16-853-21-S Carburetor Repair Kit, Replacement for Kohler KT725, KT730, KT735, KT740, KT745 Engines, Replaces 32-853-34-S, 32-853-50-S, 32-853-63-S

What It Is

This 16-853-21-S carburetor repair kit is a replacement service kit designed to rebuild the carburetor on Kohler Courage, Command PRO, and 7000 series engines, specifically models KT725, KT730, KT735, KT740, and KT745. It’s intended for use in zero-turn mowers, riding tractors, and commercial mowers powered by these engines.

Fitment & Compatibility

Before buying, confirm your engine model number (e.g., KT735) is stamped on the valve cover or engine shroud. This kit replaces OEM part numbers 32-853-34-S, 32-853-50-S, and 32-853-63-S. It is an aftermarket alternative, not genuine Kohler. Check that your carburetor is a Nikki or Walbro type (common on these engines) and that the kit’s gaskets, diaphragms, and O-rings match your carburetor’s bore and bolt pattern. No deck size or mower brand check is needed—only engine model matters.

Key Things to Know

• Quality varies: With only one review, this aftermarket kit may have fitment or material differences from OEM. Inspect gasket thickness and O-ring softness before installation.
• Installation difficulty: Moderate. You’ll need to remove the carburetor, disassemble it, clean all passages with carb cleaner and compressed air, then install the new parts. A service manual or video for your engine model helps.
• Common gotcha: The kit may lack the accelerator pump diaphragm or return spring for some carb versions. Compare contents against your old carb’s parts before starting.
• Not a complete carburetor: This is only a rebuild kit. If your carb body is warped, cracked, or has stripped threads, you’ll need a full carburetor assembly.

Should You Buy It

Buy this kit if you have a Kohler KT725–KT745 engine with a clogged or leaking carburetor, you’re comfortable with a full carburetor disassembly and cleaning, and you want a budget-friendly fix over a $60–$100 OEM kit or new carb. Skip it if you prefer guaranteed OEM fit or if your carb body is damaged—in that case, buy a complete replacement carburetor.