General on leisure boats, jet ski propulsion engines: propulsion and jet pumping systems. Boat geometry and hull materials. mechanical and Electrical systems: Tools, Engines disassembly procedure. Engines maintenance check points. Lubrication oil system. Water cooling system. Fuel oil system. Air intake and exhaust systems. Electrical system (DC electric theory and batteries). Auxiliary equipment. Trouble shootings. Deck hardware. Power estimation and sizing outboard engine, boats hull, and propellers.