ok, just bought my 2003 750 vulcan. while i was looking at it i asked the guy when it needed an oil change, and he told me it had just been changed a couple of weeks before. He then pointed and told me you check the oil level here, and as i looked at it i said it isnt at the full mark, so he grabbed some extra oil he had and filled it to the full mark. i rode my bike about 100 or so miles before i got a manual and discovered that the reservoir he filled was the COOLANT reservoir. my question is, how do i drain that system and clean it out to get rid of the oil residue, then refill?