How to adjust timing on 14hp tractor mower

The overhead valve engine requires a valve adjustment occasionally, this is done by removing the valve cover, turning the engine to top dead center on the compression stroke and going past top dead center 1/4". Then with a feeler gauge you set the valve clearance to .004, you can purchase a repair manual from your nearest Briggs & Stratton dealer that instructs you step by step on how to do this, the manual is less than $20.00 and is a great investment for a doitselfer.