most of the piston is in the exhaust port!View attachment 536444 View attachment 536445 I took the jug off , here are the pics
the intake side is smooth and the exhaust side around and above the exhaust port is not smooth but not very deep
or maybe it is raised?
to acid or not to acid to hone or not to hone ?
looking at the piston I ran out of rings on the exhaust side with plenty left on the intake side