The serial number tag is found about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned in between the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers in the vertical drive really should be located to the engine model and https://outboard-motors-yamaha39382.bloggazzo.com/35805268/fascination-about-yamaha-115hp-2-stroke-outboard