Carbhub 20 853 33-S Carburetor for Kohler 20 853 01-S SV590 SV591 SV600 SV601 SV610 SV620 CV490 CV491 CV492 CV493 19-22HP Engine Carburetor for Toro 13BX60RG744 13BX60RG748 Lawn Mower Tractor Carb

What It Is

This is an aftermarket carburetor replacement for Kohler V-twin and single-cylinder engines in the Courage, Command, and Pro series, commonly used on Toro lawn tractors like the 13BX60RG744 and 13BX60RG748. It delivers fuel to engines from 19 to 22 HP, including models SV590–SV620 and CV490–CV493.

Fitment & Compatibility

• Engine models: Directly replaces Kohler 20 853 01-S, 20 853 33-S; fits SV590, SV591, SV600, SV601, SV610, SV620, CV490, CV491, CV492, CV493.
• Tractor models: Compatible with Toro 13BX60RG744 and 13BX60RG748; also fits many other brands using these Kohler engines (e.g., Cub Cadet, John Deere, Husqvarna).
• Check before buying: Confirm your engine model number (stamped on valve cover or blower housing). Measure mounting bolt spacing and fuel inlet orientation—this carb uses a standard two-bolt flange, but some engines have slight variations. Verify the choke linkage style (manual vs. auto) to match your setup.
• OEM vs. aftermarket: This is a non-OEM Carbhub unit. It includes gaskets and often a fuel filter, but not the OEM Kohler solenoid or bowl drain.

Key Things to Know

• Quality variability: Many users report it works out of the box, but some need minor adjustment of the idle mixture screw or float height. Expect to tune it.
• Installation difficulty: Moderate—requires removing the old carb, swapping gaskets, and reconnecting fuel and linkage. Have a small screwdriver and needle-nose pliers handy.
• Common gotchas: The included gaskets may be thinner than OEM; use the old ones if they’re in good shape. Check for debris in the fuel bowl before first start. If your engine has a solenoid on the bowl, this carb doesn’t include one—you’ll need to transfer it or bypass it.
• Performance: Most users see improved starting and smoother idling vs. a clogged OEM carb. Not recommended if your old carb has a warped flange or stripped threads.

Should You Buy It

Buy this if your Toro or compatible tractor has a Kohler SV/CV engine with a gummed-up or failed OEM carb and you’re comfortable with basic carb tuning. It’s a budget-friendly fix ($18.88) that works for most users, but skip it if you want a drop-in, zero-adjustment replacement—go OEM for that.