Ferilter Carburetor for Kohler Courage SV Engines — Direct-Fit 20-853-33-S Replacement, 15–22 HP for 42/46/50" Mowers

High-quality Ferilter replacement carburetor designed to fit Kohler Courage SV-series engines and restore fuel delivery for 15–22 HP zero-turn and lawn tractors.

If your Cub Cadet, Troy-Bilt, Toro or similar mower with a Kohler Courage SV engine is running rough, hard to start, or flooding, this Ferilter carburetor is built as a direct-fit aftermarket replacement for a range of Kohler OEM numbers (including 20-853-33-S family). The unit ships with the mounting and linkage hardware shown in the product photos; before ordering, match the part number and mounting pattern on your old carburetor to ensure compatibility.

Which mower and engine models will this Ferilter carburetor fit?

This carburetor supports many popular zero-turn and lawn tractor models using Kohler Courage SV engines from the SV470 through SV620 series, covering roughly 15–22 HP. It’s commonly used on Cub Cadet, Toro, Husqvarna, MTD and Troy-Bilt machines where the original part numbers match the 20-853-xx family.

• Compatible Kohler engines: SV470, SV480, SV530, SV540, SV590, SV600, SV600S, SV610, SV620
• Mower sizes: 42", 46", 50" zero-turn decks and many lawn tractors
• Brands: Cub Cadet (LTX/LT/RZT series), Toro (Z4200/Z5000), Troy-Bilt, Husqvarna, MTD
• Replaces Kohler OEM numbers in the 20-853-33-S / 20-853-xx / 12-853-118-S families

How will this replacement carburetor affect starting and throttle response?

Installing a fresh Ferilter carburetor typically improves cold starts and provides steadier idling by restoring correct air-fuel mixture and float operation. It can eliminate hesitation and surging caused by worn or clogged OEM carburetors without requiring an overhaul of the whole fuel system.

• Restores correct float height and fuel metering for smoother starts
• Reduces stalling and surging at idle and light throttle
• Improves throttle response under load compared to a failing carburetor
• Ships with gaskets and mounting hardware for straightforward swap

What installation considerations and checks should I do before buying?

Confirm the old part number, bolt pattern, and linkage orientation before purchasing—several Kohler carburetors look similar but have different ports or choke linkages. Also inspect the fuel line, filter and tank for debris; replacing the carb alone won’t help if contaminants remain in the fuel system.

• Compare your OEM number with 20-853-33-S and related variants
• Check that throttle and choke linkages align and match the new unit
• Replace fuel filter and clean tank if fuel contamination was an issue
• Follow torque specs for mounting bolts to avoid air leaks

What comes in the box and what tools are needed?

The package includes the carburetor and the small hardware items shown in the main product photo so you have what's needed for a like-for-like swap. Basic hand tools and a few hours are usually all that’s required for a DIY replacement on most residential mowers.

• Included: Ferilter carburetor plus gaskets and mounting hardware as pictured
• Recommended tools: screwdrivers, ratchet set, pliers, fuel line clamps
• Estimated time: 30–90 minutes depending on access and experience
• Professional tune recommended if you’re uncomfortable with fuel systems

Who is this for: This Ferilter carburetor is for homeowners and small-property maintenance technicians who need a cost-effective replacement for worn or damaged Kohler carburetors on 15–22 HP engines. It suits owners of Cub Cadet, Toro, Troy-Bilt, Husqvarna and MTD zero-turns and lawn tractors who want a plug-and-play aftermarket unit—provided the part number and mounting details match their original carburetor.