I have picked up a 15 hp on a new boat I just purchased. The seller said it was a 1983. When looking up the codes, it doesn’t register as a match to anything. The code is J15ELCUD. It does have a 100 to 1 fuel mixture sticker on it’s side but after reading several articles, they suggest that Johnson changed their minds and later recommended a 50 to 1. I have several questions. First is what year is this model? Second is 100 to 1 or 50 to 1. Third is does anyone have a owners manual for this model that they would be willing to sell. Most of my Johnson’s are 70’s models and I can’t seem to find anything about a 1983 (if that is what this actually is) owners manual. Thanks in advance.