The serial number tag is found about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated in between the thumb screws above the steering tube. OMC Model Number Location The model and serial numbers in the vertical drive should be Found about the engine model and serial https://yamaha-outboard-motors-pa36373.ka-blogs.com/90040392/about-johnson-175-hp-outboard-motor-parts