Standard Features
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Conquer power.

The EF4000 has two key features, a "Damper Winding" alternator for a cleaner sine wave and dual 120 and 240 volt power, making the EF4000 a very versatile unit. Powered by a proven 357 cubic centimeter engine with electronic ignition, the EF4000 is perfect for the job site, RV or home back-up.


Model Year
Starting at MSRP


26.7 in. (666 mm)
20.7 in. (527 mm)
19.8 in. (502 mm)
179 lbs. (81 kg) dry


MZ360, OHV, 2-valve, 4-stroke
357 cc
Manual recoil with auto decompression
Air (fan-assist)
Run Time
9.4 hrs. @ rated load
Fuel Type
87 octane regular gasoline
Fuel Tank Capacity
25 l
Oil Capacity
1.1 l


Maximum AC Output: 4,000W
Rated AC Output: 3,500W
Regulator: Damper winding
Maximum / Rated AC Output: 33.3 / 29A @ 120V; 17 / 15A @ 240V

Standard Features

 Powered by Yamaha's MZ360; 357 cc, air-cooled (fan assist), OHV, 2-valve, 4-stroke, 1-cylinder engine with transistor controlled ignition (TCI)  
 Auto decompression system reduces engine compression to provide a light recoil starter pull for effortless manual starting  
 Manual choke  
 Cast iron cylinder liner provides excellent heat dissipation and extends service life  
 Maintenance-free brushless alternator offers superior reliability and reduced maintenance  
 Dual 120 and 240V output makes the EF4000D very versatile  
 Damper Winding alternator reduces wave form distortion for "cleaner" power (power is almost as clean as an inverter)  
 Rated AC output for continuous use is 3,500W / 29.2A at 120V and 3,500W / 14.6A at 240V  
 Neutral bonded to frame  
 Non-fuse type circuit breaker (NFB) prevents internal circuit damage in the event of an over load  
 Economy Control system (when turned on) lowers the engine rpm when there is no load to conserve fuel and reduce noise and engine wear  
 Yamaha's Oil Watch Warning system automatically shuts off the engine when oil level is low and will not re-start until oil is added, preventing costly engine damage and enhancing long-term durability. Low oil warning light will illuminate on the front panel  
 AC volt meter provides easy to read voltage output  
 Easy access, washable foam air filter reduces maintenance costs  
 Easy access oil drain plug  
 On-off fuel petcock lets you shut off the gas to run the carb dry for storage, helping to prevent stale fuel problems, which are becoming more common with ethanol based fuels  
 Large fuel fill hole for easy filling. Fuel gauge is standard  
 Rubber vibration isolation mounts reduce vibration for smoother operation and reduced noise  
 Rugged perimeter frame protects the generator and engine from damage  
 CSA approved (Canadian Standards Association)  
 EPA and CARB Emission Engine Durability Rating. Yamaha generators have the longest emission engine durability ratings issued by the Environmental Protection Agency and the California Air Resources Board  

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*Price, if shown, is Manufacturer's Suggested Retail Price (MSRP) and does not include government fees, taxes, dealer freight/preparation, dealer document preparation charges or any finance charges (if applicable). MSRP and/or final actual sales price will vary depending on options or accessories selected.
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