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

In-Depth Review


Introducing The Quietest, Most Portable and Most Fuel Efficient Generator Available

Jamey’s Overview

Yamaha Inverter Generator IsoView

I have rated the nearly silent and very portable 44 pound inverter generator by Yamaha as the #1 top portable generator, #1 top camping generator, #1 quietest generator, #2 top generator for the money and #3 top generator for general home use.

The reason why it gets these accolades is because it is very quiet, very fuel efficient, very portable and very reliable.

  • Quietest. You won’t even know when this puppy is on. This Yamaha is an inverter generator. It uses a microprocessor/computer to coordinate its engine speed to the actual load. This means that if you only have a light plugged in to your generator it will sense what power is required and lower its engine speed to decrease noise, increase fuel efficiency and prolong engine lifespan.
  • Fuel Efficient. You will continuously wonder why you never have to refill the fuel tank. Because this generator uses inverter technology with a different than conventional alternator it can have a smaller engine size per power requirement and it can adjust its engine speed via its smart throttle. The combination of a smaller engine, and, that smaller engine running at a lower speed equals a highly fuel efficient generator. In fact, this generator when running at half load will only drink through a can of soda worth of fuel per hour.
  • Very Portable. You will find yourself wanting to take your new generator to work with you, to the gym, to the job site – everywhere you go. When you have a generator that is light, compact, reliable, fuel efficient, enviro friendly and powerful enough for your needs you will feel the urge to take it with you everywhere (just in case). Being only the size of a packed briefcase you will definitely be impressed with the places this generator can fit during transport.
  • Very Reliable. The fact that this generator is an inverter generator automatically adds to its reliability. An inverter generator is computer controlled and can adjust its engine speed to match required load. This increases  lifespan because the less revolutions the better. Yamaha has also ensured this technological marvel can provide you utility supply quality electricity so you can rest easy powering your sensitive electronics.
So as you can see this genset has some serious benefits. It is the quietest generator, most fuel efficient, most portable and extremely reliable with at least double the engine lifespan of other conventional generators.

See Features and Benefits of Yamaha Here →


Features and Benefits of the Yamaha EF2000iS Portable Inverter Generator

Yamaha EF2000iS Inverter Generator

Smart Throttle – Used to decrease the engine speed when you do not require full power. This allows for the generator to save fuel and increase engine lifespan. You will barely ever have to refill the fuel tank (1.1 gallons every 11 hours at 1/2 load). And, you will get to enjoy this generator for years to come by doing the simple maintenance as mentioned in the user manual.

Super-Quiet Muffler – Yamaha has installed a superior sound reducing and emission controlling muffler to their inverter generator. Part of the reason this genset is approved for use in all US states is because of this USFS (United States Forestry Service) spark arrestor approved muffler. You will be able to take this generator with you camping, turn it on next to you, and forget it is even on while providing you the electricity you need.

Advanced Inverter System – An inverter generator uses a rectifying bridge diode and computer controlled inverter to turn its 3 phase AC into DC and clean, pure 60 hertz AC. You can rest easy knowing that this electricity is utility supply quality. Good enough to plug your sensitive electronics with microprocessors straight in.

TwinTech Parallel Function – You can hook up 2 Yamaha EF2000iS generators to provide you double the electricity. All you need is some inexpensive extra cables and it’s a matter of plug them in an go. A great option for those that require a little extra juice in times of need.

OHV Engine – Yamaha has installed an extremely advanced gasoline powered overhead valve engine to provide the mechanical energy required to produce the electricity you need. The OHV engine is smarter, smaller and can run at lower speeds than conventional generator engines. It has a “smart throttle” which essentially just means it has a computer controlling its speed to maximize fuel economy and engine life.

Oil Watch Warning – Being so quiet and with such a long run-time this generator has the ability to fall into the background with you forgetting it is even on. For this reason, it needs some protection from human error. One of the systems this generator uses is an oil watch warning system. When it senses poor engine lubrication it will shut the engine down preventing engine damage. This is ideal because you can concentrate on more important things like roasting marshmallows, having a chat or drinking beer.

Electrical Overload Breaker – In case you try to hook up more electrical appliances than this generator can power, the generator will not shut on or, it will shut off if it was already running. This is all a good thing and works because of the electrical overload breaker.

Easy Access Side Panels – To keep the warranty valid you will need to follow the generator user manual. In it, you are told to do regular service. For example, you need to check the spark plugs and replace when necessary. To easily perform your required maintenance Yamaha has designed this genset with detachable side panels. When you need to do maintenance all you need to do is detach the panels and take a look. No wasting time unscrewing things…

See Specs of Yamaha Here →


Specifications of the Yamaha EF2000iS Portable Inverter Generator

Model Details

Brand: Yamaha

Brand Websitewww.yamaha-motor.com (click on Outdoors for generators)

Model: EF2000iS (2,000 Surge Watts and 1,600 Running Watts)

Model Webpage: Yamaha EF2000iS Portable Inverter Generator

Yamaha EF2000iS Generator Power panel


Fuel Type: Gasoline

Run-Time: 8 – 9 hours at half load

Fuel Tank Size: 1.1 Gallons

Fuel Gauge: Yes

Watts: 2,000 surge Watts, 1,600 running Watts

Alternator: Inverter

Frequency: 60 hertz

Sound Level: 51.5 dbA at 1/2 load (Easily have conversation next to it)

Outlets: (1) 12V DC, (2) 120V AC – up to 16.7 Amps


Brand: Yamaha

Starter: Recoil

Size: 79 cc

Oil Level Alarm: Yes


Dimensions: 19.3″ Length x 11″ Width x 17.9″ Height

Weight: 44 Pounds

Warranty: 3 Years

See Reasons to Buy Yamaha Here →

Reasons To Buy

5 Reasons to Buy the Yamaha EF2000iS Inverter Generator (and Some Customer Complaints)

Yamaha Generator With Gas Can

1) It’s Light-Weight

With a weight of 44 pounds it is very much a portable generator – about the same weight as a cooler of 15 or so bottles of beer with ice. You can take it with you camping, on your boat, to your friends barbecue and anywhere else that you want your new toy to come with you.

2) It’s Compact and Very Portable

With a volume of 2.2 cubic feet it is roughly the same size as a briefcase. You will have no trouble squeezing it between the seats on your boat or into the back seat of your car when you head off with the wife and kids for a picnic.

3) It’s Quiet

With a running sound level of 51 dBA at 1/4 load and 61 dBA at full load it will not interfere with your conversations. And, in fact, it is only about as loud as your refrigerator. Quiet enough?

Sound SourceSound Level (dBA)
Human Hearing Threshold0
Whisper Quiet Library30
Yamaha 2,000W Inverter Generator51.5 at 1/4 Load
61 at Rated Load
ETQ 3,500W Portable Propane Generator65
Normal Conversation65
DuroMax 4,400W Portable Gas Generator69
Vacuum Cleaner75
ETQ 4,900W Portable Diesel Generator82
Lawn Mower90
Jet Engine at Takeoff140

4) It’s Environmentally Friendly

With a brushless inverter alternator this Yamaha generator is top of the class when it comes to fuel efficiency and environmentally friendly power generation. It can run for more than 10 hours off 1 gallon of gasoline and it is CARB (California Air Resources Board) compliant. So, if you live in California this generator is good to go.

5) It Has a 3-Year Warranty

In order to keep your generator warranty valid all you have to do is follow the maintenance tasks outlined in the user manual. This includes simple things like checking for leaks before use, checking and cleaning the air filter, checking the spark plug and other similar small tasks. If you do these in alignment with the Yamaha user manual you will have full protection from defects in material and workmanship for 3 years. You want that right?

Customer Complaints

1) It’s Expensive Compared to Similar Generators

This generator can provide 1,600 running Watts. Other generators, like the Champion 73536i inverter generator, cost almost half that and provide the same or more power. Despite this complaint, the Yamaha remains the most popular inverter generator on the market.

See a Comparison of All Yamaha Inverter Generators Here →


Take a Look At the Other Yamaha Inverter Generators

If you require more power than 2 kW (or less) then Yamaha also offers you the most diverse range of portable inverter generators on the market. An inverter generator is the more technologically advanced generator option. They are quieter, more fuel efficient, more portable and have a longer lifespan than conventional generators.

All these generators are portable inverter generators powered by gasoline.

Click Here Now to See More Info for the Yamaha EF2000iS Inverter Generator…

ThumbnailGeneratorPower (Watts)Fuel Tank SizeRun Time (Hrs)Weight (lbs)
Yamaha Inverter Generator 1000WYamaha EF1000iS10000.66 gallons12 (1/2 load)28
Yamaha EF2000iS Inverter GeneratorYamaha EF2000iS20001.1 gallons11 (1/2 load)44
Yamaha Inverter Generator 2400WYamaha EF2400iSHC24001.6 gallons9 (1/4 Load)70
Yamaha EF3000iSE Inverter GeneratorYamaha EF3000iSE30003.4 gallons21 (half load)152
Yamaha EF4500iSE Inverter GeneratorYamaha EF4500iSE45004.5 gallons8 (full load)194
Yamaha EF6300iSDE Portable Inverter GeneratorYamaha EF6300iSDE63004.5 gallons13 (1/4 load)200

Click Here Now to See More Info for the Yamaha EF2000iS Inverter Generator…

Copyright 2018 | Generator Reviews | Disclosures | Disclaimers | Terms | Sitemap