I bought this motor as a parts motor for literally next to nothing. In the interest of learning I checked the plugs. One looked like this. 
It is from cylinder 1. I then put an endoscope in and removed that bypass cover. The top of the piston was clean comapred to the other 3 (metallic grey as opposed to light brown residue on other three). On the edge of the top of the piston there appears to be chips or flakes that have come off. No obvious severe scoring on the cylinder walls. Rings intact.
What is the likely cause? Is it likely water in the cylinder from blown head gasket? I'm guessing that even if the compression is good that its unlikely it would ever run properly again without a new piston in that hole. Just want to be sure its no good before I rip the motor down.
It is from cylinder 1. I then put an endoscope in and removed that bypass cover. The top of the piston was clean comapred to the other 3 (metallic grey as opposed to light brown residue on other three). On the edge of the top of the piston there appears to be chips or flakes that have come off. No obvious severe scoring on the cylinder walls. Rings intact.
What is the likely cause? Is it likely water in the cylinder from blown head gasket? I'm guessing that even if the compression is good that its unlikely it would ever run properly again without a new piston in that hole. Just want to be sure its no good before I rip the motor down.
