21986082317277 Parts

This is a replacement rocker arm adjuster that is specifically designed for use in select lawn mower engines. The rocker arm adjuster attaches to the rocker arm, which is responsible for opening and closing the valves on the engine responsible for injecting fuel and air. By doing this, it impacts the horsepower and performance of the engine. Over time, rocker arm adjusters can become lost or damaged. If they are not functional or are missing, the rocker arm will not be able to open and close the valves appropriately and the engine may not function at all. This genuine OEM rocker arm adjuster is manufactured to exact standards for Briggs & Stratton engines and is designed to offer an exact replacement for the part that came with the machine originally. This part can also be used as a replacement on select models from Toro and Lawn Boy, with over 150 machines that can use this rocker arm adjuster in total. The part is made of durable materials and sold as an individual unit. No additional hardware or parts are included. Never perform repairs on a hot engine and always wear gloves for hand safety.