The Yamaha EF2000iS Generator

Quiet, Efficient, Powerful, Portable

The Yamaha EF2000iS Generator

The Yamaha EF2000iS generator is a light-weight, gas-powered portable generator, providing substantial electrical output while retaining easy portability. Thanks to its advanced muffler system, it is one of the quietest units on the market, and fuel-saving technologies allow it to run up to 10 and a half hours on a single tank of gas. Because it is an inverter, the AC power produced is extremely clean so it can be used to safely run today's delicate electronic devices like computers and TVs, unlike standard generators.

Exceptionally Quiet and Fuel-Efficient

One of the most striking features of the Yamaha EF2000iS is how quiet it is. It is so quiet that you can actually have a normal conversation with the generator running nearby. The EF2000iS is rated at just 51.5 decibels (dBA) atThe Yamaha EF2000iS generator a 25% load and only 61 dBA under full load. For reference, a standard electric razor is rated at 68 dBA! (Source: Acoustical Solutions).
This is achieved by using a number of noise reduction technologies to ensure the quietest operation possible. These include a sophisticated sound-blocking design, noise-absorbing glass wool construction, Yamaha’s most technologically sophisticated muffler and vibration-isolating feet, all of which help keep noise levels down even when the unit is under a heavy load.
The EF2000iS is also exceptionally fuel efficient – in economy mode, it can run continuously for up to 10.5 hours on a single tank of fuel. And with Yamaha’s Smart Throttle Load feature, the generator automatically adjusts the engine speed to match the load, resulting in both less noise and greater overall fuel efficiency.

Easy to Start, Run and Maintain

The EF2000iS employs an auto-decompression system, which reduces compression and makes start-up easier. It also boasts an auto-warm-up function. This increases engine speed during cold starts, producing the power that high-demand appliances need without waiting.

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It has a convenient, centralized control panel, which allows you to easily access all of the generator's features. The fuel gauge allows fuel level to be seen at a glance, while Yamaha’s Oil Watch Warning System constantly monitors oil levels and indicates when an oil change is needed. This helps avoid damage to the engine that can result from low oil levels, and lead to costly repairs. The OHV engine comes with a steel camshaft and valve train components, and a cast iron cylinder liner for efficiency, reliability and durability.


Check out the Yamaha EF2000iS

Check out the video below to see the EF2000iS in action.


Powerful Inverter System Delivers Cleaner Electricity

The Yamaha EF2000iS generator uses an innovative inverter system with Pulse Width Modulation (PWM) (see Generator or Inverter?). This means that the power output by this unit is in the form of pure sine waves, cleaner than even many commercial sources of electricity, and far superior to standard-alternator generators. What this means is that the power provided by the EF2000iS is suitable for today’s delicate electronic devices that rely on microchip circuitry, such as computers, TVs, and many appliances and tools.
The unit also features an electrical overload breaker which will prevent damage to the generator should an unexpected overload occur.

Flexible Power Output Possibilities

Out of the box, the EF2000iS is rated for 1600 watts (max. 2000 watts) and 13.3 amps (max. 16.7 amps) @ 120V AC. In addition, the unit can output 8A/12V DC with the included cables, ideal for charging car, RV and boat batteries.
But that’s not all – using Yamaha's TwinTech™ technology you can connect two units for 3600 watts, 30 amps of maximum power (requires the TwinTech accessory cable available at extra cost).

Easy to Transport, Store and Service

With an extra-large comfort-grip handle, the Yamaha EF2000iS is light-weight (it weighs a mere 44 pounds) and compact (just 2.2 cubic feet) which makes it unusually easy to transport and store. It has a fuel petcock that lets you shut off the gas supply to run the carburetor dry when you plan to store it for a while, and helps prevent stale gas problems. The side panels are easily detachable for quick and easy servicing.

Environmentally Friendly – EPA and CARB Compliant

Many generators can’t be sold in California because they don’t meet the stringent emissions requirements of the California Air Resources Board (CARB). Yamaha EF2000iS generators have the longest emission engine durability ratings issued by the Environmental Protection Agency (EPA) and the California Air Resources Board and meets even strict EPA and CARB standards for low emissions.


Generator Type Inverter
Maximum AC Output 2000 watts
Rated AC Output 1600 watts
Rated / Maximum AC Current 13.3 / 16.7 amps @ 120V
Engine OHV, air-cooled, single cylinder, 4-stroke
Displacement 79cc
Overall Length 19.3 in
Overall Width 11.0 in
Overall Height 17.9 in
Dry Weight 44.1 lb
Fuel Tank Capacity 1.1 gallons
Continuous Operation at
1/4 Rated Load
10.5 hrs
Noise Level 51.5 -61 dBA
Warranty 3 Years Limited Warranty
MSRP $1,099

3-year Guarantee

Yamaha guarantees the entire generator against defects in parts and workmanship for three (3) years.