Good solution on tapping & countersinking & thought I was looking at case inducted jug, but wasn't 100% certain. The window holes in the piston and the added ports should perk it up.Yeah. You guessed it Rick! I'm thinking about making my own cylinder head. 1st I have to design and build an appropriate radius cutter for the chamber dimensions. That'll keep my brain fizzin' for awhile.
On head studs one of my shortcomings is in 1952 America when my lathe was new metric was still a foreign language. I can't cut an M6 X 1.0mm thread. But I can tap it so I'm thinking countersunk nuts on top of matching cuts in the cylinder base riding on the 4 head bolts. That should lock the jug down in the same place every time.
This is a case inducted motor, no intake port at all, so reeds are the only option. I am planning on a pair of indexed holes in the back of the piston to feed the boost ports tho. The "slots" are only .150 deep. I can't imagine a lot of air will get up past the piston without some holes to help fill them.
Doing all I can to get all I can get out of all 47cc's! I dunno why. But it makes me happy.