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

by Yamaha
| 83 answered questions

List Price: $1,099.00
Price: $989.10 & FREE Shipping. Details
You Save: $109.90 (10%)
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  • 1600 watt rated AC output, 2000 watt maximum AC output, 13.3/16.7 amps @ 120V
  • Super-quiet muffler with USFS-approved spark arrestor - 51.5 dBA at 1/4 load
  • Smart Throttle varies engine speed based on load - improves fuel economy and reduces noise
  • Inverter system with Pulse Width Modulation (PWM) control
  • CARB Compliant
23 new from $949.02 2 used from $875.00
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Frequently Bought Together

Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator, CARB Compliant, Blue + RV Generator Cover- 2000W by Yamaha + Hopkins FloTool 10701 Spill Saver Multi-Purpose Funnel
Price for all three: $1,033.59

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Compare to Similar Items

This item: Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator, CARB Compliant, Blue
Customer Rating (288) (98) (55) (69)
Price $ 989.10 $ 838.41 $ 1331.10 $ 559.00
Shipping FREE Shipping FREE Shipping FREE Shipping $ 30.49
Sold By Amazon.com Amazon.com Amazon.com SuperGen Products
Power Source gasoline-powered gas-powered gasoline-powered gasoline-powered
Wattage 2000 watts 3100 watts 2400 watts 2000 watts
Voltage 120 volts 120 volts Information not Provided Information not Provided
Dimensions 17.9 inches x 19.3 inches x 11 inches 19.7 inches x 24.2 inches x 18.5 inches 18 inches x 21 inches x 17 inches 16 inches x 19 inches x 13 inches
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Color: Blue
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Product Details

Color: Blue
  • Product Dimensions: 19.3 x 11 x 17.9 inches ; 44.1 pounds
  • Shipping Weight: 55 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Origin: Japan
  • ASIN: B002RWK9N2
  • Item model number: EF2000iS
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (288 customer reviews)
  • Amazon Best Sellers Rank: #2,243 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)

Product Description

Color: Blue


Powerful, portable, and efficient, the Yamaha EF2000iS Gas-Powered Portable Inverter delivers maximum electrical output without sacrificing portability. Thanks to its innovative inverter system, the generator is able to generate up to 2,000 watts of clean AC power. It can run up to 10.5 hours continuously without refueling and uses premium technologies to maximize fuel efficiency.

Yamaha logo
Inverter EF2000iS generator
EF2000iS Inverter
At a Glance
  • Combines powerful output with portability
  • Inverter system allows you to power delicate machinery
  • Fuel-efficient; can run for 12 hours without refueling
  • Lightweight and easy to carry
  • Backed by a 2-year warranty
Inverter EF2000iS generator

Compact and ergonomic, the EF2000iS is easy to store and transport. View larger.
Inverter EF2000iS generator

TwinTech technology allows you to hook up two units for added output. View larger.
Powerful Inverter System Delivers Cleaner Electricity
The EF2000iS is built around an innovative inverter system, which is able to deliver higher-quality, cleaner electricity than competing generators. It produces energy in the form of pure sine waves, which are cleaner and more reliable than most commercial power sources.

In simpler terms, this means that you'll be able to confidently power delicate machinery without having to worry about the damage caused by unrefined energy. An electrical overload breaker is also included, to prevent generator damage in case of an unexpected overload.

Smart Technologies for Optimal Fuel Efficiency
The EF2000iS is exceptionally fuel efficient, able to run for up to 10.5 hours without refueling when in Economy mode. Its OHV engine runs reliably and dissipates heat efficiently, allowing for both a long life and optimal fuel consumption.

With its Smart Throttle Load feature, the generator is able to dynamically adjust engine speed depending on output, resulting in greater overall fuel efficiency. The generator also features an exclusive dual coil alternator stator, which lowers engine speed and reduces total fuel consumption.

Ergonomic, User-Friendly Design
Weighing 44 pounds, the generator is ultra-portable and features an easy-to-carry design. It has a convenient, centralized control panel, which allows you to easily access all of the generator's features at the push of a button. It also starts up responsively due to its auto-decompression system, which reduces compression and makes start-up less difficult.

For added convenience, the EF2000iS is able to recharge batteries with its 8A12V DC output, making it ideal for RV, auto, and boat owners. You can even hook up two EF2000iS units for added output, thanks to TwinTech technology. And you won't have to worry about engine damage due to low oil levels: an oil-watch warning system constantly monitors oil levels and lets you know when an oil change is needed.

Noise Reduction for Quiet Operation
The EF2000iS uses noise reduction technologies to ensure the quietest operation possible. Featuring a special sound-blocking design, the generator has noise-absorbing glass wool construction, which helps dampen noise even during heavy operation. Along with the EF2000iS' super-quiet muffler and vibration-isolating feet, it helps keep noise to a minimum.

The EF2000iS is backed by a two-year warranty.

What's in the Box
Gas-powered generator

The EF2000iS has the EPA's longest engine emission life rating. View larger.

The EF2000iS recharges 12-volt batteries, making it ideal for boat, RV, and auto owners. View larger.

Customer Reviews

Very efficient and quiet!!!
Just follow the instructions in the manual and I know this thing will last a long long time.
Chris Wilson
I my opinion all Yamaha products are the best quality money can buy.

Most Helpful Customer Reviews

640 of 654 people found the following review helpful By trisailor on November 14, 2009
Color Name: Blue
This is a very high quality unit, nicely designed. I chose it over the Honda Eu2000i because it has a fuel gage and is a hair lighter (2 pounds), and liked the styling better. Specs are so close it's a tie... the Yamaha unit specs a bit quieter in "eco" throttle but the Honda specs a bit quieter at full power. Prior to this purchase I had bought a Honeywell inverter generator (a much less expensive Chinese-made knock-off) from Costco which I returned, because I was unimpressed with the Honeywell unit's quality and noise level. While the price difference is major, you get what you pay for in this case. Anyone looking at the cheaper knock-offs should really consider that a 5db increase in noise level is a major difference, the way humans perceive it.

The most impressive thing about this unit is how quiet it is. Even at full engine speed you can stand about 6 feet away and have a normal conversation without raising your voice, or talk on a cell phone without undue distraction. It features an "eco" setting which tapers down the engine throttle and noise when full load isn't required. At half-throttle or less, from about 6 feet away it is about half as loud and amazingly quiet. I used it to run a 50-amp 12v battery charger and at full charge level the charger only required the generator to operate at about half-speed, and when the charger tapered down the charge level to under 30-amps the generator became so quiet I literally forgot about it. It is MUCH quieter than my boat's inboard diesel engine, and more efficient than running the main engine just to top off the batteries. I also used it to power a heavy duty 120v grinder and it had no problems supplying the needed power, even on electric motor start-up.
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183 of 187 people found the following review helpful By Matthew Harper on August 31, 2010
Color Name: Blue Verified Purchase
This little gem arrived to me in perfect condition. Kudos to Amazon for their quick delivery time. The genny itself is bigger than the pictures let on, but for 2000watts, this isn't bad at all. THESE UNITS DO NOT COME WITH OIL IN THEM. Go buy some 4 stroke 10w30 oil at home depot or lowes. Follow the instructions to put the oil in, fill it gas, and turn it on. The pull cord is very easy. Just practice a couple of times. You will love this generator, I promise. I will use it for my travel trailer for camping/fishing during the colder months.

Edit: I've had two EFYamaha 2000is generators since the beginning of Sept, 2010 and have mainly used them for camping. The first workout for both of these units was tailgating. I also have a cord that connects the 2 of them to make 4000 watts, more than enough to power your camper A/C (13,000-15,000btu) and everything else in the RV. However, it was colder on this outing and I didn't need to use both hooked together yet. I did bring both of them though and I'm glad I did- here's why:

The guy next to me brought his 6000watt Champion generator, which is construction grade, and told me he was sorry, but would be running it in the mornings. We were about 15 feet away from him. I said no problem, it couldn't be that loud. He then turned it on for me so I could see. WOW! That thing was LOUD. I told him I brought a spare Yamaha inverter and he was welcome to use mine because I told him it would be much quieter. He came over and heard mine running and couldn't believe it. The next morning we were both sleeping soundly, both of us running these awesome Yamaha units.

Here are some tips for those considering this generator:
1) Get some fuel stabilizer.
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151 of 155 people found the following review helpful By Scott Kopper on March 6, 2010
Color Name: Blue Verified Purchase
This generator is super quiet and the engine runs really smoothly. It instantly changes it's operating speed just as fast as I can move the speed switch on a 1850 watt hair dryer I used to test it. It doesn't include oil and the angle of the oil fill hole is nearly horizontal, making it a little difficult to fill even with a funnel, but they did put a nice little drip tray right below the opening so it doesn't go everywhere. The gas gauge is really nice. Made in Japan. Their competitor (Honda) has some nice videos on their website demonstrating the sound level of actual generators running and the equivalent size Honda generator is very close in noise level to this one. Yamaha should do the same but until then, check out the Honda website.

Yamaha says this is CARB compliant on their website so I'm not sure why Amazon says it isn't. The label on the generator says it is a 3 on the 10 point California emission scale. Yamaha simply isn't making a big deal of it like some others do I suppose. This is a new model as of summer 2009. The starter cord is really easy to pull - unlike any other engine I've ever started by hand.
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201 of 210 people found the following review helpful By Paul Raymond on June 13, 2010
Color Name: Blue Verified Purchase
I purchased the EF2000iS 2,000 watt inverter-generator for extended fishing trips for charging 12 volt marine batteries and for running corded power tools in remote areas. At first I wasn't sure if the 2,000 watt model would be enough power to meet my needs, but I decieded to take a chance with it because of the price, and boy am I glad I did.

It easily powers drills, grinders, skill saws, table saws, sawzalls, and portable cement mixers - pretty much anything that draws under 16.7 Amps. Most power tools draw up to and under 15 Amps. My industrial right-angle concrete drill only draws 8 Amps, and that thing is rugged. It's more than enough for my needs for working in the woods where I can't just "Plug In."

Another thing that's slick about it is it also charges marine batteries and has its own special DC receptical and comes with the included cable. You just fire it up, hook up the terminals to your battery, then plug in the cord. It doesn't have a charge meter built in, so I purchased a hand held battery tester and check the charge level once an hour. I think the battery tester was under $30 (a good investment).

With that in mind, I used it last Memorial Day weekend during our Men's Family Fishing Trip out at Johnston Pond camp here in Maine, out in the woods roughing it with tents. The area is surrounded with small-ish ponds, so my dad and I brought our little skiff and trolling motor with us (too small ponds for our larger, 2-stroke boat). We brought two 12 volt marine batteries with us to make sure we could spend the whole day out each day, then that evening charge one or the other up so it was ready for the next day. It worked great, we didn't have to worry about running our batteries low and having to paddle all the way back to the landing.
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