Engine Repairs & Maintenance 100 Hour service Change engine oil & filter Change fuel/water separator Engine cleaning & corrosion treatment 200 Hour service Includes 100 hour service Replace spark plugs & thermostats Service water pump & change lower unit gear oil Re-grease all moving components Replace all zincs (engine, gear case, trim/tilt unit) Mechanical & electrical fixes Small Fiberglass Repairs Cosmetic cracks Transoms & decks