[Lifetime Warranty] 591137 Carburetor - For Troy Bilt 7.75Hp 8.75Hp 8.5Hp 190CC Pressure Washer B&S 850ex 875exi 875ex 775ex Lawn Mower - Replaces 591137 590948 590948 594287 799248

591137 Carburetor

Key Features

• Precision Fuel Calibration:Engineered to provide the exact air-fuel ratio required for optimal combustion in high-displacement small engines.
• Robust Internal Components:Includes a pre-installed float, needle valve, and specialized seals to prevent leaks and ensure consistent fuel delivery.
• Ethanol Resistance:Constructed with alloy materials designed to withstand modern ethanol-blended fuels and prevent internal oxidation.
• Direct Fit Design:Manufactured to match original equipment dimensions for a straightforward bolt-on installation without modifications.
• Performance Restoration:Calibrated to restore engine RPM stability and eliminate surging or stalling under load.

Replaces / Cross-Reference Part Numbers

• Briggs & Stratton:591137, 590948, 594287, 799248
• Aftermarket Substitutes:Fits various 190cc engine carburetor replacements designed for the 775, 850, and 875 series.

Compatibility & Fitment

• Engine Series:Specifically designed for Briggs & Stratton 775ex, 850ex, 875ex, and 875exi series engines (190cc).
• Horsepower Ratings:Compatible with 7.75 Hp, 8.5 Hp, and 8.75 Hp vertical shaft engines.
• Equipment Types:Used primarily on Troy-Bilt, Craftsman, and Husqvarna pressure washers and high-performance walk-behind lawn mowers.
• Common Models:Fits Troy-Bilt pressure washer models utilizing 020486, 020489, and 020547 frame configurations.

When to Replace

• Hard Starting:Engine requires multiple pulls or refuses to start despite having fresh fuel and a functional spark plug.
• External Leaks:Visible gasoline dripping from the air filter housing or the carburetor bowl gasket.
• Engine Surging:Inconsistent engine speed ("hunting") while the machine is running at full throttle.
• Power Loss:Engine bogs down or stalls when the pressure washer trigger is engaged or the mower enters tall grass.
• Fuel Contamination:Internal jets and passages are obstructed by varnish or debris from old fuel.

Installation Tips

• Document Linkages:Photograph the throttle and choke linkage configuration before disassembly to ensure correct re-engagement.
• Fuel Line Service:Inspect the fuel line for cracks or brittleness; replace the line and install a new fuel filter during carburetor installation.
• Gasket Sealing:Ensure the mounting surface is clean and the intake gaskets are perfectly aligned to prevent air leaks that cause lean running.
• System Flush:Drain and flush the fuel tank to remove any debris or water that could contaminate the new carburetor immediately.
• Hardware Torque:Tighten mounting bolts evenly to prevent warping the carburetor body or the intake manifold.