Mtd Southwest 49MB4SPP953 4-cycle Spark Plug

Product Description

The MTD SOUTHWEST 49MB4SPP953 is a 4-cycle spark plug designed for small engine ignition applications. Spark plugs in this class fire the air-fuel mixture in the combustion chamber, and a worn or fouled plug leads to hard starts, rough running, and reduced fuel efficiency. This plug features a 5/8-inch hex size for straightforward socket wrench installation. It is a direct-fit replacement intended for outdoor power equipment powered by 4-cycle gasoline engines. Small engine technicians and experienced DIYers handle routine spark plug replacement as part of seasonal maintenance or troubleshooting.

This spark plug is suited for residential outdoor power equipment running 4-cycle engines, including walk-behind lawn mowers and similar small engine platforms. It is a single-unit replacement part, making it practical for one-machine service calls or maintenance kits. Installation is straightforward and fits within standard seasonal tune-up workflows.

Key Features

• 5/8-inch hex size for standard spark plug socket compatibility
• Designed for 4-cycle gasoline small engines
• Single-unit packaging suitable for individual machine service
• Lightweight at 0.1 pounds for easy handling and shipping

Compatibility

Designed as an OEM-style replacement spark plug for 4-cycle small engine outdoor power equipment. No specific model compatibility data was provided in the product information.

Installation Notes

Disconnect the spark plug wire before removing the old plug to prevent accidental engine start. Use a spark plug socket and torque wrench appropriate for small engine service. Gap the replacement plug to the engine manufacturer specification listed in the equipment service manual before installation. Proper seating without over-tightening prevents thread damage in the aluminum cylinder head.