The serial number tag is situated within the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned involving the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers with the vertical drive should be located about the engine model and serial number https://yamahaoutboardmotorsforsa75173.onesmablog.com/fascination-about-yamaha-115hp-2-stroke-outboard-77714562