Shop genuine OEM Spark Plug parts for your Troy-Bilt Lawn Mower S4090B. Find compatible replacement parts and accessories to help complete your repair.

Small engine NGK spark plug (BPR6ES). If the engine does not start, the spark plug may be defective. The spark plug should be replaced periodically during regular maintenance.

NGK spark plug. The spark plug ignites the fuel and air mixture in the cylinder to power the engine. If the spark plug is burnt, fouled or damaged the engine may not start or may run rough.

Zfr6a-11 spark plug

NGK spark plug BPR9ES

NGK Spark Plug (B8ES)