Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator

Yamaha EF2000iS

Yamaha EF2000iS

Since I love traveling across the country in my RV, I’ve always been looking for a reliable generator to keep my basic appliances up and running. However, I must confess that because I don’t really have that much space in my RV, I was also looking for a generator with a compact and lightweight design so I can move it around according to my passengers’ requirements.

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My search was finally over when I ran across the Yamaha EF2000iS model, a generator that does not only fit in the aforementioned description, but also operates quietly so I can easily take a nap whenever I’m tired without turning it off. In addition, I was also happy to discover that it integrates several fuel economy options, features that I found very useful especially nowadays when the prices of gas are constantly on the rise. Let’s review the features that deem this generator a good investment for RV fans and other type of users.

Features of Yamaha EF2000iS

  • This generator can safely run electronic devices with built-in microcomputers thanks to its Inverter System with PWM control
  • The Auto-decompression system ensures the easy start of the device
  • It weights around 44 pounds, while its compact design makes it easy to transport
  • This model is among the safest gas-fueled generator thanks to the integrated USFS-approved spark arrestor feature
  • The Super-Quiet Muffler ensures a silent operation (it emits around 51.5 dBA)
  • The noiseless operation as well as fuel economy is guaranteed by the Smart Throttle function
  • On the topic of fuel consumption, this is one of the few models that can run for more than 10 hours while in Economy mode
  • The 79cc OHV engines include a cast iron cylinder liner that guarantees an extended lifespan and long-term efficiency
  • The engines of this Yamaha device are powerful and can run at 1,600 watts (although it is rated with a maximum of 2,000 watts)
  • The model incorporates an OilWatch warning system, a feature that does not only ensure the safe running of the generator, but also helps prevent damage to the engine
  • The DC outlet is standard, meaning that the 8amp 12V outlets for charging the batteries will do just fine
  • In the eventuality that you have to account for the power of an entire household, then you can also order the TwinTech capability, a feature that permits you to connect two similar Yamaha generators together for a maximum output of 3,600 watts of power
  • It is CARB compliant
  • The maximum fuel capacity is of 1.11 gallons
  • This generator is covered by two years of warranty


Not surprisingly, most customers who invested in this Yamaha model have been entirely satisfied with the generator and an overwhelming number of users gave it a maximum rating on specialized and other shopping websites. The reason why it has 4.5 out of 5 stars and not the highest rating stems from the shipping issues some customers have experienced. Nonetheless, even those clients have not reported any issues with the Yamaha generator.

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First of all, customers were more than pleased with the fact that this generator is safe to use with sensitive household appliances, such as a laptop, a mobile phone or a tablet. This extraordinary achievement has been made possible by its Inverted System with Pulse Width Modulation control, a mechanism that guarantees a consistent flow of current and stabilized power. Therefore, if you know that you need to use high-tech, sensitive devices during power outages, opt for a reliable inverted generator like this Yamaha model, as otherwise the fluctuations in voltage can ruin your smartphones, laptops, notebooks, so on and so forth.

yamaga generatorCons

Even though some customers have been unhappy with the fact that they received the Yamaha generator without engine oil, it is important to note that this is mostly due to shipping safety policies. Besides, in order to fill the container you will require a quarter of the standard 4 stroke engine oil and, if you follow the instructions provided in the user manual, you will be done filling it up in no time.


Safe, silent and available in an exquisite design, the Yamaha EF2000iS generator is the perfect emergency power source to ensure you don’t have to interrupt your activities in case of a power outage.