I always overfill my bikes on purpose , I just like having as much as possible . If it isn't smoking no worries being an external tank too much oil does nothing bad like it can when the oil is stored in the engine itself . There are limits to how much a person should/could overfill though . 1/3 to 1/2 quart to me is common but that's always pushing it, there does need to be room for expansion. Always best to make sure the anti drain valve is working and in good shape.
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