The serial number tag is situated within the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated in between the thumb screws above the steering tube. This document is made up of many of Yamaha's important trademarks. It might also have trademarks belonging to other companies. Any references https://landeneijjl.blogvivi.com/37584797/the-best-side-of-outboard-motors-90-hp-for-sale