20-853-33-S Carburetor for Kohler Courage 19 20HP SV600 SV590 Cub Cadet LT1045 LT1042 for SV610 SV530 SV610 SV470 SV600S SV620 LTX1042 LTX1045 Engine Lawn Mower Troy Bilt 16-22 HP Replace 20 853 35-S

What It Is

This is a direct-replacement carburetor for Kohler Courage single-cylinder engines (SV470–SV620) and many Cub Cadet, Troy-Bilt, and MTD lawn tractors from the mid-2000s to early 2010s. It meters fuel and air into the engine—if your mower won’t start, stalls, or runs rough, this part often fixes it.

Fitment & Compatibility

Before buying, check these three things:

1. Engine model – Must be Kohler Courage SV470, SV530, SV590, SV600, SV600S, SV610, or SV620. Look for the model number stamped on the engine shroud (not the mower deck).
2. OEM vs. aftermarket – This is an aftermarket replacement, not genuine Kohler. It cross-references to OEM part numbers 20-853-33-S, 20-853-35-S, and 20-853-37-S.
3. Mower models – Fits Cub Cadet LT1042, LT1045, LTX1042, LTX1045, and many Troy-Bilt 16–22 HP riders. Deck size doesn’t matter—only engine model and carburetor mounting pattern (two-bolt flange) do.

Practical check: Measure your old carburetor’s bolt spacing (center-to-center)—should be ~2.5 inches. If your engine has a different mounting pattern, this won’t work.

Key Things to Know

• Quality is acceptable for the price – It’s not OEM but works well for most users. A small percentage report needing to adjust the idle mixture screw or having a slightly stiff float.
• Installation is moderate – Expect to remove the air filter housing, fuel line, and two bolts. Budget 30–45 minutes. No special tools needed beyond a socket set and screwdriver.
• Common gotcha: gasket orientation – The carburetor-to-engine gasket must be installed with the correct side facing the engine. Reversing it causes vacuum leaks. Also, replace the fuel filter if you haven’t in a while—debris is a top cause of repeat carb failure.
• May need minor tuning – After installation, let the engine warm up, then adjust the idle speed screw (if it stalls) and the mixture screw (if it runs rich/lean). Turn the mixture screw in until it just seats, then back out 1.5 turns as a baseline.

Should You Buy It

If your Kohler Courage engine is surging, hard-starting, or won’t run, this $32 carburetor is a solid budget fix—just verify your engine model first. It’s not for professional landscapers who need OEM reliability, but for homeowners with a single mower, it’s a cost-effective way to get another season of use.