Hi,
The 3”aluminum round stock will be the new finned cooling jacket for the
cylinder in the third pic, that one had it’s fins turned off.The plan is just a real light press fit for good heat transfer. Basically this is just for fun. Plus I wanted to get away from the "fancooled" look of the cylinder.

I’ll make up a head button like are used in R/C cars for a little CM-6 NGK
plug I picked up.Not sure how many cc’s to set the head up for yet.

I’ve picked up the exhaust port location on that stock, and will mill a flat and port to mount an exhaust stub tomorrow.

This is a pic (if it loads)of the head button style I have in mind. (not mine)

There is no practical reason for doing this I’m afraid…