Does anyone know the correct fuel mixture for this trimmer? I have googled it, but have come up with jut about every ratio possible: 16:1, 32:1, 40:1, and 50:1. Which one is it supposed to be? Also, I need to know what spark plug is supposed to be in it. I checked Homelite's website, and they do not have a manual listed for this model. Any help would greatly be appreciated.