2018 Yamaha EX Welcome to Generation EX® - the line of entry-level WaveRunners that delivers endless fun on the water. The EX is affordable and nimble, powered by Yamaha's award-winning, lightweight, 3-cylinder TR-1 engine for fuel-efficient performance. Features may include: POWERPLANT TR-1 four-stroke marine engine. The EX is powered by Yamaha's award-winning TR-1 three-cylinder marine engine that is 40 percent smaller in size, 20 percent lighter in weight and provides better fuel economy than Yamaha's previous four-cylinder Yamaha MR-1 engine. Electronic Fuel Injection (EFI): Delivers a smooth, high power output with low fuel consumption and low exhaust emissions. Specially Designed, One-piece Cylinder and Crankcase Assembly: Provides tremendous engine rigidity that's lighter and stiffer than two-piece designs. Slant Detection Switch: Electronic switch stops engine and oil pumps immediately if watercraft becomes overturned, protecting motor from water ingestion. Dry Sump Lubrication: Uses two engine oil pumps to deliver lubricated oil to each moving part with water-jacketed sump and oil backflow protection. Yamaha Engine Management System (Y.E.M.S.): An integrated, computerized management system that controls and adjusts such functions as ignition timing, fuel injection mapping, engine diagnostics and OTS. The OTS function of Y.E.M.S. activates when the operator releases the throttle lever and attempts to steer the watercraft. This assists the operator in turning while the watercraft is decelerating. Thermostatic and Pressure Controlled Cooling System: Water flow through the engine is controlled by a thermostat and pressure system and is maintained by a pressure control valve. Corrosion Protection System: Sacrificial zinc anodes protect the engine from harmful galvanic corrosion. Stainless steel fasteners (nuts, bolts, hardware) provide a long service life. Electronically Controlled, Variable Ignition Timing: For exact ignition advance control at all throttle positions and RPMs. JET PUMP PROPULSION SYSTEM Cooling Water Intake Filter: Filters out harmful debris that could cause blockage of important cooling water passages. Pumps are Manufactured with YDC30: A combination of zinc and copper alloys, developed by Yamaha marine engineers, that offers excellent corrosion protection. ULTRA-LIGHTWEIGHT, HIGH STRENGTH HULL AND DECK The EX hull is designed to be light and strong. Under the waterline is an all-new hull design that is manufactured to precise tolerances. This lightweight SMC hull delivers excellent stability for one, two or three-up riding and towing, and precise responsiveness and predictability for thrilling one-up riding strong. Progressive, V-Hull with Integrated Bow Spray Guard: Provides excellent maneuverability, handling and comfort. Sponson Design: Provides added straight-line comfort and an improved two and three-up riding experience.