Does anyone here have any experience with Grasshopper lawn mowers? I came across an 89 model with the 61" deck for sale. It has an18hp B&S (V Twin I think). The engine is newer. Runs good, but it surges if the blades are not engaged. Mows good, the sheetmetal and deck all seem to be in great shape, not rusting out or anything. The guy is asking $900 for it, but I don't know a lot about them, or what the potential problems are with them. I am a little leery of one of th drive motors going out, although it seemed to drive just fine. Just thought I'd see what you guys thought of Grasshopper mowers.