AUTOKAY Carburetor Replacement for 14–18 HP Intek & Toro Engines — Fits 591731/594593, Complete Install Kit

AUTOKAY 594593 / 591731 is a direct-fit carburetor replacement kit designed to restore fuel delivery and throttle response on compatible 14–18 HP Intek and Toro riding-mower engines.

If your compact tractor or riding mower has a leaking, clogged, or damaged carburetor, swapping in this AUTOKAY assembly gives you a complete, ready-to-install solution. The kit replaces several OEM part numbers, fits a broad range of Nikki and Intek engine families, and includes the small parts you need to finish the job without multiple trips to the parts store.

Will this carburetor fit my engine and mower model?

Check the OEM numbers and engine codes first: the AUTOKAY 594593 / 591731 matches many commonly used part numbers and engine series. It lists compatibility with Nikki 21B000 and a long list of Intek 14–18 HP engine variants, plus multiple Toro model references for riding lawn mowers.

• Replaces part numbers: 591731, 594593, 796109, 590400 and many more.
• Fits Nikki 21B000 and 21B807 engines.
• Compatible with Intek series: 14 HP, 17.5 HP, 18 HP and numerous 28/31 engine codes.
• Referenced Toro models: 71427, 74325, 74327, 74419, 74571 and related riding mower part numbers.

What comes in the package and what do I need to install it?

The kit arrives with the carburetor plus essential installation parts so you can replace the unit right away. Basic hand tools and a few minutes of mechanical experience are all that’s required for the swap; follow safe fuel-handling practices and engine shutoff procedures.

• Included: 1x carburetor, 1x gasket, 2x hose clamps, 1x fuel line, 1x fuel filter, 1x shut-off valve, 1x spark plug.
• Tools typically needed: wrench set, screwdriver, pliers, shop rags, fuel container for drainage.
• Installation notes: match mounting holes and linkage, ensure fuel line seating, and tighten clamps to avoid leaks.

How does this replacement compare to the original part?

The AUTOKAY unit is manufactured to meet the fit and function of the listed OEM part numbers and restore original fuel flow characteristics. While aftermarket parts can vary, this kit focuses on interchangeability and convenience by including a gasket, filter and fuel hardware for a complete replacement.

• Form-fit design mirrors OEM mounting and inlet/outlet positions.
• Includes consumables so you avoid sourcing small components separately.
• Intended as a direct replacement for many 591731/593514/594593 family parts.

Any maintenance tips after installing the carburetor?

After installation, run the engine and check for leaks, stable idle, and correct throttle response. Periodic maintenance and fresh fuel will extend the life of the carburetor and help prevent common problems like clogged jets or varnished passages.

• Inspect hose clamps and shut-off valve for leaks after first start-up.
• Replace the included fuel filter annually or if fuel flow is restricted.
• Use clean, stabilized fuel and run the mower periodically to keep passages clear.

Who is this for: This AUTOKAY replacement carburetor kit is aimed at DIY lawn equipment owners, small-engine mechanics, and service shops that need a cost-effective, ready-to-install replacement for 14–18 HP Intek engines and many Toro riding mower models. If you have a matching OEM part number or the listed engine codes, this kit supplies the carburetor plus the small parts required to complete a fast, reliable swap.