The serial number tag is found about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated between the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers of your vertical drive should be Positioned about the engine model and serial number https://yamahaoutboardmotorsforsa91841.blogoxo.com/36725216/the-outboard-motor-size-for-boat-diaries