I'm no expert but...
Was it clearcoated originally?
I understand that most japanese engine cases are made from an alloy of aluminium and something else, that makes it stronger and less prone to heat expansion, so a good product for motors except that it corrodes like crazy and looks shithouse after the first winter.
And that's why they are clearcoated at the factory.
The guy who explained this to me said "It's a painted surface, clean it with detergent then wax it. Same as your tank and side covers"
High miles, engine knock, rusty chrome, worn pegs...
Brakes as new
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