15. Setting valve lash can be a bit confusing, but one of the surest ways to do it right is the “intake opening, exhaust closing” method. Turn the engine over clockwise watching the intake valve’s rocker arm for the cylinder you’re adjusting. When it begins to open, lash that cylinder’s exhaust valve. Continue turning the engine over clockwise and watch for the exhaust valve to open and then almost completely close. Set the intake lash when the exhaust is about half-closed.