ST100 951-14423 Carburetor For Cub Cadet SC100 SC500Z SC300HW SC300 SC500HW SC100HW SC500EZ Lawn Mower LE100 Edger ST100 Trimmer

What It Is

This is an aftermarket carburetor designed to replace the OEM Cub Cadet 951-14423 on select walk-behind mowers, edgers, and trimmers. It delivers the fuel-air mixture to the engine for starting and running.

Fitment & Compatibility

• Confirmed models: Cub Cadet SC100, SC500Z, SC300HW, SC300, SC500HW, SC100HW, SC500EZ, LE100 Edger, ST100 Trimmer.
• Engine check: Most of these use a 140cc or 160cc OHV engine (often Briggs & Stratton or LCT). Verify your engine’s model number under the fuel tank or valve cover.
• OEM vs aftermarket: This is a non-OEM replacement. It will have the same bolt pattern and gasket dimensions as the original 951-14423, but may lack the same internal tolerances.
• Measurements: The carburetor body width is roughly 2.5 inches, with two bolt holes spaced 1.5 inches apart. Compare to your old one before buying.

Key Things to Know

• Quality variance: Some units may need a light cleaning of internal jets with carb cleaner before installation. A few users report minor gasket alignment issues.
• Installation difficulty: Moderate. You’ll need to remove the air filter housing, fuel line, and throttle linkage. Have a small flathead screwdriver and pliers ready.
• Fuel line size: The inlet is standard 1/4-inch. If your mower uses a larger or smaller line, you may need an adapter or new fuel line section.
• Common gotcha: The choke linkage can be tricky to reattach. Take a photo of the original setup before disassembly.

Should You Buy It

If your Cub Cadet SC series mower, LE100 edger, or ST100 trimmer is hard to start, runs rough, or won’t idle, this is a cost-effective fix. It’s best for DIYers comfortable with basic small-engine work and willing to do a quick cleanup. Avoid if you need exact OEM fit or have a different model not listed.