The serial number tag is found about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned among the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers of the vertical drive must be Found over the engine model and serial number https://yamaha-outboard-motors-us40616.aioblogs.com/89627414/not-known-details-about-40-hp-outboard-motor-comparison