I see a 1990 250 Bravo in the local paper for sale and I thought about picking it up for my son but would like some insight as to any problem areas these sleds had.I realize that the obvious needs to be scrutinized like the track,chassis,skis and engine,which is stated as running well in the ad,but what about the things like electrical or crank bearings?Should I look for something specific as being a weak spot?