Briggs and Stratton CO Guard 3500W. 4, 375 Starting Watts. 3, 500 Running Watts. 208 Engine CC. 14 Hour Run Time @ 50% load. This durable, easy starting engine features Overhead Valve (OHV) technology to run cooler and last longer: its ideal for portable generators. A metal 5 gallon fuel tank for more durability and less refueling. 7 never go flat wheel. UPS Delivery.