Yamaha’s premium YG4000D from its industrial line comes equipped with 2007 with a combustion chamber to increase output to 4000 watts. This brushless AC generator is ready to satisfy your mid level power requirements with ease, while maintaining convenience, and offering several noteworthy features.

The YG4000D is powered by a massive 251 cc 8.5 hp OHV engine. It has an AC output of 4000W max and 3500W rated. This model can operate on both 120V and 240V. At 69 dB, it is not very loud and should not be an annoyance.

This model comes well equipped to add convenience and increase productivity. The auto decompression feature combined with the transistor controlled ignition makes starting the YG4000D easy. The economy control enables continuous operation for up to 10.6 hours, which is fairly efficient on its 4.8 gallon tank. The brushless alternator is extremely durable and requires little maintenance. Its noise suppressor improves performance around electronics by eliminating interferences. It is definitely heavy at 132.3 pounds, yet the lifting eye system is very helpful during transport. In all, this is a durable and convenient source of power for running tools, saws, lights, fans, refrigerators, and a variety of other applications on the job site.

Specifics cited from:

http://www.yamaha-motor.com/outdoor/products/modelhome/456/0/home.aspx