Specifications of the Yamaha EF1000 Generator


A generator can be used not only to power your home during a power outage, but also to power tools on a job site where electrical power isn't available. Yamaha, which has been in business since 1955, started making generators in 1998. The Yamaha EF1000 is a brushless AVR (automatic voltage regulator) AC generator.


  • The Yamaha EF1000 generator can generate 1,000 watts and has a maximum output of 850 AC. The maximum AC current can generate 7.1 amps to 8.3 amps at 120 volts.

Engine Configuration

  • The engine of the Yamaha EF1000 is configured as an OHV (overhead valve) and is cooled with forced air. The engine has four strokes with a single cylinder.


  • The length of the Yamaha EF1000 is 15.4 inches, and the width is 11 inches. The generator is 15.3 inches tall and weighs 55 lb. The tank holds 1 gallon. When operated continuously at half-load, the generator can run for 6.3 hours. It comes with a two-year warranty as of October 2010.

Other Details

  • The Yamaha EF1000 features a heavy-duty construction that allows the generator to run for longer periods reliably. The generator features a brushless alternator, which means that it requires less maintenance. It also has an oil watch warning system that turns off the generator when the level of oil is too low; it won't let you run the machine until you add the proper amount of oil. One of the nicest features is the noise-reduction feature, which not only dampens the noise of the generator but reduces the risk of interference from both television and radios.

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