Special tools: I don't THINK so. I don't remember using any special tools on my engine other than a fly wheel puller.

Cylinder head: looks like a perfectly usable head!

Cylinder: depending on what bore it's already on it may or may not be usable. Those are some pretty serious gouges! Sheesh!!

Stator: in my experience it doesn't really matter how the stator looks, it's how it actually works. That being said, if it was running your bike before it will still be good. You can always change the source coil as just a precaution