I have a 19 kawai (FH601V) with 1200 hrs on it. I have heard of adjusting the valves but am not sure exactly as to how to do it and what the gap is supposed to be. I have a gap checker, and I know you want the piston at TDC to measure. Does anyone know what the gap is supposed to be? What all do you have to take off to do this? I am assuming the valve cover has to come off for sure. What do you actually do to adjust them? Is this something I dare do or leave it to the pro's?