Hey guys.
I'm doing some engine work to modify the 500CC Carburated engine I have. I can't get the Magneto off the crank shaft. See image below. Is that black piece threaded on? Or is it pressed on? I used a gear puller and it didn't budge. But i also tried unscrewing it and it didn't budge. I hate to cut it off.

Any help would be greatly appreciated. I can't find much web or youtube support on this. It sort of seems people don't go as deep into this engine as I have.

Also, how is the connecting rod secured to the crankshaft? It looks like the crank is two halves pressed together.