20 853 33-S Carburetor for Kohler Courage SV470 SV480 SV530 SV540 SV590 SV600 SV610 SV620 CV490 CV491 CV492 CV493 15-22HP Engine Replacement for Toro Cub Cadet Lawn Mower Tractor

What It Is

This is a complete aftermarket carburetor replacement for Kohler Courage single-cylinder engines (SV470–SV620, CV490–CV493) used in lawn tractors, zero-turns, and garden tractors from Toro, Cub Cadet, and other brands. It replaces the factory carburetor when yours is clogged, warped, or leaking, restoring fuel delivery and engine performance.

Fitment & Compatibility

Before buying, verify:

• Engine model: Must be Kohler Courage SV470, SV480, SV530, SV540, SV590, SV600, SV610, SV620, or CV490, CV491, CV492, CV493 (15–22 HP, single-cylinder). Check the engine tag near the valve cover or blower housing.
• OEM equivalent: This replaces Kohler part numbers 20 853 33-S and 2085333S. If your original carb has a different number (e.g., 20 853 32-S), it may not match without adapter gaskets.
• Bowl shape: This carb has a plastic float bowl. If your original has a metal bowl, the mounting studs and fuel inlet orientation may differ—measure center-to-center bolt spacing (typically 2.5 inches) and inlet diameter (5/16 inch).
• Deck size irrelevant: Carburetor fitment depends only on engine model, not cutting deck size.
• Aftermarket note: Not a genuine Kohler part; may require minor gasket trimming or fuel line adjustment.

Key Things to Know

• Quality: At this price, it’s a budget replacement. The float and needle valve are functional but may not last as long as OEM. Expect to adjust the idle mixture screw (1.5 turns out is a common baseline).
• Installation difficulty: Moderate. Requires removing the old carb, cleaning the mounting surface, and swapping the throttle/governor linkage. No special tools beyond a socket set and Phillips screwdriver.
• Common gotchas: The included gaskets may be thin; use a smear of grease to hold them in place. The fuel inlet barb can be fragile—tighten gently. If the engine surges, check for air leaks at the intake gasket or a misaligned governor spring.
• Return policy: Some sellers require proof of fitment (engine model photos) for returns—keep the box until you confirm it runs.

Should You Buy It

Buy it if you have a Kohler Courage engine with a failed carburetor and want a low-cost, functional fix for a mower that’s not worth a $60+ OEM part. It’s fine for occasional residential use, but not for daily commercial duty or if you need exact OEM fitment. If your engine is a different Kohler series (e.g., Command, Confidant), skip this.