A new flywheel it will be. I only paid 99 cents and $11 shipping for it on ebay, so it'll make a great base for a bench grinder pedestal. The marine engine guy I got the 181 from has a stack of flywheels I can pick from. He was dumbfounded by the lack of holes in mine as he says the holes are where the drive hub bolts in the outdrive application. By the way, the one I have has the small counterbore for the disk hub that you describe, but also has the larger one. I don't know what the deal is with this flywheel.
Bob
