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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
153 Reviews
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Run Watts
Rated Watts
Surge Watts
Starting Watts

Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

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
Overall Rating
4.9 out of 54.9 out of 54.9 out of 54.9 out of 54.9 out of 5
Quiet (43)
Easy To Use (30)
High Quality (29)
Light Weight (15)
Easy To Store (13)
Expensive (15)
None (14)
Unreliable (2)
Did Not Like The Microwa... (1)
Graat (1)
97% of respondents would recommend this product to a friend
153 Reviews  Sort by 
Tools In Action

Dan Maxey
Tool Expert From Tools In Action
Total Reviews
38 Reviews
Total Helpful Votes
347 Helpful Votes
Yamaha Inverter Generator Ef2000is
Inverters seem to be the popular way to go these days from the camp site to the job site. Everyone wants to be like the Honda inverter that is so quiet but no one wants to pay the price. Honda is a great brand but personally in this day and age I think they are bit overrated. Yamaha is the just as good as the Honda maybe not as quiet but it is a great little unit. We got ours with free shipping from The Tool Nut.

The Yamaha started first pull every time and sips fuel. It can run for... more
Dan Recommends This Yamaha Product
Was this review helpful?
Purchased from Electric Generators Direct
Purchased 2/27/13
Total Helpful Votes
318 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
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5 out of 55 out of 55 out of 55 out of 55 out of 5
Best Generator - Hands Down !!!
Hands down the best generator made. The generator is quiet, smooth, clean power, reliable and best of all the longest warranty in the industry. One thing nice about the Yamaha Generator is when you turn the fuel switch off - you actually drain the carburetor which eliminates bad gas issues vs. Honda uses the fuel shut off as a unit shut down and the carburetor is still full of gas. Which will lead to carburetor issues. Actually has a fuel gauge to see the level of fuel left in the tank.

... more
Pros: Quiet, High Quality, Reliable, Exceeded Expectations
Cons: None
Kristen Recommends This Yamaha Product
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Patricia C.
West Fargo, ND
Purchased from Electric Generators Direct
Purchased 6/21/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Easy For The Ladies!!
It was so easy to start, and light enough to carry around without too much effort. It did not run my AC on my little camper, but it ran everything else just fine. It runs forever on little gas! So much quieter than all of the other generators too!
Patricia Recommends This Yamaha Product
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Kevin C.
Custer, WA
Purchased from Electric Generators Direct
Purchased 10/27/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Very Impressed.
It came on schedule. I filled it with oil and gave it a little gas and it started on the first pull. It ran great I am so happy that I chose the Yamaha over the Honda, very well built. Electric Generators Direct was great. I would recommend to anyone that is looking for a generator.
Pros: Quiet, High Quality, I'd Buy It Again, Exceeded Expectations
Cons: Expensive
Kevin Recommends This Yamaha Product
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Douglas H.
Camby, IN
Purchased from Electric Generators Direct
Purchased 9/8/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Ef2000is
We love it. Is just what we need. Compact to transport for weekend and vacationing at our remote cabin. Does what we need. Small enough to be perfect to take back and forth.
Douglas Recommends This Yamaha Product
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Richard H.
Mission Viejo, CA
Purchased from Electric Generators Direct
Purchased 7/9/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Good Product
Product works well. I use it on a boat and it easily runs the battery charger and refrigerator (everything else, like lights, runs off the 12-v battery).

Awkward to fill the oil. Suggest having an oil-absorbing pad available so you won't have oil on your patio like I did. This problem is the reason for four stars on features.
Richard Recommends This Yamaha Product
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Ken F.
Bolingbrook, IL
Purchased from Electric Generators Direct
Purchased 10/8/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Lotta Power In A Small Package!
I needed 16 amps. I got two, put them together and Boom!!. Was a happy camper!! Nice system!! Can't beat it!!
Ken Recommends This Yamaha Product
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Steve R.
Green Bay, WI
Purchased from Electric Generators Direct
Purchased 5/13/13
Total Helpful Votes
97 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Are You Not Sure Between Honda Or Yamaha?
I was not sure between the HONDA or the YAMAHA until i did all the home work on it like your doing. The Honda seams to be the one to beat, and the YAMAHA DID IT! On you tube people start the Honda with up to 10 hard pulls, with the Yamaha I saw people start it with only 1 wimpy pull. You can also shut off the gas while the power is still on, so the gas thats still in the lines can burn out to keep the system clean. Honda can't do that. The motor is twice as good as the Honda for showing the... more
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Carl M.
Millis, MA
Purchased from Electric Generators Direct
Purchased 6/25/13
Total Helpful Votes
54 Helpful Votes
4 out of 54 out of 54 out of 54 out of 54 out of 5
Not As Quiet
Unit runs louder than my neighbors Honda of same size.
Pros: Easy To Use, Price, Easy To Store
Cons: Louder Than Advertised
Carl Recommends This Yamaha Product
Mike, the Portable Generator Expert
Product Expert
This Yamaha and the comparable Honda model have a very similar db(A) rating. There really shouldn't be any noticeable difference in the sound each generator is creating unless one of the units is running on an "Eco" mode and the other isn't or one has a full load on it and the other has a smaller load. Like any other engine, you many notice a slightly lower noise output after the initial break-in period.
Was this review helpful?
Richard R.
Purchased from Electric Generators Direct
Purchased 5/8/13
Total Helpful Votes
46 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
Shhhh!!!!!!!! Don't Wake The Generator
I purchased this Yamaha EF2000IS as a replacement for a Briggs & Stratton unit that was stolen from my boat. I can honestly say now that I am happy the old unit was stolen. This unit is everything that I thought it would be and more. The biggest thing for me was the noise factor. I ordered this online and the delivery was exactly as promised. I then put this unit (still in a sealed box) and put in on two flights overseas.

Upon arrival at my destination I took this machine to a... more
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