1685321-S Carburetor for Kohler 7000 series Engines KT725 KT730 KT735 KT740 KT745 Lawn Mowers 22HP 23HP 24HP 25HP 26HP Carb Engine with Air Filter

What It Is

This is a complete replacement carburetor assembly (part #1685321-S) designed for Kohler 7000 series V-twin engines found on many residential zero-turn mowers, lawn tractors, and commercial walk-behinds. It includes an air filter and gaskets, making it a drop-in fix for fuel delivery issues like hard starting, surging, or poor performance.

Fitment & Compatibility

Before buying, confirm your engine model is one of these: KT725, KT730, KT735, KT740, or KT745 (22–26 HP). Check the engine’s model number—usually stamped on a metal tag near the blower housing or valve cover. This carburetor does not fit single-cylinder Kohler engines or other series (e.g., Courage, Command). It is not OEM Kohler; it’s an aftermarket replacement. Measure the mounting stud spacing (typically 2.75” center-to-center) and verify the fuel inlet is a 90-degree barb (common on these models). Air filter included may differ from OEM—compare to your old one.

Key Things to Know

• Quality varies: Aftermarket carbs often require minor adjustments (idle screw, float height) for smooth operation. Expect to tweak the mixture screw—start at 1.5 turns out.
• Installation difficulty: Moderate. You’ll need basic tools (screwdrivers, socket set) and patience to clean old gasket surfaces. Watch for fuel line leaks if the barb is slightly different.
• Common gotcha: The included air filter may not seal perfectly with your existing housing—test fit before reassembling. Also, the choke linkage may need bending to match your cable.
• No warranty support: Most sellers offer only 30-day returns. Test immediately upon install.

Should You Buy It

This is a budget-friendly option if you’re comfortable with minor tuning and have a Kohler 7000 series engine (KT725–KT745) that needs a carburetor swap. It’s not for someone wanting a perfect OEM fit or zero adjustments—if that’s you, buy a genuine Kohler carburetor (part #52 853 01-S). For the price, it works well for DIY repairs on older mowers where cost matters more than exact factory specs.