Firman Generators PRE4000K Gas Powered Portable Generator with Kohler Engine and Wheel Kit Powered by Kohler engines 7hp 208 cc Kohler engine 4 gallon steel fuel tank extends running times; makes refueling easier than ever before Noise reduction muffler for a quiet operation Heavy duty flat free tires stay portable with large flat-free wheels that can handle rougher terrains Low oil pressure in the event oil pressure runs low; the engine will automatically shut down