This is serious, big league power. As an emergency generator that can run major home appliances, or as a primary source for your cottage or cabin, the EF6600DE gives you maximum power and versatility in a durable and reliable package.


Powered by our proven MZ360 engine the EF6600DE not only features electric starting but also dual 120 & 240 volt power too.

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  • Powered by Yamaha’s MZ360; 357cc, air-cooled (fan assist), OHV, 2-valve, 4-stroke, single cylinder engine with transistor controlled (TC) ignition.
  • Electric starting backed up by a manual recoil with an auto decompression system for a light recoil starter pull. Battery not included.
  • Auto choke for easy, no hassle starting
  • Cast iron cylinder liner provides excellent heat dissipation and extends service life.
  • Maintenance-free brushless alternator offers superior reliability and reduced maintenance.
  • Dual 120 & 240 volt output makes the EF6600DE very versatile
  • Non-fuse type circuit breaker (NFB) prevents internal circuit damage in the event of an over load.
  • Rated AC output for continuous use is 6,000 watts / 50 amps @ 120 volts & 6,000 watts / 25 amps @ 240 volts
  • Neutral bonded to frame
  • 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
  • Electrical “noise” suppressor reduces electrical interference with TVs and radios.
  • 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 & 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.
  • 3-year warranty for “residential / home” use or “commercial use.”
Additional information

Brushless, syncronous, AC Generator
Maximum AC Output (watts / amperes)
6600 W / 55 A @ 120 V & 27.5 A @ 240 V
Rated AC Output (watts / amperes) – Continuous Use
6000 W / 50 A @ 120 V & 25 A @ 240 V
AC Voltage & Frequency (HZ)
120 & 240V / 60 HZ
Voltage Regulator
Automatic Voltage Regulator (AVR)
Bonded to frame


MZ360; 357cc, air-cooled (fan assist), OHV, 2-valve, 4-stroke, single
Starting System
Electric with manual recoil (with auto decompressor)
Transistor Controlled (TCI)
Recommended Fuel
87 octane, regular gasoline
Engine Oil Capacity


L x W x H mm (in)
894 x 520 x 527 (35.2 x 20.5 x 20.7)
with battery
Dry Weight
93kg (205 lb)
Fuel Tank Capacity (L)
Operating Hours (@ rated load)
6.6 hrs
Noise Level (@ 7 metres)
74 dB


Non-Fuse Circuit Breaker System (NFB)
Dual 120 & 240 Voltage
Auto Choke System
Oil Watch Warning System
Fuel Level Gauge
Economy Control System


Transportation Wheel Kit
Remote Control Starter


Private Use†
3-years limited
Commercial Use†
3-years limited