14-853-49-S Carburetor for Kohler Courage XT-6 XT-7 Carb Kit XT675 XT650 XT173 XT149 Engine Toro 20371 6.75 149CC Parts 14 853 21-S 36-S 43-S 59-S

What It Is

This is a complete carburetor assembly (with gaskets) for Kohler Courage XT-Series single-cylinder engines, commonly used on Toro lawn mowers like the 20371 with 6.75 ft-lb or 149cc displacement. It replaces multiple OEM Kohler carb numbers and is a direct bolt-on for engine models XT675, XT650, XT173, and XT149.

Fitment & Compatibility

Before buying:

• Engine model: Must be Kohler Courage XT-6, XT-7, XT675, XT650, XT173, or XT149. Check the engine label (not just the mower model).
• Cross-reference OEM numbers: This part replaces Kohler 14-853-21-S, 14-853-36-S, 14-853-43-S, and 14-853-59-S. If your original carb ends in a different suffix (e.g., -10-S), verify dimensions or bolt hole spacing (standard on these engines).
• Mower deck size: Not relevant—this fits any mower with the compatible engine (most commonly 21–22” decks on Toro, but also used on Craftsman, Cub Cadet, etc.).
• Aftermarket vs OEM: This is an aftermarket replacement. It includes the carb, gaskets, and sometimes a fuel line or filter. It does not include a primer bulb or air filter.

Key Things to Know

• Installation difficulty: Moderate. You’ll need a socket set, pliers, and possibly a small screwdriver. Expect 30–60 minutes.
• Common gotcha: The supplied gaskets may be slightly thinner than OEM. Use a torque wrench on the mounting bolts (50–60 in-lbs) to avoid warping the carb base.
• Quality: Generally reliable for the price, but some units may have a loose float or debris in the bowl. Inspect and clean before install.
• Tuning: Most are pre-set from the factory, but you may need to adjust the idle mixture screw (turn 1.5 turns out as a starting point) if the engine surges or stalls.

Should You Buy It

Buy this if your Kohler XT engine runs rough, won’t start, or has a leaking carb, and you want a budget-friendly direct replacement without rebuilding the old one. It’s a solid choice for DIYers who don’t mind a little fine-tuning. Skip it if you prefer OEM parts for exact fit or if your engine has a different carb bolt pattern (rare on these models).