The serial number tag is located on the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated amongst the thumb screws above the steering tube. By getting into your email address you conform to obtain marketing messages from Yamaha Outboards. You could unsubscribe at any time. At PartsVu, https://outboardyamahamotorsforsa21081.blog2freedom.com/36923665/yamaha-150-sho-price-fundamentals-explained