Yamaha Outboard Motors Factory Service Manual F6 and F8, Page 22Get this manual
IDENTIFICATION IDENTIFICATION SERIAL NUMBER
The outboard motor's serial number is stamped on label which is attached to the port clamp bracket
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