I am currently in the process of rebuilding a buddys kx250f that he drowned in a pond
Quite a bit of sand got sucked into the combustion chamber, but it obviously immediately died as it went under water. Looks like nothing was damaged, piston, valves, everything looks fine. Except that it has an athena cylinder on it, and the plating looks very weird. I cant even describe it so here are some pics:
I cant feel those marks with my fingernail, but also cant wash them away.
Anybody ever seen anything like that? Safe to use again or not?
Any input is much appreciated