Toro 121-4199 Spark Plug

Product Description

The TORO 121-4199 is a replacement spark plug designed for use in small gasoline engines commonly found in outdoor power equipment. Spark plugs ignite the air-fuel mixture in the combustion chamber, making them a critical component for reliable engine starting and smooth operation. This plug is sold as a single unit and is a direct OEM-style replacement intended for technicians and service professionals performing routine engine maintenance or tune-ups.

This spark plug is suited for residential and light commercial outdoor power equipment applications. It is appropriate for scheduled maintenance intervals or as a replacement when an engine exhibits hard starting, misfiring, or rough idling. Service technicians working on TORO-branded equipment will find this plug a straightforward drop-in replacement during standard tune-up procedures.

Key Features

• OEM TORO replacement spark plug for accurate fitment
• Single-unit quantity for individual engine service
• Compact dimensions support easy installation in tight engine bays
• Cross-reference designation RL87YC noted on product

Compatibility

Designed as an OEM-style replacement spark plug for TORO outdoor power equipment with compatible small gasoline engines.

Installation Notes

Spark plug replacement is typically performed by a small-engine technician or qualified service professional. Before servicing, disconnect the spark plug wire and allow the engine to cool completely. Use a proper spark plug socket and torque wrench to avoid overtightening or cross-threading during installation. Always verify the gap specification against the engine manufacturer's service manual before installing.