[rotorwrench]

The generator armature may be toast if the solder melted out. As long as the fuel pump and carburetor didn't drip down into the engine then it should be easy to clean up. Cast iron can take a lot of heat if there was still coolant in the water jackets. Fire has a tendency to carry the heat up and if there was no fire directly on the engine then it likely has no internal injury. The fuel has a tendency to boil out if it's contained well enough. It takes air for the fuel to burn so containment can keep that from happening.