1685321-S Carburetor for Kohler 7000 Series 22 HP 23HP 24HP 25HP 26 HP Engine, Carb for Kohler KT725 KT730 KT735 KT740 KT745 Lawn Mower, with Air Filter Turn Up Kits, Replace# 3285361, 3205347

What It Is

This is a complete carburetor replacement for Kohler 7000 Series engines (22-26 HP), specifically the KT725, KT730, KT735, KT740, and KT745 models. It also includes an air filter and turn-up kit, making it a drop-in fix for mowers that are hard-starting, surging, or running rich/lean due to a clogged or worn carb.

Fitment & Compatibility

• Engine series only: Confirmed for Kohler 7000 Series KT725, KT730, KT735, KT740, KT745. Does not fit KT610, KT620, or older Courage/Command series.
• OEM cross-references: Replaces Kohler #3285361 and #3205347. If your original carb has a different number, measure the mounting bolt spacing (typically 2.5" center-to-center) and the fuel inlet fitting size (3/8" barb is standard).
• What to check before buying: Look at your engine’s model number (stamped on the valve cover or blower housing). Confirm it starts with “KT7” followed by the digits above. Also verify your mower’s deck size is 42-60” – this carb is sized for mid-range residential/light-commercial mowers, not zero-turn or large commercial decks.
• Note: Aftermarket carb – may need minor adjustment of the idle mixture screw (turn 1.5 turns out from closed as a baseline). The included air filter may not match your original housing; check dimensions (approx. 5” x 3” x 2”) before installing.

Key Things to Know

• Quality: Good for the price but not OEM. The cast body and gaskets are serviceable, but the fuel bowl gasket may be thinner than Kohler’s; use a dab of grease to seal it.
• Installation difficulty: Moderate (30-60 minutes). You’ll need a 10mm socket, flathead screwdriver, and possibly a small pick for old gasket removal. No special tools required.
• Common gotcha: The “turn-up kit” includes a new air filter and fuel line – but the fuel line may be too short for some mowers. Keep your original line if needed. Also, the carb comes with a plastic spacer – if your engine uses a metal one, reuse the original.
• Priming: After installation, prime the fuel system by turning the engine over 3-4 times with the throttle wide open (no spark) to fill the bowl, or use a squirt of starting fluid if it’s stubborn.

Should You Buy It

This is a solid budget fix for a Kohler 7000 Series mower that’s otherwise running well but has a failing carb. It’s right for DIYers who want a quick, complete replacement without sourcing separate gaskets or filters. Skip it if you need an exact OEM match for warranty reasons, or if your engine has other issues (valve lash, low compression) – the carb won’t solve those.