The part that Hellkitty posted helped me figure out that the lower end of my cylinder says 124cm³
https://www.ebay.com/itm/Cylinder-Re...item51f1056c5b
The part I had listed before was for a 52.4mm which is apparently mislabeled 110cc engines. This one here seems to look exactly like the same setup I have.
Would it be okay to use the current head but just do a rebuild on the cylinder and piston?