Well I've successfully removed almost all of the screws using hammer + chisel. Two screws that hold the point assembly had to be drilled out. Clutch and gear assembly has been removed. Now I have to open up the interior cases in order to reach the cam shaft assembly. (btw: piston is still attached to the connecting rod and I can't remove it still :S )
Sorry i've been super busy in the past few weeks. I will upload pictures and drilling video shortly 