The serial number tag is situated around the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned between the thumb screws above the steering tube. By coming into your email deal with you agree to get marketing messages from Yamaha Outboards. You could possibly unsubscribe at any time. https://connerdrydg.theobloggers.com/42850436/about-johnson-175-hp-outboard-motor-parts