How do you adjust valves on a kowisaki fd620d?

To adjust the valves on a Kawasaki FD620D engine, first ensure the engine is cool and remove the valve cover. Rotate the engine to the TDC (top dead center) on the compression stroke for the cylinder being adjusted. Use a feeler gauge to check the clearance between the rocker arm and the valve stem, and adjust as necessary by loosening the lock nut and turning the adjuster screw to achieve the specified clearance. Finally, re-tighten the lock nut and replace the valve cover.