Is anyone familiar with the older "Kioritz model G1" points type engine? As I measure it both the bore and stroke are 1" (2.5c ?) I think this translates into 12.2 cc. That can't be right. Any help will be appreciated.

Not far out. My old book says 1.020 bore and stroke. 13.8 cc. or .84 cu. in. for the G 1.