The serial number tag is situated over the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned amongst the thumb screws above the steering tube. By getting into your email deal with you agree to receive marketing messages from Yamaha Outboards. You could unsubscribe at any time. At https://yamaha-outboard-motors-fo63891.ageeksblog.com/35609418/yamaha-150-sho-price-fundamentals-explained