1685321-S Carburetor for Kohler 7000 Series Engine 22HP 23HP 24HP 25HP 26HP KT725 KT730 KT735 KT740 KT745 Engine Parts for Cub Cadet Toro Lawn Mower

What It Is

This is an aftermarket carburetor designed for Kohler 7000 Series engines (22–26 HP) used on Cub Cadet, Toro, and other lawn tractors. It replaces the OEM part 1685321-S and is meant for machines with KT725, KT730, KT735, KT740, or KT745 engines.

Fitment & Compatibility

Before buying, verify your engine model number (e.g., KT725, KT745) and that it has a side-draft carburetor mount. This carb fits many Cub Cadet XT and ZT series zero-turn mowers, plus Toro TimeCutter and Titan models with Kohler 7000 engines. Check your OEM part number – if it’s 1685321-S, this is a direct swap. Measure the mounting flange: it should be 2.5 inches wide with two bolt holes 3.25 inches apart. Not compatible with vertical-shaft or older Kohler Command engines.

Key Things to Know

• Quality varies – This is an aftermarket unit. Some users report needing to adjust the idle mixture screw (turn 1.5 turns out initially) for proper running.
• Installation difficulty – Moderate; expect 30–60 minutes. You’ll need to transfer the old gasket, bowl, and float from your original carb if included parts don’t fit perfectly.
• Common gotcha – The included gasket may be too thin. Reuse your original if possible, or buy a separate gasket kit to prevent air leaks.
• No warranty support – At this price, returns are possible but don’t expect manufacturer support. Test immediately after installation.

Should You Buy It

Buy this if you have a Kohler 7000 Series engine with a confirmed 1685321-S part number and want a budget fix for a non-running or surging mower. It’s a good value for DIYers who can handle minor adjustments, but skip it if you need a guaranteed plug-and-play part or have a zero-turn with tight access – pay more for an OEM carb instead.