Yamaha EF2000iSv2 Generator Review

Yamaha inverter generators have been a reliable and trusted brand of generators for a long time and their products never disappoint.  The Yamaha EF2000iSv2 Gas Powered Portable Generator is one of the most quiet inverter generators, besides it being smaller than other generators. It also offers wide range of applications than most generators. It is portable, has longer running time and you can power more devices!

The Yamaha EF2000iSv2 Gas Powered Portable Generator improved the controller and added advanced programming to accommodate more devices but making sure it is still fuel efficient. The Smart Throttle will control the engine speed and will tell you the load needed to let you save fuel continuously.

Yamaha EF2000iS Generator Front


Quick Overview

We have a short video about the Yamaha EF2000iSv2 where we give you the most important information you need to know before you buy.

Learn more about the Yamaha EF2000iSv2 generator

Want to learn more about the generator before you decide? Then keep reading and we will tell you more about it.


Power Output/ Engine & Fuel

A high quality 79 cc 4-stroke overhead valve engine is being used by Yamaha EF2000iSv2. It has a cast iron cylinder to prolong and improve the engine and the life. Yamaha’s Pulse Width Modulation (PWM) control is installed on this inverter generator, it provides one of the best sine wave to run the any gadget or appliances.

Yamaha EF2000iS Generator Control Panel

Yamaha EF2000iSv2 has 1,600 running watts, which means it may not be the best emergency power source but it can power a few number of appliances. This 45-pound inverter generator is quite lighter than the average generator weight. Because of its fuel efficiency, though it has only a 1.1 gallon gas tank, it can run for almost 11 hours with 25% load only without refueling.


Noise Level

For the built-in outlets, there are two (2) alternating current or AC Outlets which is the most commonly needed to charge appliances, and has a direct current or a DC Outlet to charge batteries, too. Yamaha inverter generators are known to have the quietest system, like this EF2000iSv2 has only 51.5 dB to 61 dB. You won’t hear the generator is running until you are really close to it.



This Yamaha EF2000iSv2 is one of the lightest and most compact generators ever! It weighs approximately 45 pounds and measures only 2.2 cubic ft. You can take this inverter generator anywhere and carry it during camping, or for emergency cases.


What’s in the Box?

  • Yamaha EF2000iSv2
  • Instruction manual
  • DC Battery Charging Cord

Does not contain oil, basic tools and funnel.

Warranty: Limited two-year warranty that covers the defects in parts, and services for three (3) years.

Maintenance recommended for Yamaha EF2000iSv2

Spark plug – should be cleaned or replace every 6 months or 100 hours used
Engine oil -should be cleaned or replace every 6 months or 100 hours used
Air filter –should be cleaned or replace every 6 months or 100 hours used
Muffler screen -should be cleaned or replace every 6 months or 100 hours used
Spark arrester -should be cleaned or replace every 6 months or 100 hours used
Fuel filter -should be cleaned or replace every 6 months or 100 hours used
Crankcase breather hose -should be cleaned or replace every 12 months or 300 hours used


Price/Customer Reviews

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Customer reviews from Amazon.com are just amazing! There are over 413 reviews on Amazon.com, which 77% of them awarded this unit 5 Stars.  Overall, Amazon loyal buyers have rated this incredible Inverter generator a total of 4.3 out of 5 Stars!

Before buying anything, always apply the needs versus wants balance so you .  Just be sure you know your power needs.  If the features and price combination match for you, you can’t go wrong.  The fact that it remains a bestseller over the years shows that consumers are happy with this generator and are not afraid to tell others.  Not only does it sell well, but the many users who don’t mind shelling out a good chunk of change for another one to use in tandem tells you something.

Users love the dependability and ease of use.  Many reviews praised the generator as exceeding their expectations

I can confirm that the Yamaha EF2000iS is all that it’s cracked up to be.  The defect rate is VERY low.  It compares nicely to the gold standard.  The similarly sized Honda inverter portable generator.  If you want the features that this generator has, you will be happy with this one.  For mid to small needs, this works fine.  Remember it is upgradable by hooking up a second unit with the connection cord (separate purchase).

Hooking two of these up will give you the ability to provide for most of your home’s power needs in an emergency to power multiple devices during a power outage, but I don’t recommend this.  And they can of course be disconnected and used separately.

Customers who have purchased the Yamaha EF2000iSv2 Generator say this machine holds up to the quality of its name. They love the fuel gauge on this unit so they are sure not to run out of fuel when its needed. It is a quiet machine that is a real bonus, especially when using in camp grounds, and appreciate how portable this model is and how easy it is to store.

Another customer who purchased the Yamaha EF2000iSv2 Generator says it a little gem and couldn’t be happier with the power of this machine. It’s easy to start, runs great, and has been a life saver during their last power outage. This model was able to keep their furnace running, lights on, and made it possible to continue watching their favorite programs. They recommend this unit to everyone.

There are 411 reviews on Amazon, and the majority of them give this model a 5 Star review.

significantly less noisy, (2) significantly more fuel efficient, (3) significantly more convenient because of it small size and low weight


Pros & Cons

To be honest, there’s no real accessories which come included with Yamaha ef2000isv2. But with that being said, you don’t really need any accessories either as it’s simply a matter of fueling the unit, plugging in your appliance which requires power, and away you go!


  • Super quiet!
  • Good fuel efficiency
  • Prooved Reliability
  • Lightweight & compact


  • Expensive!
  • Only 2000W Power Output

Additional Features

Yamaha EF2000iS Generatorfuel gauge
gasoline petcock
voltage selector switch
parallel function – connect two generators together to double power
low oil warning system
EPA & CARB-approved
spark arrestor
smart throttle (automatic throttle adjustment)
auto warm up – boosts engine speed during cold start
auto decompression for quick starting
overload circuit breakers
DC 8A/12V charging outlet
3 year warranty (on entire generator for defects in parts & workmanship)



This is yet another big benefit from this Yamaha generator. An economy control switch helps regulate the engine speed as per the connected load. This means that energy is used depending on how the electronic device being powered requires it. The results are a more efficient fuel consumption method and less noise. Usually, generators produce more noise depending on the size of the load being powered, but if the system is as efficient as in this generator, then your kitchen or camp remains quiet throughout the time the generator is on. Remember however that you shouldn’t put this switch on when powering equipment that requires higher starting watt requirements.

With auto warm up during startup at 2000 watts to be safe from big loads. The good thing about this unit’s inverter feature is it only produces safe, clean and reliable power that is refined. So even your small electronic gadgets that have high sensitivity to currents like cellphones, plasma TVs and laptops, these will be safe from surge damages.

This inverter generator is packed with an air-cooled OHV 79cc, four-stroke, single-cylinder engine. It is capable of producing 1600 watts up to 2000 watts. Due to its capacity to adjust to varying load, it can protect itself from surges when powering large appliances.

And because of its inverter system with Pulse Width Modulation (PWM) control, any electrical or electrical devices that you connect to it can be safe. With its smart throttle, there’s no possibility of overloading, current fluctuation or producing varying degrees of frequencies.

When it comes to safety features, the Yamaha EF2000iSv2 portable inverter generator has a lot.

It has an oil watch warning system that will tell you when it is low on oil. Insufficient oil may cause damage to the engine if not properly sustained. However, if the oil gets too low with this generator, it will automatically shuts down its engine. With other brands, this is non-existent thus causing owners a lot of money on repairs.

It also has an electrical overload protection system so if there’s an overload due to too many appliances sucking up current, its circuit breaker will automatically trip off to prevent damage to generator’s engines and components. It also has an auto-decompression system that eliminates compression but enhances easy startup.

Moreover, this unit is also EPA and CARB (California Air Resources Board) emission certified. This means that since EPA approved this for its clean emission, it is safe to use on all 50 US states. And with California having a unique emission standard, the EF2000iSv2 also passes CARB’s air quality emission test.


Proper Disposal of Oils/Gasoline

This may not directly have to do with how awesome this generator is, but it is a very important factor of using any oil/gas powered generator, that needs to be talked about more often.

After running generators or doing something that involves an oil of some sort, like changing your car’s oil, most people tend to just go back inside and pour the remaining oil down the drain, into the sewer. just throw it to the ground, or into a body of water. This is hugely harmful to the environment and is not the correct way to dispose of any oil or gasoline, not to mention it is illegal. You can be charged a fine or criminal penalty of some kind for disposing of it this way.

As long as your leftover gasoline is in good condition and is not for a two-stroke cycle engine, it can be poured into the fuel tank of a gasoline-powered truck or car. If the gasoline has deteriorated or has been polluted in some way, look up your local fire department, recycling center, or hazardous waste disposal center to ask them how to dispose of it or have them dispose of it for you. This may cost a fee, but it is well worth it to protect the earth we call home and not get any tickets or fines.

Last, but definitely not the least, potentially getting burned is, of course, a possible risk involved in the operation of any generator. Anytime the WEN generator is in use, there is heat being produced from the combustion of the fuel. Fortunately, WEN put safety labels all around their generator on the spots most apt to gain heat. Be mindful of these labels and do not touch near these areas on the generator or you will get SEVERELY burned.

I hate to have to insult your intelligence by saying this, but I feel it should be said. Only qualified, adult people, who are experienced in the use of generators should operate them. Children should never be left unsupervised with one and they should be taught all of the dangers associated with the touching, moving, and powering of said generator.

Used motor oil can cause skin irritations if left in long-tern contact with skin. Wash hands thoroughly with soap and water after handling oil. Do not dispose of used oil in drains or on soil. Local service shops provide environmentally-friendly disposal methods.

Stop the engine and remove oil filler cap.
Place a pan under the engine.
Remove the oil drain screw and allow the oil to completely drain into the pan.
Reinstall drain screw before filling the engine with fresh oil. Do not overfill oil reservoir. Use a funnel to prevent spillage.
Reinstall the oil filler cap and tightly fasten
Draining the Carburetor

Turn OFF the engine. Let Cool. Turn the fuel valve ON.
Position a container under the carburetor drain screw. Loosen the drain screw.
Allow fuel to drain completely drain and re-tighten the drain screw.


In our view, if you want a generator that you can use for camping or other recreational uses and, perhaps, support one or two larger appliances when emergency power is needed, the EF2000iS is one of the best and most reliable inverter generators you can buy. In particular, its fuel efficiency, quiet operation, and incredibly light weight make it a superior choice for those looking to travel with their power source. Moreover, from a quality and reliability standpoint too, Yamaha inverters are considered second to none, with the closest competitor being Honda.

Nevertheless, we would definitely not consider this a good emergency power source for most people. if you are buying a generator mostly for backup power to keep you going through outages, then most people with either need a much bigger Yamaha inverter, or a conventional generator that will deliver a lot more raw power for greedy appliances like sumps, fridges AC units, heaters, etc.

Finally, even though the EF2000iS is very expensive compared to virtually all other generators, save the Honda models, we’d still consider it a good buy if you can afford it. The reason is that the EF2000iS is just so well-built and reliable – when you consider the many years of service it can provide, it’s definitely worth the relatively higher price tag in our view.

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