I went ahead and removed the sprocket cam bolt, then rotated the crank 180 degrees and removed the other sprocket cam bolt, then removed the cam sprocket and the cam shaft and bearing noting that the sealed side of both bearings face outward.
Everything going along well and I removed the head bolts and head.
The piston didn?t look too bad, it is a Honda KT1, but I don?t see an indication if it is a std, a .25 or a .50.