MODEL Model / Model Code EF-4000DE SIZE AND WEIGHT   Physical Dimensions ( L x W x H ) 33.1" x 20.5" x 20.1" Dry Weight 145.5 lbs ENGINE:   Engine Type 4-Stroke, OHV, Air-Cooled, Single Cylinder Number Cylinders / Displacement / HP 1 / 251cc / 8.5hp Oil Type Yamalube 4, 10W30 FUEL TANK:   Capacity 4.8 gal Fuel Type Unleaded Regular COOLING SYSTEM:   Cooling Type Air Cooled CARBURETOR:   Main Jet / Pilot Jet / Pilot Screw (Turns Out) N/A GENERATOR:   Type Brushless / AVR AC Phase Single Maximum AC Output 4000 Watts Rated AC Output 3500 Watts Rated AC Current 29.0 Amps @ 120V / 15 Amps @ 240V DC Output N/A Frequency 60 Hz Coil Resistance (W+10%)   Run Time ~ 8.5 hrs at half rated load Noise Level 69.0 dB IGNITION SYSTEM:   Ignition System T.C.I (Transistor Controlled Ignition)