Yamaha EF2000iS Review | The Best Inverter Generator?

UPDATED Yamaha EF2000is Review – We decided to take another look at this Yamaha inverter generator and see if the customers are still weighing in with high marks. We even added a little section to the right of Buy Quiet Generators.com – so that it would update daily. As you can see – the Yamaha EF2000is is still this highest ranked portable inverter generator out there.

Added to this Yamaha EF2000IS review are 3 new great videos

1) How to change the oil in the Yamaha EF2000IS Video

2) Complete Yamaha EF2000IS Walk-a-Round From a Real Owner (very good video)

3) How To Connect 2 Yamaha EF2000is Generators Together

Yamaha EF2000IS Review - Still On Top With Real Customers

The Yamaha EF2000IS Still Holding True With Real Customers

Over and over again, the Yamaha EF2000is continues to impress those who have bought it. If you look at the Generator Comparison chart you will see it is also the most quiet generator out there – 51.5 dB is the lowest and they have it. As some have said, you get what you pay for.

A Few Yamaha EF2000IS Considerations

As of the time of this post (which was originally back in January 2011), the Yamaha EF2000iS 2,000 watt portable inverter generator is leading the way with excellent reviews from those who have purchased it and used it. It is a very quiet inverter generator that can be used for camping, RVing, tailgating, fishing outings or any other outdoor pursuit. Of course it would make a great back up generator in those times of power outages, storms, you name it.

One consideration to look at is the fact that it does NOT come with oil, an oil spout, gas can or generator power cord. This Yamaha EF2000iS review can say it does come with the cord that will allow you to charge batteries: 12v output designed for charging vehicle or boat batteries DC outlet – (cables included)

Another possible drawback for some folks will be the price. It is definitely more expensive than comparable models – yet this doesn’t seem to deter those looking for quality and quietness in their generator. I would say do NOT pay more than $1,089.10 (as of this writing) I have seen it selling for over $1,300.00 and there is certainly no reason to pay those amounts. Read this full Yamaha EF2000is review and watch the included video(s) for more information.

How To Change The Oil In Your Yamaha EF2000IS Generator

Full Yamaha EF2000IS Review Video By A Real Owner

How To Connect 2 Yamaha EF2000is Generators Together

Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator, CARB Compliant, Blue
Overall Rating:
Total Customer Reviews: (290)
List Price: $1,099.00
Sale Price: $914.15
Availability: Usually ships in 1-2 business days



Amazon.com Price: $914.15 (as of 2015-02-10 19:54:47 GMT)
Product prices and availability are accurate as of the date/time indicated and are
subject to change. Any price and availability information displayed on Amazon.com at
the time of purchase will apply to the purchase of this product.

Product Description

Powerful, portable, and efficient, the Yamaha EF2000iS Gas-Powered Portable Inverter delivers maximum electrical output without sacrificing portability. Thanks to its innovative inverter system, the generator is able to generate up to 2,000 watts of clean AC power. It can run up to 10.5 hours continuously without refueling and uses premium technologies to maximize fuel efficiency.

EF2000iS Inverter
At a Glance
  • Combines powerful output with portability
  • Inverter system allows you to power delicate machinery
  • Fuel-efficient; can run for 12 hours without refueling
  • Lightweight and easy to carry
  • Backed by a 2-year warranty


Compact and ergonomic, the EF2000iS is easy to store and transport. View larger.


TwinTech technology allows you to hook up two units for added output. View larger.

Powerful Inverter System Delivers Cleaner Electricity
The EF2000iS is built around an innovative inverter system, which is able to deliver higher-quality, cleaner electricity than competing generators. It produces energy in the form of pure sine waves, which are cleaner and more reliable than most commercial power sources.

In simpler terms, this means that you’ll be able to confidently power delicate machinery without having to worry about the damage caused by unrefined energy. An electrical overload breaker is also included, to prevent generator damage in case of an unexpected overload.

Smart Technologies for Optimal Fuel Efficiency
The EF2000iS is exceptionally fuel efficient, able to run for up to 10.5 hours without refueling when in Economy mode. Its OHV engine runs reliably and dissipates heat efficiently, allowing for both a long life and optimal fuel consumption.

With its Smart Throttle Load feature, the generator is able to dynamically adjust engine speed depending on output, resulting in greater overall fuel efficiency. The generator also features an exclusive dual coil alternator stator, which lowers engine speed and reduces total fuel consumption.

Ergonomic, User-Friendly Design
Weighing 44 pounds, the generator is ultra-portable and features an easy-to-carry design. It has a convenient, centralized control panel, which allows you to easily access all of the generator’s features at the push of a button. It also starts up responsively due to its auto-decompression system, which reduces compression and makes start-up less difficult.

For added convenience, the EF2000iS is able to recharge batteries with its 8A12V DC output, making it ideal for RV, auto, and boat owners. You can even hook up two EF2000iS units for added output, thanks to TwinTech technology. And you won’t have to worry about engine damage due to low oil levels: an oil-watch warning system constantly monitors oil levels and lets you know when an oil change is needed.

Noise Reduction for Quiet Operation
The EF2000iS uses noise reduction technologies to ensure the quietest operation possible. Featuring a special sound-blocking design, the generator has noise-absorbing glass wool construction, which helps dampen noise even during heavy operation. Along with the EF2000iS’ super-quiet muffler and vibration-isolating feet, it helps keep noise to a minimum.

The EF2000iS is backed by a two-year warranty.

What’s in the Box
Gas-powered generator



Environmentally friendly, the EF2000iS has the EPA’s longest engine emission life rating. View larger.


The EF2000iS recharges 12-volt batteries, making it ideal for boat, RV, and auto owners. View larger.


Product Details

  • 1600 watt rated AC output, 2000 watt maximum AC output, 13.3/16.7 amps @ 120V
  • Super-quiet muffler with USFS-approved spark arrestor – 51.5 dBA at 1/4 load
  • Smart Throttle varies engine speed based on load – improves fuel economy and reduces noise
  • Inverter system with Pulse Width Modulation (PWM) control
  • CARB Compliant

Price Comparison


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