt fuel flow.

Prevention Tip: Include carburetor inspection when performing seasonal engine servicing.

Erratic Engine Speed

Quick Check: Listen for repeated changes in engine speed while the throttle remains unchanged.

Fix Suggestion: Examine fuel delivery and carburetor passages for buildup that could disturb fuel metering.

Prevention Tip: Avoid using old fuel that has been stored beyond its recommended service period.

Delayed Throttle Response

Quick Check: Move the throttle gradually and watch for hesitation before engine speed increases.

Fix Suggestion: Check the throttle linkage for free movement and service the carburetor if fuel flow is restricted.

Prevention Tip: Keep the linkage area clean and inspect it during regular mower maintenance.

Customer Experience: Few mower owners reported that the engine became easier to start after replacing the carburetor and addressing residue around the fuel passages.