951-14423 Carburetor Kit - Fits Lawn Mower Cub Cadet ST100 SC100 SC500 Craftsman MTD - Replaces 751-14423 951-14423-CM
951-14423 carburetor kit with air filter, spark plug, gaskets, fuel line, and filter for 159cc lawn mower engines.
951-14423 replacement carburetor for Cub Cadet and Craftsman 159cc lawn mower engines shown with performance graphic.
951-14423 carburetor kit components including carburetor, air filter, spark plug, gaskets, and fuel line for 159cc engines.
Dimensional diagram of 951-14423 carburetor kit components including gaskets, fuel line, spark plug, and fuel filter.
951-14423 replacement carburetor for 159cc lawn mower engines compatible with Cub Cadet, Craftsman, and MTD models.
Close-up detail views of 951-14423 lawn mower carburetor showing aluminum body, fuel inlet, and adjustment components.
Multi-angle view of 951-14423 carburetor for Cub Cadet and Craftsman 159cc lawn mower engines.
951-14423 carburetor replacement for 159cc lawn mower engines shown with engine troubleshooting symptoms graphic.
Replacement engine air filter for Cub Cadet and Craftsman lawn mowers with dimensions and material callouts.
Lawn mower air filter kit with pleated paper filter and foam pre-filter for 159cc engines.
951-14423 carburetor kit with air filter, spark plug, gaskets, fuel line, and filter for 159cc lawn mower engines.
951-14423 replacement carburetor for Cub Cadet and Craftsman 159cc lawn mower engines shown with performance graphic.
951-14423 carburetor kit components including carburetor, air filter, spark plug, gaskets, and fuel line for 159cc engines.
Dimensional diagram of 951-14423 carburetor kit components including gaskets, fuel line, spark plug, and fuel filter.
951-14423 replacement carburetor for 159cc lawn mower engines compatible with Cub Cadet, Craftsman, and MTD models.
Close-up detail views of 951-14423 lawn mower carburetor showing aluminum body, fuel inlet, and adjustment components.
Multi-angle view of 951-14423 carburetor for Cub Cadet and Craftsman 159cc lawn mower engines.
951-14423 carburetor replacement for 159cc lawn mower engines shown with engine troubleshooting symptoms graphic.
Replacement engine air filter for Cub Cadet and Craftsman lawn mowers with dimensions and material callouts.
Lawn mower air filter kit with pleated paper filter and foam pre-filter for 159cc engines.
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951-14423 Carburetor Kit - Fits Lawn Mower Cub Cadet ST100 SC100 SC500 Craftsman MTD - Replaces 751-14423 951-14423-CM

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951-14423 Carburetor Kit Compatible with Lawn Mower Cub Cadet ST100 SC100 SC500 Craftsman MTD 159cc Engine - Replaces 751-14423 951-14423-CM 951-05531 - Includes Air Filter & Spark Plug

Key Features

  • Direct replacement carburetor for specified 159cc engines.
  • Complete kit includes 1 carburetor, 1 air filter, 1 spark plug, 3 gaskets, 2 fuel filters, and 1 fuel line.
  • Pre-calibrated for standard operation.
  • Designed to meet original equipment specifications for fit and function.

Replaces / Cross-Reference Part Numbers

  • 951-14423
  • 751-14423
  • 951-14423-CM
  • 951-05531
  • 951-10298
  • 5X65RU
  • 6X65RU

Compatibility & Fitment

  • Engine: Fits specific MTD 159cc engines, including models 5X65RU and 6X65RU.
  • Cub Cadet Models: ST100, SC100, SC100HW, SC300HW, SC500, SC500EZ, SC500HW, SC500Z, LE100 Edger.
  • Craftsman: Compatible with select models using the listed part numbers.
  • MTD: Compatible with select models using the listed part numbers.
  • Troy-Bilt: Compatible with select models using the listed part numbers.

When to Replace

  • Engine will not start or is hard to start.
  • Engine runs rough, stalls frequently, or surges.
  • Black smoke from exhaust, indicating a rich fuel mixture.
  • Fuel leaks from the carburetor body or gaskets.
  • Noticeable decrease in engine power or fuel efficiency.

Installation Tips

  • Disconnect the spark plug wire for safety before starting installation.
  • Photograph the existing fuel line and linkage connections for reference.
  • Use a fuel line clamp or drain the fuel tank to prevent spills.
  • Clean the mounting surfaces thoroughly to ensure a proper seal with new gaskets.
  • Inspect and replace the fuel line if it appears cracked or brittle.
  • After installation, check for fuel leaks before starting the engine.

FAQ

This kit is designed for select 159cc 4-cycle lawn mower and wheeled trimmer engines across multiple MTD-family brands, including Cub Cadet, Craftsman, MTD, Troy-Bilt, Yard Machines, and Yard Man. Compatible models include Cub Cadet ST100, SC100, SC300HW, SC500, SC500EZ, SC500HW, SC500Z, and LE100; Craftsman 247.375000, 247.375910, and M105 model 11A-A2SD791; MTD RM120, RM210, RM220, and RM2210; and Troy-Bilt TB105, TB115, TB120, TB220, and TB270. Because fit can vary by engine build and serial range, match the part number and your mower or engine model before ordering.
This unit replaces OEM part numbers 951-14423, 751-14423, 951-14423-CM, 951-05531, 951-05531-AM, 651-05531, and 662566. If your original carburetor or parts list shows any of these numbers, this kit is the correct replacement.
This carburetor is compatible with select 159cc 4-cycle engines, including engine families 5X65RU, 6X65RU, 5X65MU, 6X65MU, 6X65QU, 5X65A, and 5X65B. These identifiers are useful when the mower model alone is not enough to confirm fit. Check the engine shroud label or equipment ID tag for an exact engine model match.
Typical carburetor-related symptoms include hard starting, surging at idle or under light load, stalling after a few seconds, hunting RPM, poor throttle response, black smoke from an over-fuel condition, fuel leakage, or an engine that only runs briefly on primer or starting fluid. On 159cc walk-behind mower engines, these issues are often caused by varnish from stale fuel, clogged jets, a sticking float needle, or degraded gaskets letting in air.
The most common root cause is old fuel, especially fuel containing ethanol. Ethanol can absorb moisture, form deposits in the main jet and emulsion passages, and harden seals over time. Other common causes are debris from a dirty fuel tank or deteriorated fuel line, restricted airflow from a plugged air filter, and long off-season storage with fuel left in the bowl. If the old carburetor failed due to contamination, replacing only the carb without addressing the fuel system can lead to repeat problems.
Drain old fuel from the tank, inspect the fuel line for cracking or soft spots, and clean the tank if sediment is present. Replace the air filter and spark plug if they are dirty or worn; this kit includes both, along with gaskets and fuel hose. It is also important to verify that the governor linkage and return spring are routed exactly like the original setup, and to inspect the intake mounting surface for old gasket material or air leaks before final assembly.
For most walk-behind mower or wheeled trimmer applications, this is a moderate DIY repair. A basic installation typically takes about 20 to 45 minutes if access is straightforward. Common tools include a screwdriver, needle-nose pliers, and a small socket set or nut driver. Take a photo of the linkage, spring positions, fuel line routing, and gasket order before removal, since incorrect governor or choke linkage placement is one of the most common installation mistakes.