The serial number tag is located on 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 from the vertical drive should be Positioned on the engine model and serial number https://yamahaoutboardmotorsforsa60123.blogvivi.com/37164305/not-known-details-about-40-hp-outboard-motor-comparison