Bought this for lower unit parts but top end looks so clean I cannot resist trying to get it to run. Was told by seller it seized up during winter storage. He shot PB Blaster into spark plug holes but didn't remove the head. I removed head, it came off easily. Cooling passages need some cleanout but not terrible. Pistons cylinders had quite a bit of carbon. Soaking with Pistons facing upward now using Liquid Wrench. Had good luck in past unseizing single cylinder lawnmowers by soaking and tapping wooden blocks to single piston. This outboard has both Pistons in mid-cylinder position/stroke. Question is which piston should I tap downward? I am thinking lower piston....any other tips for unseizing? Thanks in advance...