I got a 205 from a friend ysterday but it's been sitting for a while--outside. He said it's been covered most of the time but every once in a while the wind would blow the cover off. Anyways he let me take it and said to see if it was worth using. The problem is I don't know what to look for or where to look. I spun the shafts on it and it spins pretty smooth and there's no grinding. Do I just pull the big cover on the back and see if there's any water/rust inside?