Unique in its category: 40hp 4-stroke 16 valve. It is a powerful, agile and gritty engine with electronic injection. Thanks to its advanced technology. you can ask this engine much more than its 40hp on paper, it is a Yamaha best seller. It uses EFI technology and adjustable idle speed and is compatible with Yamaha digital instrumentation, plus it features an oil vapor recovery system and Yamaha’s Ideal Anti-corrosion Protection (YDC-30). Maximum fun, minimum emissions.