I bought an OB2 last year to restore and it came with a box of spare parts. One of the spare parts was a flywheel with an OB2c stamped similar to your’s. I showed this to Muncie expert and he thought it was part of an early production run before they made a proper Motorgo casting. I notice the one in the picture has an underwater exhaust… not sure if that was original. I understand that the OB2c is a 1931 model. most of the parts have part numbers… the rope sheave is the correct model if it is original.
A little information is a dangerous thing!
