We bought a Troy-bilt portable generator with Briggs & Stratton engine. It is 5000 watt with electric start. The book says it will run 10 hours on 1/2 load - but it doesn't say how to set it on 1/2 load. My neighbor has a different brand of generator and it has a place to set it on 1/2 load. Anybody here familiar with Troy-bilt? Does anyone know of a book with "how to" instructions ... the one that came with this thing assumes the user knows a lot more than we do.