This Id try the 5 but it seems to me that mine was more like a 4 - memory fails at this the alternator will drag down the engine speed, but if you are over geared, it will REALLY do it! -580 sing parts easily available from the internet see helpful links and your local stores, you can make a small solar power generator for 250 to 300. Great for rolling blackouts, life outside the power grid, or the coming zombie apocalypse. Power your computer, modem, dvd, tv, cameras, lights, fans, or DC appliances anywhere you go. Use in cabins, boats, tents, archaeological digs, or while travelling throughout the third world. Have one in the office store room in case of power failures in your highrise. I keep mine in my bedroom where it powers my music, lights, dvd player, laptop, and ahem a back massager. I run a line out the window to an 8 x 24 panel on the roof. This is the smallest simplist set-up practical for daily use. It saves me about five dollars a month off my electric bill. It also saves the environment. Do you know that most of the electricity coming out of your wall socket is generated by coal? All of the parts you need can be bought from "freedom tower windmills " and "generating electricity fossil fuels " (include "build your own wind chimes", "how solar power works for kids ", "allegheny power bill payment ", "how does wind power produce electricity ", "3kw solar power system price ", "Daily show wind power ", Hydro Green Energy, LLC (HGE) is a privately-held renewable energy development company with proprietary hydropower technology. & Home energy use chart )