2017 Yamaha EF12000DE


Really, there’s just not much our highest-output gas-powered 120 / 240-volt output generator can’t handle.


  • DUAL VOLTAGE: Provides the versatility of 120 and 240V operation
  • OHV ENGINE (OVERHEAD VALVE): Precise valve actuation and heavy-duty design offer improved efficiency, increased reliability and quite operation
  • CAST IRON CYLINDER LINING: Provides optimal heat dissipation, consistent performance during continuous use and long engine life
  • OIL WATCH WARNING SYSTEM: Automatically shuts off before oil level is low and cannot be re-started until oil is added. Prevents engine damage and costly repairs while enhancing long-term durability
  • AUTO VOLTAGE REGULATION: Guarantees correct power delivery even with extension cords, enhances performance, adds convenience
  • TRANSISTOR CONTROLLED IGNITION (TCI): Provides clean, efficient spark that ensures fast, easy starting. Low maintenance, reliable operation
  • NOISE SUPPRESSOR: Reduces electrical interference with TVs and radios
  • AUTO DECOMPRESSION: Automatically “opens” exhaust valve slightly to reduce initial back pressure when starting making manual starting effortless
  • USFS-APPROVED SPARK ARRESTOR: Offers quiet operation and keeps sparks from exiting exhaust system, reducing chance of fires caused by an errant spark
  • GFCI: Ground Fault Circuit Interrupter shuts off power when it senses a leak to ground to reduce risk of electric shock
  • FUEL GAUGE: Lets operator monitor how much fuel is left
  • ELECTRIC STARTER: For convenient ease of operation
  • ECONOMY IDLE: When there is no load on the generator, it automatically returns to idle for improved fuel efficiency and quieter operation
  • AC NON-FUSE THERMAL BREAKER: Protects AC circuit in case of an overload for added durability and peace of mind
  • WHEEL KIT: Easier service, added value
  • TOOL KIT: Makes service easier
  • Wheel kit Easier service, added value

Top Features

  • With up to 50 amps 240V and 120/240 dual voltage output, the EF12000DE can handle most anything during a power outage
  • The EF12000DE is our highest output gasoline-powered 120/240- volt output generator
  • It uses a twin-cylinder 653cc, 4-stroke, OHV engine to deliver 12,000 watts maximum AC output with outstanding fuel efficiency
  • It has the convenience of electric starting (battery not included) and its compact size makes it highly portable
  • It provides 8 hours of continuous operation at rated load without refueling to power up super heavy-load equipment like well pumps, air compressors, table saws and more. Great as a backup generator

General Information

Manufacturer Yamaha
Model Year 2017
Model EF12000DE
Model Code EF12000DE
Color Blue


Length 33.3 in.
Height 33.3 in.
Width 29.6 in.
Weight Dry - 327.8 lbs.



Maximum AC Output - 12,000W

Rated AC Output - 9,500W

Amps Rated / Maximum AC Current - 79.2 / 100A @ 120V; 39.6 / 50A @ 240V


Engine OHV, 4-stroke
Displacement 653 cc
Cylinders Twin
Cooling Air
Run Time 8.9 hrs. @ rated load
Fuel Tank Capacity 11.4 gal.


Warranty 3 Years