Yes, if you run it at lower amps, the duty cycle increases. Often manufacturers have a kind of chart with duty cycles at 3 outputs, odd that BOC don't. However I just looked up WIA's Weldmatic 175, and it has a 16% duty cycle at 175A, but 100% duty cycle at 67A. Theoretically the BOC should be pretty similar, and since Loui has just bought one, he may be able to find those figures for you on the machine or in the owners manual.
Seems to continue to be strong indicators that BOC are in fact Kemppis, so maybe I will just have to bite the bullet and pick up one of the BOC 250R with remote wire feed that are sitting on Evilbay at the moment.... But my wallet hurts just thinking about that!
all that my new owners manual tell me is duty cycle is 15% @ 175 A
tried the welder tonight and its awesome