Upgrade your engine's performance with the Rotary 11649 Spark Plug NGK BMR4A Solid S25 Shop Pack. This high-quality spark plug from Rotary is designed to provide a powerful spark for efficient fuel combustion, resulting in improved engine power and fuel efficiency. The NGK BMR4A Solid S25 Shop Pack is perfect for use in various small engine applications, including lawn mowers and chainsaws. With its easy installation and reliable performance, the Rotary 11649 Spark Plug is a must-have for any engine enthusiast. Trust in the Rotary brand and upgrade your engine's performance today with the 11649 Spark Plug.