The serial number tag is located on the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned among the thumb screws above the steering tube. Fortunately, PartsVu has a prosperity of resources to help you find the Mercury outboard parts you need to maintain your engine running efficiently, https://yamaha-outboard-motors-ne18405.bloggin-ads.com/59951995/the-smart-trick-of-yamaha-150-cc-scooty-that-no-one-is-discussing