I've got a Mercury 5hp auxiliary engine (quite recent, about 2yrs old) and i want to add it to my insurance policy. But when I went to look for the serial number last night, I couldn't find it!
I looked on the engine and gear casings, saddle clamp, no luck. All that I could see was a paper bar code on the side of the saddle clamp which had worn off. And a number stamped on the carburettor.