Autolite Small Engine Spark Plug 3924 provides reliable ignition for a variety of outdoor power equipment. This copper core plug is designed to meet original equipment standards, offering consistent performance and durability for motorcycles, lawn mowers, chainsaws, and leaf blowers. It serves as a direct replacement for Champion RC12YC, RN11YC4, and RN9YC, as well as NGK BCPR5EY, BKR5E, BKR5EY, and BKR6E, and Briggs & Stratton 496018S. Manufactured approximately in 2019.