2014 Yamaha EF4000DE





Power to Spare.

Maintenance-free brushless alternator, electric start, and dual voltage (120 and 240), and economy idle, means a great home back-up power source and a hard worker on the construction site.

Key Features
  • The EF4000DE/D are the “all-star utility infielders” of the Yamaha generator team. They do everything well, quietly, efficiently, and still have power in reserve. The EF4000DE/D have the Yamaha 357cc OHV engine with a unique combustion chamber design that enhances power output and efficiency.
  • For those who want the power and glory of electric starting, there’s the push-button start EF4000DE with all the same features and specs as the manual-start EF4000D.
  • Thanks to its extra-large fuel tank, the EF4000DE/D can run continuously for 8.2 hours at rated load without refueling.
  • Full power, full time 120/240 dual voltage which allows you to run multiple appliances that require 120 or 240 voltage making it highly versatile.
  • Yamaha’s Oil Watch warning system prevents engine damage, avoiding costly repairs and minimizing down time.
  • Full power, full time 120/240 dual voltage — Highly versatile.
  • OHV engine — Improved efficiency, increased reliability, quieter operation.
  • Advanced combustion chamber design — Improves power output and fuel efficiency.
  • GFCI — Ground Fault Circuit Interruption shut off power. It senses a leak to ground to reduce risk of electric shock.
  • Cast iron cylinder lining — Provides long engine life and consistent performance during continuous use.
  • Transistor Controlled Ignition (TCI) — Fast, easy starting, reliable operation, maintenance-free.
  • Oil Watch Warning System — Prevents engine damage to avoid costly repairs and minimize down time.
  • Economy idle — Improved fuel efficiency and quieter operation.
  • Auto-choke system — Easier starting, especially in cold weather.
  • Voltmeter — Easy monitoring of power output.
  • AC non-fuse thermal circuit breaker — Added durability and peace of mind.
  • EPA & CARB Emission Engine Life Rating — Yamaha generators have the longest emission engine life ratings issued by the environmental Protection Agency and the California Air Resources Board.
  • 50 state legal — Meets emission regulations, including CARB.
  • Lifting eye — Convenient for hoisting.
  • Electric starter — Ease of operation
  • Type: Dual voltage, Brushless, AC Generator
  • Maximum AC Output: 4000 watts
  • Rated AC Output: 3500 watts
  • Rated / Maximum AC Current: 29.0 / 33.0 amps @ 120V - 15.0 / 17.0 amps @ 240V
  • Engine: OHV, air-cooled, single cylinder, 4-stroke
  • Displacement: 357 cc
  • Starting System: Electric with recoil backup
  • Overall Length: 35.2 in
  • Overall Width: 20.5 in
  • Overall Height: 22.7 in
  • Dry Weight: 196.2 lb
  • Fuel Tank Capacity: 6.1 gal
  • Continuous Operation at Rated Load: 8.2 hr
  • Noise Level: 72.0 dBA
  • Warranty: 3 Years Limited Warranty



Engine Type
OHV, air-cooled, single cylinder, 4-stroke
357 cc


35.2 in.
20.5 in.
22.7 in.
196.2 lb.


AC Output
Maximum: 4000 W; Rated: 3500 W
Fuel Tank Capacity
6.1 gal.
Noise Level
72.0 dBA
Run Time
8.2 hrs.

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