The serial number tag is located about the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Positioned in between the thumb screws above the steering tube. By moving into your email tackle you agree to acquire marketing messages from Yamaha Outboards. It's possible you'll unsubscribe at any time. https://yamaha-outboard-motors-fo52738.actoblog.com/37682519/the-smart-trick-of-yamaha-150-cc-scooty-that-no-one-is-discussing