YAMAKATO carburetor replacement for Briggs & Stratton 7.75–8.75 HP engines — 591137 kit with gaskets & fuel filter

The YAMAKATO 591137 carburetor is a complete aftermarket replacement kit engineered to restore fuel delivery for compatible Briggs & Stratton, Toro, Troy-Bilt and Husqvarna small engines.

When an engine runs rough, won’t idle, or struggles under load, the carburetor is often the source. This YAMAKATO assembly replaces OEM part numbers 591137, 590948 and compatible variants (593599, 594287, 799248) and ships as a ready-to-install kit with gaskets, a fuel filter and an OEM-standard spark plug. It’s sized for 7.75–8.75 HP and common 175cc–190cc applications including pressure washers, walk-behind mowers and select Troy-Bilt and Toro models.

How does this replacement carburetor match my Briggs & Stratton engine?

The unit is built to fit a range of Briggs & Stratton model numbers and physical mounting patterns associated with 7.75–8.75 HP engines. It follows OEM dimensions and connection points so carburetor swaps are typically bolt-on with standard linkages and fuel lines.

• Direct compatibility with part numbers 591137 and 590948.
• Works with many 111P, 114P, 121 and 121Q series engines listed in OEM cross-reference.
• Designed for 175cc–190cc displacement engines (7.75–8.75 HP).
• Includes gaskets and fuel filter to simplify installation.

Will this carburetor work in my Toro Timemaster or Troy-Bilt mower?

Yes — the YAMAKATO 591137 is compatible with select walk-behind and mower applications where the OEM part numbers align. It’s suitable for Toro Timemaster 30" and a range of Troy-Bilt professional and consumer models that use the referenced Briggs & Stratton engines.

• Fits Toro Timemaster 30" models that accept OEM carb numbers listed.
• Fits Troy-Bilt Tb360 Professional Series and similar Troy-Bilt units.
• Useful for Husqvarna models that share the same engine family and mounting.
• Check your engine plate or manual for exact OEM part number match before ordering.

What comes in the package and what tools will I need?

The kit arrives with a fully assembled carburetor plus the small parts needed to complete a straightforward replacement. Basic hand tools are usually sufficient for the swap; professional help is recommended if you’re unfamiliar with small-engine fuel systems.

• Includes 1x YAMAKATO 591137 carburetor, 1x fuel filter, a full gasket set and 1x OEM-standard spark plug (with resistor).
• Common tools: screwdrivers, socket set, pliers, and a torque wrench for valve/engine reassembly where applicable.
• Recommended: clean bench, container for small fasteners, and service manual or diagram for your model.
• Note: this is an aftermarket part; check manufacturer guidance about warranty or CARB certification if required.

How will this carburetor affect engine performance and maintenance?

Replacing a worn or clogged carburetor with this YAMAKATO assembly can restore proper idle, throttle response and fuel flow, reducing stalling and rough-running symptoms. Regular maintenance of fuel filters and fresh fuel will prolong service life.

• Restores consistent fuel metering and idle stability for compatible engines.
• Supplied gaskets and filter reduce the risk of vacuum leaks and contamination.
• Periodic cleaning and using fresh gasoline prevents premature fouling.
• If problems persist, inspect ignition, compression and fuel delivery components.

Who is this for: The YAMAKATO 591137 carburetor kit is aimed at DIY mechanics, landscapers and equipment owners who need an affordable aftermarket replacement for small engines in mowers, pressure washers and other walk-behind equipment. It’s ideal for anyone with a Briggs & Stratton engine that lists the referenced part numbers who wants a complete swap kit (carburetor, gaskets, filter and plug) to get equipment back into service quickly. Always verify compatibility with your engine model plate and consult the original equipment manufacturer if warranty or emissions certification is a concern.