Check out this motor,could be for guys with heavy boats or pontoons ?http://www.yanmarmarine.com/News-detail/YANMAR-LAUNCHES-THE-DTORQUE-111-TURBO-DIESEL-OUTBOARD/
I've never known of a 2 stroke outboard "wearing out" and I don't think they do.....but they experience failures due to corrosion or lack of preventive maintenance.....