Yamaha EF2000iSv2 – Best Gas Powered Portable Generator Review

If you plan to invest in a generator, you obviously want a quality unit that is reliable and dependable. That is exactly what you will get from the Yamaha EF2000iSv2. The Yamaha name is synonymous with quality and they make equipment that works hard and lasts long.

In our Yamaha EF2000iSv2 review, we will take you through the key features and benefits of this remarkable compact generator. This will illustrate the value it offers. We will also look at a few other good options to see how the Yamaha model compares.

We chose to focus on the Yamaha EF2000iSv2 after extensive research. After careful consideration, we looked closely at the features, build quality, reliability, and performance of this particular model. We read a vast amount of feedback from consumers that have bought and used this generator in order to bring you factual and unbiased information. Needless to say, we were impressed with all of this information.

The Yamaha EF2000iSv2 is a compact and lightweight generator that has many advantages. It is a gasoline generator that uses inverter technology for safe, quiet and efficient power.

Let’s take a closer look at what makes the Yamaha EF2000iSv2 a leading choice.

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Generator typeInverter
Fuel Type Gasoline
Surge/peak watts2,000
Running watts1,600
Parallel readyYes
AC voltage120V
Engine79cc, OHV, air-cooled, single-cylinder, 4-stroke
Starting methodRecoil
Fuel tank capacity1.1 gal
Run timeat 25% rated load 10.5 hours
Noise level51.5 – 61 dBA (at 25% load)
Dimensions19.3 x 11.0 x 17.9 inches
Weight44.1 pounds
Outlets2 x 120V AC outlets, 1 x DC Outlet (8A 12V)
Warranty3 years limited warranty

What’s in the box?

Included with the kit, you will get the following:

  • 1 x Yamaha EF2000iSv2 Inverter Generator
  • 1 x DC battery charging cables
  • 1 x Spark plug wrench
  • Owner’s Manual
  • Quick-Start Guide

What you do not get is oil. While many manufacturers include this, Yamaha does not. Don’t skimp on the oil and do get a decent quality. About a ½ quart is needed. There are a number of oils to choose from but the Yamalube 10W-30 Oil PERFORMANCE ALL is one that comes highly recommended. You will also need a funnel and obviously, you will need gas.

Additional accessories

Although the generator comes with everything you need, with the exception of oil, there are many accessories that can improve your generator experience or give you added protection.

These include a tachometer/hour meter to track the hours the generator has been used and allow you to keep an eye in the RPMs, a protective all-weather cover and a wide range of extensions and cables for added versatility and convenience.


As one would expect from Yamaha, this is a feature-rich generator.

Size and weight

Size-wise, the generator is an impressively compact design and the dimensions are 19.3 x 11.0 x 17.9 inches. It weighs a mere 44.1 pounds which is light for the power it delivers. This makes it light and easy to move and use in many environments.

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This light and compact unit delivers a starting power of 2000 watts and running power of 1600 watts. It does this safely and with ease. Given the compact design this is a good amount of power that will be handy in a range of environments.

The rated and maximum AC current is 13.3 and 16.7 amps respectively and it is a 120V generator.

Inverter technology

This is an inverter generator that makes it extremely fuel efficient and quieter than non-inverter generators. It also makes it perfectly safe to use to charge or power electronic devices.

Engine quality

Power is generated by a reliable and dependable Yamaha single-cylinder, 4-stroke 79cc OHV, air-cooled engine.

The engine is the expected Yamaha quality with a steel camshaft, steel valve train components and a tough cast iron cylinder liner. This makes it durable and reliable. You will get many years of use out of the generator with minimal hassle and fuss.

Starting mechanism

It has an efficient recoil start which, although not as easy as an electric start, is reliable and effective. Most people reported the generator starts with minimal effort.

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Parallel ready

If you need more power at times, it is parallel ready and connecting an additional generator is quick and easy. You will need the Twin Tech Cable  but this will double your power output instantly.

Fuel tank capacity and runtime

It has a 1.1 Gallon fuel tank and combined with the inverter technology delivers around 10.5 hours runtime on a ¼ load. Once again, given the light and compact design, these figures are impressive.

Noise levels

The design and inverter technology help to keep noise levels low and the Yamaha EF2000iSv2 runs at 51.5 dBA to 61 dBA operating at a ¼ load. This is relatively quiet and should not disturb those around you. You can use it without fear of disturbing neighbors or those around you.

Safety features

Yamaha always has a strong focus on safety and the EF2000iSv2 is no exception. First off, the generator uses inverter technology with PMW or Pulse Width Modulation. This makes the power clean and stable so it is perfectly safe to use on all sensitive electronic devices. You can conveniently charge laptops, cell phones, tablets, GPS devices, cameras, and other equipment.

Oil watch warning system

The system will alert you when the oil is low for added engine protection. When oil levels drop too low the engine will automatically shut off. It also features an electrical overload breaker to prevent you from damaging the engine.

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Spark arrestor

Another handy feature is the enhanced muffler with USFS-approved spark arrestor. This makes it safer to operate while also reducing noise significantly. Good ventilation ensures effective heat dissipation.

Safety certification

These features have ensured that the EF2000iSv2 is CSA, EPA, CARB certified. This will give you the freedom and peace of mind to use the generator confidently in most environments.

Control panel

The control panel is basic but easy to access and extremely user-friendly. There is a fuel gauge that is easy to see and will let you know at a glance how much fuel is remaining.

Controls and outlets are well laid out and practical. In terms of outlets, you will get two three-pronged 120-volt AC outlets and a 12-volt DC. The latter is an 8A 12V outlet and is ideal for battery charging. The cables are included in the kit. That should give you freedom and flexibility for a wide range of applications.

Build quality

The build is solid enough for a small generator. The model is made of durable plastic. This keeps the weight down and is resilient to bumps and scrapes. It does not have wheels but at only 44.1 pounds they are entirely unnecessary. It does, however, have a sturdy handle on top to make it even easier to move from place to place. There is no doubt that this is a highly portable generator.

Brand quality

One of the great things about dealing with a reputable brand such as Yamaha is the great aftersales service and support. They have a wide network and service should not be an issue. This model has a good 3-year warranty. That should give you peace of mind. Yamaha products are built to last so you will get a great deal of value out of your investment.


The Yamaha EF2000iSv2 has been built for convenience and ease of use. It is extremely user-friendly and operating it is a breeze. Little to no maintenance is needed and anyone can operate the generator safely. Oil is the main thing you will need to keep an eye on but it will warn you when this is necessary so you have no need to check it all the time.

As it is designed to be a portable generator there is no need for any installation. It is pretty much plug and play. Set it up on a flat dry surface and plug your appliances in and away you go.

Starting is easy. Although it is a recoil start and not an electric start it is super easy and can be done by anyone with minimal effort. The auto-decompression feature effectively reduces compression. This makes the generator easier to start up. This is especially handy for cold starts and will get your equipment and appliances up and running in no time.

Yet another benefit of this model is the smart throttle. This will adjust engine speed according to the power requirements. What this does is make the generator more fuel-efficient and reduces noise levels at the same time. This feature combined with the inverter technology makes the EF2000iSv2 highly fuel-efficient. You can expect as much as 10.5 hours runtime on a single tank of gas, operating at a ¼ load. That is impressive for such a compact and portable generator.

The fuel gauge is also handy and allows you to see the fuel levels at a glance. The gasoline petcock allows you to stop the gasoline flow and run the carb dry. The benefit of this is you will not have stale gas issues.

These features combine to make this an extremely versatile option. It is great for camping, tailgating, RV, boating and other outdoor adventures. It is also perfect for home backup in case of emergencies. Feedback from those that have bought and used this generator is extremely positive. It is a popular option that sells well and is well-liked.

Positives & Negatives

  • Light and compact, highly portable
  • Low noise levels
  • Good runtime
  • Smart Throttle for improved fuel efficiency
  • Inverter technology
  • Clean power – safe to use with sensitive electronics
  • 3-year limited warranty
  • Parallel ready
  • User-friendly
  • Fuel gauge
  • CSA, EPA, CARB approved
  • USFS-approved spark arrestor
  • Easy to start
  • Not enough power for larger applications
  • Relatively expensive
  • No electric start
  • Fairly high oil consumption

About the Manufacturer

Yamaha is a well-established brand with a stellar reputation. They have been going since 1955 and have been in the generator business for many years. They are known for durable products that are reliable and dependable. While they do not compete at the low end of the market, they offer good value for money.

Their generators are popular and trusted. One of the main advantages of the Yamaha brand is its extensive network of dealers and partners. This allows them to deliver good customer support. Obviously, they wish to maintain the brand reputation so this is an area in which Yamaha excels. Support and aftersales service are very important to them and something they do well.

While there are a number of great brands in the generator market, Yamaha is one you know and can trust based on their history.

Comparison Table

FeaturesYamaha EF2000iSv2Honda EU2200iWen 56200i
Fuel typeGasolineGasolineGasoline
Running watts1600 watts1800 watts1600 watts
Starting watts2000 watts2200 watts2000 watts
Runtime10.5 hours at ¼ load4 to 9.6 hours6 hours of half-load
Fuel tank1.1 Gallon0.95 Gallon1 Gallon
Starting typeRecoil starterRecoil starterRecoil starter
Noise level51.5 dBA at 1/4 load48 to 57 dBA51 decibels at quarter load
Weight44.1 lbs46.5 lbs48 lbs
Number of outlets2 x three-pronged 120-volt AC outlets, 1 x 12-volt DC outlet20A 120v Duplex2 x 120V 20A three-prong receptacles, 1 x 5V USB Port, 1 x 12V DC 8.3A
Safety features

  • Oil Watch Warning system

  • Electrical overload breaker

  • Low-Oil LED

  • Overload LED and alarm

  • Low-Oil Shutdown

  • Overload Protection

The first thing that stands out about the Yamaha EF2000iSv2 is the low weight. At just over 44 pounds it is the lightest of the three. It also boasts the largest gas tank as well as an impressive runtime. There is no shortage of outlets and it has good safety features.

While it might not be the most powerful of the three it is a good balance between size and performance and still delivers great power. Best of all is that it does it with very low noise levels.

These are all quality generators that are popular options but the Yamaha EF2000iSv2 does appear to have an edge over the competition.


Thanks to the “floating system”, a shock prevention feature, the EF2000iSv2 does not have to be grounded.

If the earth leakage breaker for “electric shock prevention” is connected to the outside of the generator then you should use the grounding pole.

Most engines do not enjoy starting and operating in cold or rainy conditions but the Yamaha beats them all. That being said, it will not operate effectively or safely when wet. You will need to create a cover or some form of protection from the elements to keep it operating.

Be sure to have ventilation in whatever enclosure you create. Cold starts should not be a major issue thanks to the auto-decompression system. This makes the generator easier to start in the cold.

Oil is not supplied with the generator and will have to be purchased separately. The recommended oil is: YAMALUBE 4 (10W-40), SAE 10-30 or 10W-40, SAE #30, SAE #20, SAE 10W. The grade should be API Service SE type or higher.

Yes, indeed it can. The EF2000iSv2 is parallel ready so it can be connected to the same or even earlier models such as the EF2000iS. This will double the power output. Twin Tech cables will need to be purchased separately.

Yes. There is an 8A 12V DC outlet that is ideal for this. The cables are included correctly so nothing additional needs to be purchased.

Inverters allow a generator to convert from DC power to AC power. It allows for clean safe power that is safe to use on sensitive electronics. It also means quieter operation and greater fuel efficiency.

This will depend on the power requirements of the various appliances. Certain items such as refrigerators, air conditioners, and heaters are a lot more power-hungry than lights, radios and smaller appliances. You should be able to look at each appliance and do a simple sum to calculate the number of appliances you can run at one time.

Also, remember that some larger appliances will need more power to get started than to run once on. This is why you need to look at the starting power or peak power as well as the running power.

Safety tips

The Yamaha EF2000iSv2 generator comes with a quick start guide as well as a detailed operator manual. It is important to read through these in order to ensure you operate the equipment correctly and safely.

Here are a few of the main points to note:

  • Fuel is flammable and poisonous
  • Exhaust fumes are poisonous
  • The muffler and engine can get extremely hot

One has to exercise due cation when refilling the gas tank. Only do this when the engine is off. Ensure that the generator has good ventilation and do not use in enclosed spaces. You also want to prevent the risk of electric shock so do not use the generator with wet hands or in wet or snowing conditions. The user manual is comprehensive and includes all safety and operational details.


Another benefit of Yamaha generators, particularly inverter types such as this model is that they are easy to maintain. They will obviously need to be serviced from time to time, depending on how often they are used, but there are many basic things you can do yourself with minimal effort. This will ensure the generator performs at its peak and will extend the life of the engine.

Here are the main areas of basic home maintenance that people should do:

  • Replacing engine oil (approximately every 20 hours of use)
  • Cleaning the fuel-tank filter
  • Checking and cleaning the spark plug
  • Cleaning out the fuel strainer
  • Cleaning the wire net on the muffler
  • Checking and cleaning of the air-cleaner element

Storing the generator

How you store the generator when not in use is important. It will affect the life of the machine and have a major impact on how easily it starts when you need to use it.

The procedure depends on how long the generator will be stored. For short term storage of a week or so, one only needs to close the fuel cock. Naturally, when you wish to use it again this should be turned back on.

During extended periods of storage, it is advisable to start and check the generator roughly once a month. For even longer periods of storage, disconnect the fuel tank and turn the fuel cock on. Then start the engine to run it dry. The low gas indicator will come on and stop the engine automatically. Drain any remaining fuel from the carburetor using the drain screw. Turn the engine and fuel cock off and store somewhere with good ventilation and low moisture.

These procedures will ensure the generator is stored safely without risk of damage and should make it easier to start when it is next needed.

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It is very hard to fault the Yamaha EF2000iSv2 generator. There are many good reasons why we chose to do a Yamaha EF2000iSv2 review. It is a compact and light model that operates with minimal hassle and fuss. It is fuel-efficient and has a good runtime while still delivering decent power for most needs. The unit is handy in a wide range of environments. The Yamaha name and the warranty will give you peace of mind that your generator investment will last. It is super easy to use and extremely efficient.

If you are in the market for a quality generator you cannot go wrong with the Yamaha EF2000iSv2. It will last you a long time and give you quality power for many applications.

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