Just purchased this mower which looks and runs pretty good. I think it is an 84 or 85 but the guy really took care of it. Only has a 11 hp Briggs on it which runs well. It doesn't have any hydrostat but uses a system which looks kind of complicated. Just curious as to the good and bad things about this unit. I am also interested in if there is a replacement motor available in case this motor goes. The motor doesn't burn any oil and seems to run OK but I think it is kind of tired.