Useful Links

Amazon.com: DuroMax XP4400E 4400 Watt 7.0 HP OHV 4-Cycle Gas …
The XP4400 Features:? Durable DuroMax 7.0 Hp, air cooled OHV engine with low oil shutoff .? Heavy duty steel frame with four point fully isolated motor …
http://www.amazon.com/DuroMax-XP4400E-Portable-Generator-Electric/dp/B001BMDFPS

Engine-generator
An engine-generator is the combination of an electrical generator and an engine (prime mover) mounted together to form a single piece of equipment.
http://en.wikipedia.org/wiki/Engine-generator