Picco Motor ID

[Stephen Roberge]

I got this with an old Aeromarine I bought and there’s a question as to what size it is. Can anyone help me ID it? Thanks

 

[Jeff Lutz]

It can be a .67 or a .80. But with that steel flywheel and carb combo it could be the original .65 as well. See if it is stamped on the side of the engine lug. If not post the bore and stroke. Jeff Lutz