Please tell me... Why is there river sludge in the front cylinder?

The rear piston and cylinder look pretty good for not operating within a year or more.

Anyway, I gripped the cylinders, thinking the whole engine would lift. I wish I had a camera on my face when the cylinders just slipped up and off the pistons!


Looks like I have my work cut out for me. Hopefully I will not need to split the engine case, but first things first. The pistons, heads and cylinders need to be completely disassembled and checked. Hopefully they can be restored but I have a bad feeling about that front cylinder and piston.