The serial number tag is found on 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 on the vertical drive need to be Found to the engine model and serial https://ebayoutboardmotorsyamaha99875.topbloghub.com/42832002/5-essential-elements-for-outboard-90-hp-for-sale