Here's something different; I think. I've used a 6hp 1976 seahorse for perhaps a hundred hours before it seized, due to a gummed piston. Having dismantled it, I discovered the combustion chambers appeared to have been red-leaded. I cannot suppose that this could have been expected to survive in use, although much of it clearly has: neither would I suppose it contributed to efficient cooling. Has anyone come across this practice?
