I own a 7hp Ottawa twin cylinder engine. It runs, but it’s got several parts that are missing/incorrect. The mag trip arm/eccentric are missing, and the rods have been welded together with different rods, to match the diesel pistons that have been fitted into it. What I’m wondering is are these parts the same as similar single cylinder log saw engine? I’d really like to put this engine back to correct if possible, and give it a proper restoration, since it’s so rare.