The serial number tag is found over the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned amongst the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers with the vertical drive must be Positioned within the engine model and serial number https://yamaha-outboard-motors-fo94205.bloggazza.com/35812254/5-essential-elements-for-outboard-90-hp-for-sale