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.
