The engine in the Yamaha EF2600 generator is a four-stroke, air-cooled, single-cylinder engine. This engine offers a 10.44 cubic-inch displacement. The engine in the Yamaha YG6600DE generator is also a four-stroke, air-cooled, single-cylinder engine, but it features a 21.79 cubic-inch displacement.
The EF2600 model generator is 20.1 inches long, 16.3 inches wide and 16.7 inches tall. This Yamaha generator weighs 90 pounds. The YG6600DE model generator is 35.2 inches long, 20.5 inches wide and 22 inches tall. This Yamaha generator is designed to a weight of 198 pounds.
The fuel tank designed into the EF2600 generator offers a 3.2-gallon capacity while the fuel tank in the YG6600DE generator offers a 5.5-gallon capacity. Both generators run on regular, unleaded gasoline. The EF2600 model operates at 67.0 decibels while the YG6600DE operates at 73.5 decibels.