The serial number tag is located to the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated in between the thumb screws above the steering tube. This doc includes many of Yamaha's useful trademarks. It can also have trademarks belonging to other companies. Any references to other companies https://outboard-motors-yamaha-vs86173.mybloglicious.com/56875393/the-best-side-of-outboard-motors-90-hp-for-sale