Portable Generator

Yamaha EF2000iS Portable Generator Review

March 23, 2020

The Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator is currently ranked as the top portable inverter generator in its class based on customer feedback and owner reviews.

The Yamaha EF2000iS Portable Generator is currently ranked as the top portable inverter generator in its class based on customer feedback and owner reviews. It Delivers up to 2,000 watts of clean Electricity, has Optimal Fuel Efficiency, features a User-Friendly Design, and has a Quiet Operating mode to limit noise. Use it to power drills, table saws, and pretty much anything that draws under 16.7 Amps. And since it’s an inverter, you can use it to power your computers, charge cell phones and other electronic devices, run a TV, DVD player, and more. Let’s take a closer look at some of these key features.

One of the first things that stand out on the Yamaha EF2000iS is just how quiet it is. The noise reduction technology and sound-blocking design means that you will be able to stand just a few feet away from the device and can actually have a normal conversation with someone without having to yell at the top of your lungs. It features a noise-absorbing glass wool construction, a super-quiet muffler and vibration-isolating feet that all help to dampen noise and keep sound to a minimum. You simply wont believe how amazingly quiet this sounds compared to most other models on the market.



The Powerful Inverter System on the Yamaha EF2000iS delivers higher-quality, clean electricity. The electricity generated from this device is actually cleaner and more reliable than most commercial power sources, so you can feel confident using this inverter generator to run your most sensitive devices like TV’s and Computers.

The Yamaha EF2000iS provides excellent fuel efficiency, which it achieves thanks to some key innovative features. For instance, it uses an OHV motor which does a great job at dissipating heat efficiently. It has a dual coil alternator stator to lower the engine speed, and uses a Smart Throttle Load feature which will adjust the engines speed depending on the power that is needed. In economy mode, you should be able to run the device for about 10.5 hours before having to refuel.

Another key feature on this device is how user friendly it is. For starter’s its very light and easy to carry, weighing in at only 44 pounds. The controls are easy to use and all located in one spot, so you wont have to look around the entire unit trying find that button switch went. And one of it’s best features is just how easily it starts. Forget yanking at the cord over and over again. The Yamaha EF2000iS uses an auto-decompression system which reduces compression and will get up started in 1 pull nearly every time. A few other useful features on this model are its very visible fuel gage, a carb fuel shut-off to run the fuel system dry for storage, a carb drain screw and drain tube to drain fuel.

What Our Experts Say

Yamaha EF2000iS Inverter Generator is among those few generators that hold an excellent repute and on genuine good grounds. It is the representation of the preference of those people who look for a very small yet powerful unit to meet small power backup requirement for home or office or outdoor fun activities.

However, one cannot make a decision to purchase just based on its utter popularity. There are other certain factors that need to be evaluated before considering for a serious purchase. Here is detailed assessment to help you learn more about the Yamaha 2000 Generator.

Engine Description and Performance

This Yamaha generator uses a high-quality 4-stroke 79cc OHV engine, which is fixed with a cast iron tube to boost its competence and engine life. It has performed comparatively better than other equivalent inverter genies.

It produces 1,600 running watts and up to 2,000 surge watts. Being an inverter itself and with integrated Yamaha’s Plus Width Modulation control, it produces clean power to run sensitive electronic goods. With its 1,600 rated power it can efficiently work as a small emergency power resource.

It comes with a “Smart Throttle Load” setting that automatically sets the engine pace depending on the required power output and a dual coil alternator stat or that helps in lowering the speed of the engine; making EF2000iS more fuel efficient.

Fuel Type and Run time

This gas-powered unit comes with a small 1.1 gallon tank. However,surprisingly despite of its small tank it gives a run time of 10.5 hours with a 25% load. It is far more fuel efficient than any of its contender.

Start Type and Receptacles

It comes with a recoil pull start mechanism. It starts at the first pull only, making is reliable.

There are two 5-20R outlets and one 12V DC charging point on its control panel.

Sound Level

EF2000iS is well-known for its quiet operation.  Yamaha’s advanced muffler technique used in this model, keeps the noise levels low just like a whisper (ranging from 51.5 dB to 61.5 dB). In fact many people get confused if the generator is running unless they get closer to it. No doubt, that is why it is so preferred for camping out.

Dimension and Transferability

Another fascinating and recommended feature of Yamaha 2000 Generator is its compact built and insignificant weight. With a length of 19.3 inches, width of 11 inches and height of 17.9 inches it occupies merely 2.2 cubic feet space and weighs just 44 pounds within empty tank. Super handy EF2000iS has earned a place in the camping fan arrangements.

Extra Features

Apart from top-notch quality, power-packed engine, fuel efficiency, clean power, soundless operation it has other added features including, fuel gauge, warning at low-oil, spark arrestors, circuit breakers, auto warm-up, ability to connect two generators, voltage selector switch and many more.


However, the first class 3 years product warranty from the manufacturer of EF2000iS is certainly worth to be noticed. This warranty covers the whole generator including the parts and the engineering. Isn’t it brilliant?

Product Price

Despite of the exceptional quality, convenient, and whisper-silent operation there is a single negative aspect that EF2000iS has got; the product value which about $1,000. Generally inverter generators are more expensive than the conventional generators. However Yamaha Inverters are pricey compared with other identical inverters(but affordable than the Honda models).


Features of the Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant):

  • Powerful, with up to 2000 watt maximum AC output.
  • Portable, convenient and easy to use design.
  • Smart throttle adjusts engine speed for a more efficient energy consumption.
  • Innovative Inverter system.
  • CARB approved.
  • High power.The Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant) has a rated 1600 watt AC output and a maximum of 2000 watt AC output that provides you with all your energy needs anywhere.
  • Latest Inverter technology. This portable generator was built using the innovative inverter system that produces sine wave energy which is a high power, finer electricity.
  • Optimum energy efficiency. A low fuel consumption and controllable energy output, the Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant) really pushes generators to the next level. It is installed with a Smart throttle technology that controls the energy output equivalent to the demand of the device attached to it and can run for 10.5 hours continuously without refueling.
  • TwinTech technology. All Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant) units are compatible with each other so you can connect two of them for a greater energy output.
  • Overload breaker. This portable generator also has an electrical overload breaker that prevents generator damage when an overload happens.
  • Ergonomic and easy to use. Designed with an effective centralized control panel, you can access all the features of the Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant) without any difficulties.
  • Portable and convenient. This particular portable generator is the most powerful portable generator that you can use anywhere. It is also capable of charging batteries using its 8A12V DC output which is recommended for boats, autos and RVs.
  • Noise reduction. Constructed with sound proofed glass wool, the Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant) runs without the distracting and irritating noise of some other generators.
  • Warranty. The Yamaha EF2000iS has a two year warranty- you can have it serviced for free within that time frame.

What Do We Think?

It is a great generator for tailgating activities, camping and if case of emergency it can support one or two large appliances even. It is the first choice for those who want to travel with a power resource for all the aforementioned features.  From the perspective of reliability and quality Yamaha EF2000iS Portable Inverter Generator is unmatched. Considering the years of service, and fuel efficiency, even if it is little expensive; it is totally worth it.

What drew me to the Yamaha EF2000iS was the name, Yamaha. This company knows how to design an engine and they put that design know-how into this little 4-stroke, gasoline powered generator. One Amazon reviewer stated, after two years of regular use, “Have had zero problems with this unit so far.” Rated at 1,600 watts with a max output of 2,000 watts, it handles common household appliances, power tools, air compressors, and battery chargers. The front panel controls are labeled well, making it a breeze to operate right out of the box. It is relatively light, portable, fuel efficient, and quiet. It even has a 12 volt DC output to charge batteries without the need for an external battery charger.

The Yamaha EF2000iS is very fuel efficient. It has a one gallon fuel tank, which may seem small, but a full tank of gasoline will run this generator for more than ten hours in economy mode. That means it costs less than 35 cents an hour to operate and lasts long enough to get a good night’s sleep before refueling. Speaking of a good night’s sleep, this generator is extremely quiet. The diesel-powered generators used in the military during field operations are set into holes dug into the ground to suppress the noise they produce. It, in contrast, produces a light hum in economy mode and is only slightly louder at higher output levels. In fact, the noise level is so low that it fades into the background after a while and becomes barely noticeable.

Let’s do a quick summary of the pros and cons of this device


  • Noise reduction technology and sound-blocking design
  • Delivers higher-quality, cleaner electricity then most competing devices
  • Very fuel efficient
  • Very light, weighing only 44 pounds
  • User Friendly Design
  • 2-year manufacturer warranty


  • Engine oil is not included
  • There is no dipstick/oil level indicator

The only real con to the Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant) expressed by some customers is the difficulty in knowing the amount of oil when refilling the generator because the packaging does not include a dipstick or a marked container to determine the right amount to refill.

Our Final Verdict:

The Yamaha EF2000iS is one of the best portable inverter generators you will find. It’s reliable, fuel efficient, quiet, and powerful. You can use to power a wide range of small and large devices, including sensitive electronics. It’s not uncommon to see people using these at tailgate parties to run their 42″ plasma televisions, satellite receivers, small stereos, and more.

The customer reviews we saw for this model were really impressive. Just about everyone was extremely happy with it. We saw a couple of unlucky people who scored a lemon, but that was quickly resolved thanks to the included 2 year warranty. There’s really nothing bad to say about Yamaha EF2000iS except that there is no included dipstick or oil level indicator, which is a minor nuisance. Aside that, this is really the inverter generator to get, as long as it meets your power requirements. If you need more power you can always look into the EF2400IS or Yamaha 3000 models. So would we recommend this model? Absolutely!

Yamaha EF2000iS (Final Points)

This generator puts power where you need it, when you need it. Seasonal power outages are common occurrences. Early spring thunderstorms or winter ice storms play havoc with power lines, but the Yamaha EF2000iS knocks the sting out of these bad situations. Plugging a refrigerator into the unit prevents the loss of perishable and frozen foods. Connecting a rechargeable battery station insures that you have spares ready for a flashlight. In homes that use rechargeable telephones, a loss of power means a loss of telephone service. Use the product to recharge the house phone, or take advantage of the built-in inverter system to charge a cell phone without the worry of fluctuating power levels damaging it. This system is also great for camping. Forget about the ice packed cooler that leaves food submerged in a pool of water after a single day. Keep your food safe and cool in a small, portable refrigerator. Bring along a small television to catch the game, or keep an iPad charged up and ready to check the local weather forecast. Hook up a small air compressor and never worry about trying to find a station to air up your tires. The unit is compact and weighs less than 50 pounds, so it’s easy to set it up where you need it.

There are a few downsides to it, however. The unit does not produce enough power to sustain an air conditioner or a standard microwave oven running at full power. It is designed to allow a second unit to be connected and overcome this limitation, but on its own, it cannot keep up with the power demands of these appliances. Secondly, while there is an oil indicator light that warns of low oil levels, there is no dipstick to measure the oil level. Building a simple dipstick into the cap would help prevent running the unit at low oil levels. Further, the unit smells of gasoline immediately after shutting it down. This can be alleviated, somewhat, by shutting off the fuel supply and allowing it to burn the remaining fuel in the carburetor before shutting down. Finally, the unit requires some mechanical knowledge to keep it working in top condition. Changing spark plugs is something to become familiar with to avoid the cost of sending it to a repair shop for minor maintenance.

This generator is a perfect emergency power source. Its quality craftsmanship, fuel efficiency, quiet operation, and versatility make it a great addition to any home’s emergency management inventory. The Yamaha EF2000iS can bring peace of mind, knowing that if power is needed, this item will fit the bill.

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