The serial number tag is found to the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Found between the thumb screws above the steering tube. This doc has many of Yamaha's worthwhile trademarks. It might also include trademarks belonging to other companies. Any references to other companies or https://outboard-yamaha-motors-fo75699.answerblogs.com/37172038/5-essential-elements-for-outboard-90-hp-for-sale