check first that the oil in the gear housing is O.K., simply crack the lower screw and let a little out. It should be light to medium brown in color, and at least translucent.. Lighter, opaque and creamy colored indicates water intrusion. Inky black & burnt odor..it's past due for a change. 100 % water, Bubbly grey-black, metallic colors, bad odors indicate serious problems. Unsure? Contact San Diego Yacht Works! At any rate, change the oil every 50 running hours using a high quality lube such as Evinrude-Johnson Ultra HPF or Mercury Premium Gear Lube and you shouldn't have any problems. Cooling system and water-pump problems can be alleviated by replacing the pump every so often. Impellers take a set when unused and can shed vanes fast when you operate the outboard after an extended period of storage. I advise that ANY motor which has been idle for more than 1 year have a VISUAL check of the pump. It's real easy to install a new impeller and avoid extensive engine damage caused by an overheat. Call San Diego Yacht Works now for free consultation and the best program for your Unit.