The first thing you needed to do is oil the cylinders. The second is clean all the of those carbs and be sure all the jets are wide open. Then since it was locked up mix your fuel 40:1. 3rd Take the starter apart and blow all the old carbon from the brushes out, polish the armature with some emery cloth, then lightly oil the shaft and bushings. If the brushes weren't wore out, it'll spin effortlessly and fast. After that, pull the gear case and have a look at the impeller. If it's crumbling replace it before you crank it or those fins will break off and go into the power head. Finally, crank it on a hose and don't over rev it until it's had a chance to run at idle a bit to get all the rod and crank bearings lubed. You also need to fix the positive wire from the solenoid to the starter or in the very least insulate it or you may arc up when you engage the solenoid.
On another note, what is all that black peeling stuff on the head and under the flywheel. Is that scorched paint? If so, it has been severely overheated. Hope not. Hopefully it's just a bad home done paint job. Those are good motors if treated right.
