594605 Carburetor for Brigs and Straton 594601 591734 595535 792768 591736 594603 14.5-19.5HP 17.5HP Engines

What It Is

This is an aftermarket carburetor designed for Briggs & Stratton single-cylinder engines in the 14.5 to 19.5 HP range, commonly found on walk-behind mowers, riding mowers, and zero-turn mowers. It replaces OEM part numbers 594601, 591734, 595535, 792768, 591736, and 594603.

Fitment & Compatibility

Before buying, confirm your engine’s model type and code numbers (stamped on the valve cover or blower housing). This carburetor fits Briggs & Stratton engines with a vertical shaft and a 1-inch bore intake. It is not universal—check that your engine uses a fixed-jet or adjustable-jet carburetor style. Measure the mounting flange bolt spacing (typically 2.5 inches center-to-center) and the fuel inlet fitting size (usually 3/16-inch barb). It will not fit engines with a different intake manifold pattern or engines smaller than 14.5 HP.

Key Things to Buy

• Quality variance: Aftermarket carburetors can have minor casting flaws or gasket fit issues. Inspect the gasket surface and clean any debris from the bowl before installation.
• Installation difficulty: Moderate. You’ll need a screwdriver, socket set, and possibly a small fuel line clamp. Expect 30-60 minutes if you’re replacing a carburetor for the first time.
• Common gotcha: The provided gaskets may be too thick or thin. Always reuse the original gasket if it’s in good shape, or buy a separate gasket kit (OEM part 591736). Also, check that the throttle linkage aligns with your engine’s governor arm—some aftermarket units require bending the linkage slightly.
• Fuel line compatibility: The inlet barb is standard 3/16-inch, but some older mowers use 1/4-inch fuel line. You may need a reducer or new fuel line section.

Should You Buy It

If you have a Briggs & Stratton engine in the 14.5-19.5 HP range with one of the listed OEM part numbers, and you’re comfortable with basic mechanical work, this is a cost-effective fix for a clogged or failing carburetor. It’s not for high-performance or commercial-use mowers where precise fuel metering is critical, but for residential use, it offers solid value at this price point.