The serial number tag is found within the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated concerning the thumb screws above the steering tube. By getting into your email deal with you comply with get marketing messages from Yamaha Outboards. You could possibly unsubscribe at any time. https://yamaha-outboard-motors-pa94703.aboutyoublog.com/43343018/about-johnson-175-hp-outboard-motor-parts