Now here is the pictures and directions for adjusting the valves on my Honda TRX250, which would be used for working on your AC 4x4 motor.
---- Again start with a clean ATV and strip everything down so the work can be done easily. Set engine to TDC (removing the spark plug will make it a little easier to turn engine over) and remove the valve cover.
---- To tell if the motor is on its compression stroke or not the rocker arms should be a little loose and have a slight amount of play.
---- Checking the valve lash is the same idea, slide feeler gauge between the bottom of the rocker and top of valve. Both valves on my honda were loose and needed to be adjusted.
---- Adjusting the valves is a much easier job though then the DVX. Start by loosening the lock nut, while holding the adjuster screw secure.
---- Next tighten (or loosen) the adjuster screw until the valve lash spec is ment, when tighten you can jsut leave the feeler gauge in place and tighten until snug. While holding the adjusting screw firmly, retighten the lock nut and then double check the valve lash to be sure it is correct and didn't change.
---- Once all the valves are now in spec and everything is done, clean up the valve cover and head surfaces, apply a small amount of sealant and install the valve cover and tourque to spec. If possible now start the engine and listen for any off sounds, then finish putting your quad together