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I disassembled them and used a good spray carb cleaner. Used a wire from a wire brush to clean the holes , Don't use a wire wheel it will scratch the surface and cause this to happen more often !

Mine looked the same after a few miles after clean up also. I am thinking a few miles on the highway will clean them up again. I have been running used transformer oil as fuel , may be a hotter BTU than diesel . The paint left town on the stack after a few highway miles also !!!!