Here's what mine measures... its a large crankcase, single wide ports, single ring piston, bolt-on mag shield, non-recessed reed mount.

1.285" stroke
1.378" bore
.313" crank pin dia.
2.208" dia. inside the crankcase at the backplate mounting area
2.352" rod length, both pistons (old single ring and new two ring).
.400" wide x .950" deep, single, wide, ports, one on either side in the head.
2.135" diagonal measurement of bolt spacing for the backplate holes.