The serial number tag is located on the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated amongst the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers of your vertical drive must be located to the engine model and serial number https://yamahaoutboardmotorsforsa01076.tribunablog.com/5-simple-techniques-for-new-25-hp-outboard-for-sale-51240405