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I've answered you in another post, but I will do the same here:
In my 99 FXST (Evolution motor as yours), the oil drains from the oil tank inside a black rubber hose. There is no engine oil plug attached directly in the motor. Just look for one of the hoses that go from under the oil tank and that don't attach to anywhere. At the end of this hose, you'll have remove the metal plug to let the oil to drain. Remember doing this with the warm oil.
Sorry for my english which is not quite good, but I hope you undestand what I say.
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