Yamaha 25BMH 30HMH Factory Service Manual, Page 18Get this manual
GEN INFO
IDENTIFICATION IDENTIFICATION
SERIAL NUMBER
The outboard motor 's serial number is stamped on label which is attached to the port clamp bracketNOTE: As an antitheft measure, special label on which the outboard motor's serial number is stamped is bonded to the port clamp bracketThe label is specially treated so that peeling it off causes cracks across the serial number1 4