Re: DT85 Impeller and gear case seals.
The two most common places for leaks are the prop shaft seal and the sealing washers for the drain/vent screws. The washers from Suzuki suck(in plain English) and are very soft. Even when tightening down carefully they can tear, at least in my experience with my DT-85. You really should buy a manual if you need to attempt further tear down.