If a Nikasil or Cast iron cylinder has not been damaged and has had aluminum from a melted piston that has transferred onto the cylinder for a unknown reason, there is a chance it can be removed using muriatic acid. Once the aluminum is cleaned off, a light ball hone can be used to prep the surface by completing cross hatching for a new piston and rings. This only applies when the Nikasil coating or the cast iron cylinders are still usable.