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2018 Yamaha EF12000DE





Invite Your Friends Over For Some Electricity

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

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
  • Dual voltage — Provides the versatility of 120 and 240 volt 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 (T.C.I.) — 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 Interruption 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 (Battery NOT included)
  • 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
  • Factory warranty — Covers the entire generator for defects in parts and workmanship for three (3) years
  • Type: Brush, AVR AC Generator
  • Maximum AC Output: 12,000 watts
  • Rated AC Output: 9500 watts
  • Rated / Maximum AC Current: 79.2 / 100.0 amps @ 120V - 39.6 / 50.0 amps @ 240V
  • Engine: OHV, air-cooled, twin cylinder, 4-stroke
  • Displacement: 653cc
  • L x W x H: 33.3 x 29.6 x 33.3 in
  • Dry Weight: 327.8 lb
  • Fuel Tank Capacity: 11.4 gal
  • Continuous Operation at Rated Load: 8.9 hr
  • Noise Level: 80.0 dBA
  • Warranty: 3 Years Limited Warranty
Available Accessories & Options
  • Accessory Remote Control — With a 33 ft. cord
  • Accessory Hour Meter/Tachometer — Keep track of running time for service needs
  • Am/Watt Appliance Load Tester — Gives quick, accurate readout of watts or amps used by 120 volt AC electrical devices
  • Yamaha Extended Service — Additional 1, 2 or 3 years of Y.E.S. is available
Price and specifications subject to change without notice. Please read your Owner's Manual and the product warning labels before operation.



Engine Type
OHV, air-cooled, twin cylinder, 4-stroke


33.3 in.
29.6 in.
33.3 in.
327.8 lb.


AC Output
Maximum: 12,000 W; Rated: 9500 W
Fuel Tank Capacity
11.4 gal.
Noise Level
80.0 dBA
Run Time
8.9 hr

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