Carburetor For Kohler Courage SV470 SV471 SV480 SV530 SV540 SV541 SV590 SV591 Toro 74363 74360 74380 Troy Bilt SV600 SV601 SV620 SV610 MTD LT1040 LT1042 LT1045 LTX1042 LTX1045 Mower engine 20-853-8-S

What It Is

This is an aftermarket carburetor for Kohler Courage single-cylinder engines (SV470–SV620 series) used on Toro, Troy-Bilt, and MTD lawn tractors (e.g., LT1040, LTX1042). It replaces the OEM carb to fix hard-starting, surging, or fuel-leak issues.

Fitment & Compatibility

• Engine models: Kohler Courage SV470, SV471, SV480, SV530, SV540, SV541, SV590, SV591, SV600, SV601, SV610, SV620.
• Machine fit: Toro (74363, 74360, 74380), Troy-Bilt, MTD (LT1040, LT1042, LT1045, LTX1042, LTX1045). Deck size doesn’t matter—only engine series does.
• OEM cross: Replaces Kohler 20-853-8-S. Verify your engine’s model/spec number (stamped on blower housing or valve cover) matches this list.
• Measurements: Standard bolt pattern and mounting flange for these engines. Check that fuel inlet and bowl orientation match your existing carb—some aftermarket versions may rotate the bowl slightly.
• What to check before buying: Confirm your engine is a Courage single (not twin), and that the carb gasket and mounting studs are included (this part usually comes with gaskets, but not always).

Key Things to Know

• Quality varies: Aftermarket carb may need minor tuning (idle speed screw adjustment) out of the box. Expect 70–80% of OEM reliability for half the price.
• Installation difficulty: Moderate—requires removing the air filter housing, fuel line, and throttle linkage. Take photos of linkage positions before disassembly.
• Common gotcha: The included gasket may be thinner than OEM; check for air leaks after install (use a dab of grease on the gasket if needed).
• Fuel system prep: If your old carb failed due to ethanol gum, clean the fuel tank and replace the fuel line/filter to prevent repeat issues.

Should You Buy It

If your Kohler Courage engine won’t start or runs rough and you’re on a budget, this carb is a decent fix for the price. It’s not OEM quality, but it’ll get your mower running again with basic mechanical skills. Skip it if you want plug-and-play reliability—buy the genuine Kohler carb instead.