20-853-33-S Carburetor for Kohler Courage SV470 SV480 SV530 SV540 SV590 SV600 SV610 SV620 Engines, 16-22HP Lawn Mower, Fits Troy-Bilt Cub Cadet Toro Husqvarna Zero Turn

What It Is

This is a complete carburetor assembly designed to replace the fuel system on Kohler Courage SV-series single-cylinder engines (SV470 through SV620), typically found on 16-22HP lawn tractors and zero-turn mowers from brands like Troy-Bilt, Cub Cadet, Toro, and Husqvarna.

Fitment & Compatibility

Before buying, confirm all three:

1. Engine model – Must be Kohler Courage SV470, SV480, SV530, SV540, SV590, SV600, SV610, or SV620. Check the engine shroud or valve cover for the model number.
2. Engine HP range – 16-22HP. This carb does NOT fit Kohler Command, Courage XT, or other series.
3. Physical dimensions – Measure the mounting flange hole spacing (approx 2.125" center-to-center) and the intake port diameter (approx 1.125"). Compare to your old carb to ensure bolt pattern and gasket match.

Common fitment notes:

• Fits most Troy-Bilt, Cub Cadet, Toro, and Husqvarna zero-turn and lawn tractor models with these engines.
• Aftermarket replacement, not OEM Kohler. Gaskets and mounting hardware are usually included, but verify before installation.

Key Things to Know

• Quality vs OEM – This is a budget aftermarket carb. Expect it to work well out of the box, but the throttle shaft and bowl gasket may wear faster than an OEM Kohler part. Fine for occasional use.
• Installation difficulty – Moderate. Requires basic hand tools, carburetor cleaner, and a new fuel filter. You’ll need to adjust the idle mixture screw (typically 1.5 turns out from lightly seated) and the throttle cable linkage.
• Common gotchas – The included gaskets may be thin or misaligned. Use a thin layer of gasket sealer on the intake gasket if you see air leaks. Also, check that the choke linkage moves freely before final mounting.
• Fuel system prep – Replace the fuel lines and filter at the same time. Old debris from the tank can quickly clog the new carb’s jets.

Should You Buy It

Buy this if you have a Kohler Courage SV-series engine with a failed or clogged carb, and you want a quick, cost-effective fix for a mower that’s not a daily commercial machine. It’s ideal for homeowners or light-duty use. If you need maximum longevity or run the mower commercially, spend more for an OEM Kohler carburetor.