I needed to profile this head for a build. This head i think was for a 50cc, or something with a flat top piston, because there is no squish band or dome at all. I need it for my 48mm parmakit cyinder for my p6, which has a traditional domed piston. Instead of sending it out, I thought I'd experiment and try this crazy idea I had. Don't have a lathe, so I cobbled together this setup, which allows me to turn the spindle much more slowly and with more control, which works out anyway because this head has an asymmetrical shape that makes it severely unbalanced. Used a long piston stop for the chuck to grab, and it keeps it concentric with the spark plug hole. I slowly grind away with a dremel and a carbide, eyeballing the angles against the piston.
Worked decently! As I went on i got a better feel for what feed rate and pressure to use. Holding the dremel steady with one hand isn't easy,, so there's quite a bit of chatter in the end, but the basic shape is there! I can finish it off by mounting some sandpaper to the piston and spinning the head with a drill.
All in all I call it a success, we'll see how well it works (or doesn't)