The serial number tag is found around the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated in between the thumb screws above the steering tube. This doc has many of Yamaha's beneficial trademarks. It can also include trademarks belonging to other companies. Any references to other companies https://yamaha-outboard-motors-pr21620.thenerdsblog.com/42790508/the-basic-principles-of-marine-outboards-for-sale