HiOctane, I guess I should try muriatic acid first. From what I understand, since the cylinder is plated and much harder than the aluminum piston, what I feel and see is most likely a "buildup" of aluminum that got deposited from the piston to the cylinder wall when the piston started "melting". This means acid will likely break it loosed leaving a still smooth cylinder wall underneath. If this works and there is minimal to no scoring of the cylinder wall, should I just stick a piston/rings in it after using the acid or does it need a light hone of some sort? If so, specifically how do I need to do this?