The serial number tag is situated over the SWIVEL BRACKET (port or starboard); or, check the INSTRUCTION PLATE, Situated in between the thumb screws above the steering tube. By coming into your email address you agree to obtain marketing messages from Yamaha Outboards. You might unsubscribe at any time. By https://emilianojhari.madmouseblog.com/17476057/yamaha-250-outboard-top-seal-for-lower-unit-an-overview