The Briggs & Stratton 797242 Camshaft controls the timing of engine valve movement for proper combustion and reliable engine operation. This replacement camshaft rotates with the engine and uses its lobes to operate the valve train at the appropriate points in the combustion cycle. Proper camshaft movement supports coordinated valve opening and closing, consistent engine performance, ... https://www.wholetoolbox.com/briggs-stratton-797242-camshaft/797242.html