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  • DuroStar DS4000S 4,000 Watt 7.0 HP OHV 4-Cycle Gas Powered Portable Generator
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DuroStar DS4000S 4,000 Watt 7.0 HP OHV 4-Cycle Gas Powered Portable Generator

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List Price: $479.99
Sale: $329.99 & FREE Shipping
You Save: $150.00 (31%)
In Stock.
Ships from and sold by Factory Authorized Outlet.
  • 4000 Watt Surge/3300 watt continuous
  • 4 Gallon gas tank/8 hour run time
  • EZ-Pull recoil start
  • EPA Approved
  • Automatic low oil shut off

Item Under Review

While this item is available from other marketplace sellers on this page, it is not currently offered by Amazon.com because customers have told us there may be something wrong with our inventory of the item, the way we are shipping it, or the way it's described here. (Thanks for the tip!)

We're working to fix the problem as quickly as possible.

9 new from $322.17 2 used from $294.39
This item’s packaging will be visible when delivered and cannot be gift-wrapped.

Frequently Bought Together

DuroStar DS4000S 4,000 Watt 7.0 HP OHV 4-Cycle Gas Powered Portable Generator + DuroStar DS4000S-WK Wheel Kit for DS4000S + Coleman Cable 01915 3-Feet Generator Power Cord Adapter, 10/3 Splitter Y Adapter, L5-30P to (2) Lighted 5-20R
Price for all three: $395.45

These items are shipped from and sold by different sellers.

Buy the selected items together

Compare to Similar Items

This item: DuroStar DS4000S 4,000 Watt 7.0 HP OHV 4-Cycle Gas Powered Portable Generator
Customer Rating (336) (129) (371) (217)
Price $ 329.99 $ 435.88 $ 394.94 $ 339.99
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By Factory Authorized Outlet CBIT Amazon.com Amazon.com
Power Source gas-powered propane-powered gas-powered gas-powered
Wattage 4000 watts 4000 watts 4400 watts 3500 watts
Voltage 120 volts 120 volts 120 volts 120 volts
Dimensions 17.5 inches x 23 inches x 18 inches 17.5 inches x 23 inches x 17 inches 24 inches x 36 inches x 24 inches 17 inches x 23 inches x 17 inches
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Product Details

  • Product Dimensions: 23 x 18 x 17.5 inches
  • Shipping Weight: 92.4 pounds (View shipping rates and policies)
  • Shipping: This item is available for shipping in the U.S. except for California and to select countries outside the U.S.
  • ASIN: B004918MO2
  • Item model number: DS4000S
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (336 customer reviews)
  • Amazon Best Sellers Rank: #9,565 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
  • Product Warranty: For warranty information about this product, please click here

Product Description

Product Description

Durable DuroMax 7.0 Hp, air cooled OHV engine with low oil shutoff . Heavy duty steel frame with four point fully isolated motor mounts for smooth and quiet operation. Full power panel with engine shutoff switch, volt meter, circuit breaker and power outlets. (2) Fully protected 120V outlets and (1) 120V twist-lock outlet. 8 Hour run time. All steel 4.0 gal. fuel tank with ez-read gauge. Low oil shut-off protects engine. Super quiet muffler reduces engine noise. Specifications: Max AC Output: 4000 watts / Rated AC Output: 3300 watts. Current: 120V, (2) 120v 20A 3-prong outlets (Standard Household plug), (1) 120v 30A twist lock. Low oil shutoff. EPA approved engines. Super quiet exhaust w/built-in spark arrestor. EZ-Pull Recoil start. 7.0 Hp air cooled OHV engine. Fuel Tank Capacity: 4.0 gal. Decibel: 69 dBA. Run-Time: at 50-Percent Maximum Output: 8.0 hrs. Includes: Spark plug wrench? Shipping Weight: 135.00-Pounds.


Great for camping, RVs, sporting events, home back-up power, job sites, and more, the DuroStar DS4000S gas-powered generator has a 7.0-horsepower air-cooled overhead valve engine with a recoil start that cranks out 3,300 constant running watts of power (and a peak of 4,000 watts; learn more about wattage needs below). This rugged workhorse is ideal for a wide variety of uses from getting you through a power outage to keeping you and your family supplied with all the necessary conveniences of home while being miles from nowhere.

DS4000S panel
Heavy duty steel frame with four-point fully isolated motor mounts (view larger).
DS4000S recoil
Recoil starting (view larger).

Note for California residents: This model is not CARB-compliant. Units sold to California must be CARB-compliant.

The power panel features the main controls, including start switch, volt meter, and circuit breaker. It offers two 120-volt, 20-amp, 3-prong outlets (NEMA 5-20R) to supply power to all of your home appliances, plus one 120-volt, 30-amp outlet (NEMA L5-30) for high-powered tools.

The DS4000S has an 8-hour run time at 1/2 load, and it has a 4-gallon fuel tank that also includes an easily readable gauge. The heavy duty steel frame has four-point fully isolated motor mounts for smooth and quiet operation. Other features include a recoil start, super quiet muffler that reduces engine noise (69 dBA rating), and automatic low-oil shut off to protect the engine. An optional wheel kit is also available for the DS4000S, enabling easy portability. Backed by a 1-year limited warranty.

What's in the Box

DuroStar generator; tool kit; operating instructions

Compare the DuroStar Portable Generators
Model # DS4000S DS4000WGE DS7200 DS7200Q
CARB compliant No No No No
Fuel Gas Gas Diesel Diesel
Arc welding -- Yes -- --
Enclosure Open steel frame Open steel frame Open steel frame Fully enclosed frame
Running watts 3,300 3,500 5,500 5,500
Starting watts 4,000 4,000 6,000 6,000
Engine 7.0 hp air-cooled OHV 16.0 hp air-cooled OHV 186F single-cylinder, 4-cycle, air-cooled 186F single-cylinder, 4-cycle, air-cooled
Starting method Manual Electric/manual Electric/manual plus
wireless remote
Electric/manual plus
wireless remote
Low oil shutdown Yes Yes Yes Yes
Spark arrestor No No Yes Yes
Fuel tank size (gallons) 4.0 7.0 3.83 3.83
Run time
@ 50% load
8 hours 8 hours 12 hours 12 hours
Outlets (2) 120V, 20-amp, 3-prong;
(1) 120-volt, 30-amp twist-lock
(2) 120V, 20-amp, 3-prong;
(1) 120-volt, 30-amp twist-lock
(2) 120V, 20-amp, 3-prong;
(1) 120-volt, 30-amp twist-lock;
(1) 120/240-volt, 30-amp twist-lock
(2) 120V, 20-amp, 3-prong;
(1) 120-volt, 30-amp twist-lock;
(1) 120/240-volt, 30-amp twist-lock
Handle style Optional Flip-up Flip-up None
Wheel type Optional Knobby all-terrain Slick style Built into bottom
Warranty 1-year, limited 1-year, limited 1-year, limited 1-year, limited


Your Generator Needs

To determine whether a generator is appropriate for your needs, you need to first add up the wattage of tools, appliances, and motors you want to run at the same time. Then select a generator with the running wattage rating to match or exceed the total load.

Keep in mind that tools and appliances with electric motors require additional surge wattage at startup that can be double or triple the normal running wattage requirement. Look at the surge watts required and make sure you choose a generator with enough additional wattage to start them. (And remember that you're typically not starting more than half of the items at the same time.)

Here's a sampling of power ratings for common household appliances.

Furnace Fan (gas or oil only) 1/8 HP 300 500
1/6 HP 500 750
1/4 HP 600 1000
1/3 HP 700 1400
1/2 HP 875 2100
Refrigerator 700 2200
Microwave Oven 625 800
Coffee Maker 1750
Toaster 1050-1600 0
Electric Range/Oven 12,500 0
Well Pump 1/3 HP 750 1400
  1/2 HP 1000 2350
Sump Pump 1/3 HP 800 1300
  1/2 HP 1050 2150
Lights On Bulb

Television 300 0
Garage Door Opener 1/4 HP 550 1100
  1/3 HP 750 1400
Portable Heater 100-1500 0
Hair Dryer 1100-1600 0
Iron 1200 0
Water Heaters Gas 500 1500
  Electric 7000-7500 0
Computers Desktop 600-800 0
  Notebook 200-250 0
  Monitor 200-250 0
Printer 400-600 0
Fax Machine 600-800 0
Cordless Telephone 100 0

Note: These are only estimated wattages. Please check your particular appliance for actual wattage.

Customer Questions & Answers

Customer Reviews

This generator runs very quiet.
I would definitely recommend this generator to anyone looking to buy a good quality product on a budget.
Timothy Ezell
I hope my review helps others as well.

Most Helpful Customer Reviews

398 of 409 people found the following review helpful By H. Zelizer on August 30, 2011
Verified Purchase
I bought this generator in preparation for hurricane Irene. Ordered it on Wen., it arrived on Fri., just in time to set it up before the storm (can't beat Amazon Prime!). The generator was easy to set up and started in one pull. This generator provided power sufficient to run the refrigerator, a mini-split a/c unit, TV, and a couple of fluorescent lights for two days. Under this load, a full tank (4 gallons) lasted around 12-14 hours. This unit appears to be a Chinese import so I do have my doubts about long-term reliability, never the less, the DS4000 appears surprisingly well-constructed and capable for the price.

Easy to Operate
Relatively Quiet (compared to a 22" lawn mower)
Easy to read fuel gauge

Recommended oil change interval of 20 hours (change the oil every other time you fill the gas tank?)
Oil drain obscured by frame below (as oil drains it runs along the frame and makes a mess)
No watt or amp meter (Has volt meter, but why?)
Earth grounding post and hardware (nuts and washers) are too small
Packaging is inadequate for UPS Ground Shipping (operating panel was dented on arrival)

Update 9/18/2012

It's been a full year since I've used this generator. After Hurricane Irene, I drained the fuel tank and changed the oil. This evening the power went out, so I filled the tank and the generator started on the second pull. I love this thing!

Update 11/5/2012

Just got the power back after 7 days; this time it was Sandy The DS4000 proved itself as the little generator that could, running 16 hrs/day for seven days without a problem. I've been using synthetic oil (Royal Purple SAE 30) and extending the oil change interval to once every 2 days (32 hours of use). Doesn't seem to use much oil, maybe down one or two ounces in this interval. I really do love this generator!
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326 of 335 people found the following review helpful By Trevor Mankus on June 5, 2012
Verified Purchase
I ordered this generator after the last season of hurricanes and storms in Northeast USA. My house is in a flood prone area and I wasn't going to go through another entire hurricane season with sleepless nights. My old generator stopped working last year so I knew I was in the market for a new one.

I paid $299 for this generator off of Amazon and another $39 for the wheel kit (DuroStar DS4000S-WK Wheel Kit for DS4000S). As of writing this review, the generator is down to $289.00. Either way, I would have paid $350 for this unit!

The packaging was great. There was no damage to the unit during shipping. My biggest complaint about packaging is that some oil seemed to seep out of the unit and onto the box so I had to be careful when opening it up. I ended up having to wipe the units frame down with a rag to dry it off. The unit does not ship with oil, but someone must have put oil in it at one point to test it out because there was a lot of oil in the box. One other note, be sure to remove the shipping mounting bracket! The easiest way to do this is to use the provided tool and loosen the nuts and bolts while the unit is sitting level.

We have not had to use this unit yet (thankfully) but I did get it running. I recommend purchasing an all purpose or transmission fluid funnel from your local automotive shop - this will help you to fill the oil tank without getting oil all over the place. The location of the oil fill is not very convenient, but with the proper funnel it isn't much of a headache. I imagine in the middle of a storm though that this could prove to be a huge design flaw. Once oil was added, I threw in some Unleaded 87 octane gasoline and it started up on the second pull. I let it run for about 5 minutes. The unit is QUIET! Very quiet.
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163 of 173 people found the following review helpful By Capt08 on November 10, 2012
Verified Purchase
I purchased this generator right after hurricane Irene. After hurricane Irene had damaged power lines in my neighborhood and being without power for 4 days I relied on my car battery to power lamps in my home using a power converter which included battery clamps. I decided to buy a generator as using a car battery during power outages can only go so far. Enter hurricane Sandy, I lost power again for 7 days where my new generator came into play to be used for the first time. I never operated or owned a generator before so I thought listing my experience here on Amazon in detail will help others like me.

This generator came with two open end wrenches, a screwdriver and a spark plug wrench. Once you open the box you will see that there is a block of wood inserted in the engine and tied down with a nylon strap. It also has a metal shipping brace attached to the bottom of the frame of the generator. These will have to be removed before you can use the generator. As per the manual you would have to turn the unit upside down on top of the foam pad that was shipped with this unit to remove the shipping brace. Removing the nuts and bolts from the shipping brace was impossible for me using the included cheap wrenches or even with my own pliers and open end wrench. The bolts connecting to the nuts were small and hard to turn. I had to use a large ratchet with a long handle using a 10 MM adapter which helped the bolts come off easily. Once everything was removed I then installed the wheel kit (DuroStar DS4000S-WK Wheel Kit for DS4000S) which I also purchased from Amazon. It helped me move my generator from my backyard to my garage when I was done using it at night. The generator is pretty heavy so moving it around without the wheel kit will be a challenge.
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