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The Yamaha ef2000is - 1600 watt inverter generator is available for purchase today.

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Yamaha EF2000iS - 1600 Watt Inverter Generator

(Based on expert analysis, manufacturer ratings and customer reviews)

4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5
142 Reviews
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Run Watts
Rated Watts
Surge Watts
Starting Watts
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Inverter System with Pulse Width Modulation (PWM) Control
Can safely run products with built-in microcomputers

Noise Block™ Sound Reduction System

Super-quiet Muffler with USFS-approved Spark Arrestor
Only 51.5-61 dB(A) & eliminates errant sparks

Light Weight & Compact
44 pounds - easy to move, transport and store

OHV Engine with Cast Iron Cylinder Liner
Efficient, reliable, powerful & provides long life

Auto-decompression System
Reduces compression for easier starting

Smart Throttle™ Varies Engine Speed Based On Load
Improves fuel economy and reduces noise

OilWatch™ Warning System
Prevents engine damage and provides added peace of mind

DC Outlet
8amp 12V outlet for charging batteries (cables included)

TwinTech™ Capability (sold separately)
Hook up two EF2000iS’s for 3600 watts of max power

Oil Not Included

  Model Number:EF2000IS
 Made in USA:No
 Starting System:Recoil Start
 HP/CC:79 cc
 Consumer Engine Warranty:3 Years
 Commercial Engine Warranty:3 Years
 Engine RPM:Inverter
 Low Oil Alert/Shutdown:Yes
 Cast Iron Sleeve:Yes
Product Specs
 Voltage120 Single-Phase
 Frequency:60 Hertz
 Auto Voltage Regulation:Yes
 Fuel TypeGasoline
 Rated Amps:13 Amps @ 120 Volts (Single Phase)
 Portability Kit:Unknown
 Tank Size:1.1 Gallons
 Run Time (50% Load):8 Hours
 Fuel Tank Material:Plastic
 Fuel Gauge:Yes
 Decibel Rating @ 7m:51.5-61 db(A)
 Idle Control:Yes
 Hour Meter:No
 Voltage Meter:No
 Lifting Eye:No
 Neutral Type:Floating
 Assembly Required:No
 Weight:44 Lbs. (19.96 kilograms)
 Dimensions:19.3"L x 11"W x 17.9"H
(49.02 x 27.94 x 45.47 cm)
 Consumer Warranty:3 Years
 Commercial Warranty:3 Years
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10-Amp DC
NEMA 5-20R (Wall-Type)

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*Ask Mike about the Yamaha EF2000IS. Sorry, no repair questions:




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  14 Questions
Q: I have a customer running propane on a Yamaha genset. While burning propane the engine burns excessive oil, not a problem on gasoline. Any ideas?
by Shane Bland from Florida on June 24, 2014

A: The Yamaha portable generators are engineered and warranted to operate on gasoline only. The reason your customer is burning through oil is due to the excessive temperatures of the unit.

Gasoline burns at 485 degrees F whereas propane burns at 1008 degrees F which will cause excessive heat within the engine in turn burning off the engine oil.

by Mike, Product Expert
Q: I was interested in buying the Generac GP17500E. I did my homework and believe it is the one for me. The questions I have are:

1. Can I convert it to propane?

2. How long will a 15lb propane tank last on this generator if I'm not powering the whole house and just the bare necessities?

Thank you Ryan

by Ryan from New York on October 16, 2013

A: Thanks for your inquiry.

We at Power Equipment Direct do not recommend converting your gasoline portable generator to an alternative fuel and doing so will void the manufacturer’s warranty and may cause damage to the generator itself. These conversions are not recommended by any of the generator manufacturers.

Gasoline has an Ignition Point of 475–536 °F. When a generator is manufactured to run solely on gasoline these temperatures are taken into consideration and the engine components are made to handle these temperatures.

Propane (LP) has an Ignition Point of 920-1020°F and Natural Gas (NG) has an Ignition Point of 900–1500°F. These higher temperatures will cause damage over time on any “gas only” powered engine.

The following guidelines cover Honda engines (Also applies to other engine manufacturers) modified to run on fuels other than the one for which they were designed, such as converting an engine to run on propane (LP) or natural gas (NG).

• Honda gasoline engines are certified to operate on unleaded fuel with a pump octane rating of 86 or higher, containing no more than 10% ethanol (E10).

• Any change to the original configuration of a certified Honda engine is a potential violation of the Clean Air Act prohibition against tampering (40 CFR §1068.101(b)(1)). The tampering prohibition is important because poorly designed and installed modifications can increase emissions.

• The Clean Air Act prohibits anyone from removing or rendering inoperative any device or design element installed on engines in compliance with regulations. These actions are considered tampering, which carries a civil penalty up to $37,500 for each engine or equipment in violation.

• Engines converted by a third party (OEM, dealer, converter, etc.) to run on a different fuel type must be recertified with the EPA on the new fuel to comply with applicable emission standards. The third party must recertify under a new family and notify Honda to not include the modified engines in the original family.

• Converted engines to be sold for use in California must meet CARB requirements and the converter must obtain approval from CARB. EPA certificates or tampering exemptions will not satisfy the requirement for CARB certification.

• Once certified, the third party must remove the Honda emission control label and apply a compliant emission control label for the new fuel indicating the new certifying manufacturer. Honda will no longer assume any responsibility as the certifying manufacturer.

• The Honda Distributor's Limited Warranty does not extend to parts affected or damaged by the conversion to or use of fuel other than the fuel for which the engine was originally designed.

• Honda offers V-twin engines specifically designed and certified for use in LP/NG applications. The engines incorporate special design features that address the higher combustion temperatures and reduced lubrication to the valve guide area (since it is a dry fuel, not liquid). Please contact your sales representative or distributor for additional information.

Disclaimer: The guidance provided is intended for Honda dealer/distributor informational purposes only and not for the purpose of providing legal advice. You must contact the appropriate certifying agencies if you require information on how regulations apply to your specific application.

The regulations and additional information can be found at these web sites:



The run times will always vary based on the actual load put on the generator.

by Mike, Product Expert
Q: Is the Yamaha 1000is generator USFS compliant?
I want to use on forest service land.
Spark arrestor etc.?
Ditto for the 2000 model.

Thank you

by Don from Washington on October 09, 2013

A: Thank you for your inquiry....

Yes, the Yamaha inverter generators meet all USFS requirements and they all include spark arresters.

by Mike, Product Expert
Q: I just ordered a Yamaha 2000 generator. What type of oil do you recommend? Preferrably an oil I can buy anywhere. Synthetic vs. traditional? 10w-40?
by Nate from Minnesota on September 17, 2013

A: Thank you for your inquiry.....

Per the owner's manual (Page 28), available on our site under the specs tab, list the following:
Recommended engine oil:
A. Yamalube 4 (10W40)
SAE 10W30 or 10W40
B. SAE #30
C. SAE #20
D. SAE 10W
Recommended engine oil grade:
API Service SE type or higher
Engine Oil Quantity:
0.4 L (0.42 US qt., 0.35 lmp qt.)

Owner's Manual

by Mike, Product Expert
Q: Do you recommend conversion to Propane for the Yamaha EF2000iS? And which fuel, gasoline or propane gets the most 'bang' for the buck?
by LYLE ARAKAKI from Hawaii on May 11, 2013

A: In regards to your question, the Yamaha generators are engineered and designed to operate on gasoline only and they do not have a specific conversion kit. We recommend using gasoline only because if you use a different fuel type you will void the warranty.

With these units designed and engineered to operate on gasoline, which has an ignition temperature of 485 F and Propane/Natural Gas has an ignition temperature of 1008 F, by changing the fuel type that over time you can easily damage the internal components of the engine and shorten the life of the unit.

by Mike, Product Expert
Q: Can you recommend a Transfer Kit for this Generator?
I would need an Inlet Box as well.

by GH from Maryland on February 07, 2013

A: The following switch is the best recommendation for use with the Yamaha EF2000iS which only produces 120V so the switch will only handle 120V.

Model 15114A

The switch comes with a standard 15A outlet but if you need to have an outdoor inlet box then the following model would be the correct one...

Model PB15

by Mike, Product Expert
Q: What is a inverter generator?
by Francine Breland from New Jersey on December 28, 2012

A: An inverter generator is a power generator that can process raw power into a power feed similar to the power received through power lines. The generator part of an inverter generator is usually powered by gasoline or diesel fuel. "Inverter" means that the power is converted from direct current (DC) into alternating current (AC).

Typically inverter generators are much smaller then standard open frame style generators and tend to operate at very low noise levels. This makes them perfect for tailgating or camping and in some cases able to power one or two items in your home in an emergency.

by Mike, Product Expert
Q: I am looking at the Yamaha 2kw to power a small 5000 btu a/c on a boat. I have read several reviews that the Yamaha can power it...would you agree?
by Steve from Florida on September 12, 2012

A: The average 5000 BTU AC unit can require an estimated 1300 - 1600 watts at start-up so based on that it should be able to handle it.

However, the only true way to tell is to find out the starting amperage and calculate it using Ohms Law...

Starting Amps x Volts = Watts

by Mike, Product Expert
Q: We have a high efficiency Triangle Tube boiler that was installed 2 years ago. According to my plumber my 30 year old Honda generator is the reason the boiler's electronic switch would not turn on during a recent power outage. I never had a problem with the 30 year old boiler that the new one replaced. Is my plumber correct?
by Steve from Alaska on September 11, 2012

A: Probably. I have a Triangle Tube boiler in my home for radiant floor heating & had to factor in the controller on it, as well as the high efficiency furnace, when putting in my new generator. These new solid state controllers are sensitive to voltage and harmonics. If either aren't within the design specs of the board the controllers wont recognize the power from the generator.

The key is to oversize the generator and ensure that the new generator has greater voltage regulation capabilities and cleaner waveform. These weren't requirements 30 years ago and your Honda of that era probably served you well. For today, you would have to replace the generator with a newer model.

If you had a 5kW Honda in the past (guessing) then a new EU6500 would be an ideal upgrade. You could also explore an automatic standby unit as they will have clean power and tight voltage regulation as well. If you need help choosing a new generator, please give us a call. We can help you navigate thru the options.
by Mike, Product Expert
Q: I am looking to purchase the 2000iS and need to know what adapter to use to plug into my 30 amp TT?

by Josie from Arizona on August 22, 2012

A: Since this generator has standard 20A outlets you would want to use the following adapter...

20A to 30TT Adapter
by Mike, Product Expert
Q: I want to get 2 Yamaha 2000 watt generators to run together. Are there 2 different generators or at they the same generators? These need to be wired together to double their power. What are the part numbers I need to get the 4000 watt capacity?
by Al Watson from Utah on June 23, 2012

A: You would get 2 of the EF2000iS generators along with the Reliance Controls Sidewinder parallel cable if you are connecting to your RV cord.

If you are connecting to a manual transfer switch in your home you would want the Yamaha Twin Tech parallel cable instead since it has a 30A twist lock connection instead of the 30A RV connection.

by Mike, Product Expert
Q: Jim, We just bought a 24' Rinker cabin boat, and would like to use this generator for our air. what are your thoughts on that? Is it safe?
by Audrey Johnston from Missouri on June 07, 2012

A: Unfortunately, the EF2000iS will not be large enough to run you RV AC unit. A typical 13,500 BTU AC unit requires approximately 2800 watts at start-up.

You would be able to do it if you purchase another one and then parallel them together with a parallel cord. This will provide you with enough starting wattage to start and run your AC and some other conveniences in the RV.

I would recommend the Sidewinder cable as the perfect cord to use when paralleling the Yamaha units.

Your other option would be to go with a larger inverter generator like the Yamaha EF2800iSE or the boost model if you just want to have one unit.

Any of the inverter models are safe to use and extremely quiet and meet all National Forestry regulations for noise levels.
by Mike, Product Expert
Q: Can you connect two EF2000iS generators and make a 4000 watt generator? If you can, do you have an RV adapter to connect the generators and connect your RV?
by Bobby Walters from Texas on February 07, 2012

A: You can parallel 2 of the EF2000iS Yamaha portable inverter generators. The following Reliance Controls Sidewinder parallel cable has a RV connection.

Reliance Controls Sidewinder Parallel Power Cables

by Mike, Product Expert
Q: Does the Yamaha 2000inverter generator warranty cover parts and labor for three years? It's for camping use, not commercial. Thanks
by John Miller from New York on January 26, 2011

A: This model Yamaha generator has a 3 year consumer warranty which would cover recreational/camping use. The owner's manual lists the fill limited warranty which you can review on our site.

Owners Manual

by Mike, Product Expert
Yamaha EF2000IS Reviews & Ratings
Write Review
Overall Rating
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5
Quiet (40)
Easy To Use (30)
High Quality (26)
Light Weight (15)
Easy To Store (12)
Expensive (14)
None (13)
Unreliable (2)
It Would Be Nice If One ... (1)
Did Not Like The Microwa... (1)
96% of respondents would recommend this product to a friend
142 Reviews  Sort by 
Mike, the Portable Generator Expert
Electric Generator Expert

Product Expert
Total Reviews
102 Reviews
Total Helpful Votes
5728 Helpful Votes
Electric Generators Direct Recommended

The lightweight, fuel-efficient Yamaha EF2000iS inverter generator provides a practical, versatile machine that can go anywhere with ease.

No need to power up the big onboard generator – you can run your little EF2000iS all night long on less than a gallon of gas.

Yamaha is the only inverter generator we offer on our site that is rated as "extended" with a 500 hour engine life. All others are rated at 250 or even 125 hours. This engine life rating does not mean the engine will... more
Mike Recommends This Model
Was this review helpful?
Purchased from Electric Generators Direct
Purchased 2/27/13
Total Helpful Votes
276 Helpful Votes
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
Fantastic Generator
This unit is Fantastic, All of the other reviews have summed it up.

I like it so much that I put together an in depth video that talks about my generator, how to find out how much wattage you need and how to choose a generator that's right for you. It was all of the information that I wish I had when I was doing the research that it looks like your doing right now.

Good Luck!
Pros: Easy To Use, Quiet, Price, Light Weight
Ryan Recommends This Yamaha Product
Was this review helpful?
Vito G.
St Cloud, MN
Purchased from Electric Generators Direct
Purchased 4/28/14
Most Helpful Critical Review
1 out of 51 out of 51 out of 51 out of 51 out of 5
I received a defective generator! The online charging function didn't work. The economy running mode didn't work. What more is there to say!
Pros: Quiet
Cons: Expensive, Low Quality, Unreliable, Bad Instructions
Mike, the Portable Generator Expert
Product Expert
We apologize for the issues you're having with your generator. Yamaha stands behind their products and offer a 3-Year warranty on this model. I've reached out to you and provided the the contact information for your local service centers.
Was this review helpful?
Pete A.
Orange, CA
Purchased from Electric Generators Direct
Purchased 2/22/14
Total Helpful Votes
12 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Portable Genset
First off, let me explain that I'm in no way connected with "Electric Generators Direct" as this review may appear. I searched everywhere on the web and with friends who had H**** gensets and finally made up my mind and called EGD. They were fantastic to deal with and even switched me to a tech support person who answered my questions regarding the Yamaha.

I ordered the unit and amazingly it showed up at my door in record time. I went to work testing this hotrod and wow did it... more
Pros: Quiet, High Quality, Features, Exceeded My Expectations
Cons: None
Pete Recommends This Yamaha Product
Pete's Experience With Electric Generators Direct
Web Site


"Electric Generators Direct is the "go to" place. Just would like to thank the people whom I spoke with about the Yamaha generator. Extremely helpful and knowledgeable and obviously customer service is at the top of their menu! Keep up the great work Ladies and Gentlemen. It's nice to be nice!"
Was this review helpful?
Verlin S.
Murray, UT
Purchased from Electric Generators Direct
Purchased 6/20/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Generator Satisfaction
Purchased the Yamaha EF2000iS to use with recently purchased Dutchmen trailer in campgrounds where generator noise is a concern. Started right up out of the box after adding gas and oil. Works well. However, it does struggle to run the microwave and higher watt appliances at high elevations, such as was the case in the Uinta's in Utah at 10,000 ft. Others I talked to had the same results with other brand generator, including Honda, at that elevation. Very satisfied with features,... more
Pros: Quiet, Easy To Use, Price, Features
Cons: None
Verlin Recommends This Yamaha Product
Was this review helpful?
Jeffrey P.
Frankfort, KY
Purchased from Electric Generators Direct
Purchased 7/2/14
4 out of 54 out of 54 out of 54 out of 54 out of 5
Yamaha Ef2000is - 1600 Watt Inverter Generator Review
Pros: Quiet, High Quality
Cons: Expensive
Jeffrey Recommends This Yamaha Product
Jeffrey's Experience With Electric Generators Direct
Web Site


"I plan to use the generator at high elevation for a trip out West - I need to know what is involved with modifications for that application and a local dealer that can provide me the needed service."
Mike, the Portable Generator Expert
Product Expert
Typically this would involve readjusting the carb to work at a higher altitude. I would suggest contacting Yamaha directly @ (800) 962-7926. They will be able to provide you with a list of dealers who can do the service work for you.
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Dave Lundsten
Coloado Springs, CO
Purchased from Electric Generators Direct
Purchased 8/19/14
4 out of 54 out of 54 out of 54 out of 54 out of 5
No Microwave
this will not run a 700 watt microwave 1600 continuous watt not enough to run 700 watt microwave - strange. And you have to take it to a Yamaha dealer to get the carb readjusted if you are above 4000 ft, according to the instructions. I was @ 7-8000 ft and it ran okay for me.
Pros: Quiet, Easy To Use, Light Weight, Reliable
Dave Recommends This Yamaha Product
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Joseph M.
Lavon, TX
Purchased from Electric Generators Direct
Purchased 6/26/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Happy Camper
Decided to purchase my Yamaha generator from EGD after doing the research . They shipped pretty fast, added the gas and oil and started on the first pull, it's light weight and perfect for my needs. We have a 30' camper and camp in the Colorado San Juan mountains. Works perfect for the heater and all other needs. Will purchase from these guys again. :)
Pros: Quiet, High Quality, Easy To Store, Reliable
Cons: None
Joseph Recommends This Yamaha Product
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Kirk S.
Winona, MN
Purchased from Electric Generators Direct
Purchased 9/19/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Love It
Using my Yamaha to temporarily power my off-grid cabin. Runs everything I need it too. Generators direct was easy to purchase through, and provided fast shipping.

I would only warn others that the generator must be on a very level surface and completely full of oil or the oil cutoff will shut it down. Overall I love the Yamaha generator.
Kirk Recommends This Yamaha Product
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Bruce M.
Pioche, NV
Purchased from Electric Generators Direct
Purchased 9/25/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Sweet Quality
Shipped timely, inside of a week to North California,
Do be sure to have small long funnels for oil fill.
Unit has an operable fuel vent on cap- Nice
Has fuel valve on face with rest of controls-Nice
Has a DC outlet
Has econ option switch, at 3000 thousand foot elevation, the unit runs four work lites and car battery charger on the econ cycle. It kicks up only for skill saw or similar, then when saw shuts off, unit drops back to very quiet fuel efficient low speed.
The unit is first class... more
Bruce Recommends This Yamaha Product
Bruce's Experience With Electric Generators Direct
Web Site


"Flawless, clear communication through shipping, a satisfying transactional experience. Will shop here first."
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Bruce T.
Fairview, NC
Purchased from Electric Generators Direct
Purchased 9/21/14
5 out of 55 out of 55 out of 55 out of 55 out of 5
Quiet And Powerful.
Use this to detail cars at site of the vehicle, use it as special events and as backup power source for our home.
Bruce Recommends This Yamaha Product
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Robert Hale
Sacremento, CA
Purchased from Electric Generators Direct
Purchased 8/6/14
4 out of 54 out of 54 out of 54 out of 54 out of 5
Purred Like A Kitten
Recently went camping with our new Yamaha generator and can't be happier with our purchase. Compared to my fathers Champion generator and other generators running in our campsite, you could hardly hear ours when it was running.
Pros: Quiet, Easy To Use, High Quality, Light Weight
Cons: None
Robert Recommends This Yamaha Product
Was this review helpful?
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Shop for the Yamaha EF2000iS - 1600 Watt Inverter Generator at Electric Generators Direct. Research Yamaha recreational portable generators online. Find Yamaha EF2000IS recreational portable generators & EF2000is inverter generator features and specifications. Get the best deal; compare Yamaha EF2000IS prices now. Buy the EF2000IS direct and save.