Those spots look like baked on dirt to me. Can be quite hard but it should come off. Try soak them with CRC or similar solvent and use hard bristle brush (not wire brush) then a chrome polishing compound.
The spark plug looks ok to me, given it is such a grainy photo. If all your fluid levels are ok, your bike is definitely not the source of the oil smell.
The spark plug looks ok to me, given it is such a grainy photo. If all your fluid levels are ok, your bike is definitely not the source of the oil smell.