Ok my first guess was wrong is not a full crank,and yes special tools are required you can make them however. I'll get you a link for that later. No you can't change those engines over as one what looks like a series 80 engine full crank. The other (the one you want to fix) is a powertorque (or should I say you can but they are different and maybe the holes won't line up). There was a guy on eBay selling rebored blocks and piston for them. I will have a look when I get home today. You might even be better to go to your local tip shop and get one. Those mowers are every where.
