Engine  -  Generators  -  Parts  -  Media  -  Our Mission  -  Contact Us

Advanced Technology


Economical OHV Engine

Kubota's own air-cooled, 4-cycle OHV engines achieve greater combustion efficiency by placing the valve over the cylinder rather than on the side. This way, air and fuel are mixed more thoroughly by travelling directly into the cylinder for greater thermal and fuel efficiency.


Longer Continuous Operation

The efficient OHV combustion system reduced fuel consumption by 25%. This, combined with a larger capacity fuel tank, results in a longer period of continuous operation on a single tank of fuel. The Auto Idler on AV3800 - AV6500B reduces fuel consumption even further.


Lower Noise Level

The noise levels have been reduced 3 to 7 dB (A) thanks to Kubota's unique sound absorbing design, the highly efficient OHV combustion system, precision engine parts, oversized engine silencers and air cleaners.


Stable Power Generation

Either the brushless Condenser Load Compensation (CLC) system or the brush type Automatic Voltage Regulator (AVR) system is used in the generator unit. Both systems ensure consistent output with very little voltage fluctuation.


Easy Dependable Starting

Engines used in this series are equipped with an automatic decompression system and an electronic ignition device. The combination of the automatic decompression system, which reduces the pulling force by 40% compared to conventional side valve engines, and the powerful electronic ignition device ensures dependable starting in any weather. Electric start models are also available for AV3800 - AV 6500B.


Economical & Safe Oil Supply

Reduced oil consumption contribute to economical operation. Kubota's OHV engines consume 50% less oil than comparable side valve engines. As a safety measure, the Oil Watch system automatically stops the engine before the oil reaches an unsafe level.


Dual AD/DC Power System

Even when AC power is in use, DC can supply enough power (120V/100W) to charge an automobile battery.


Convenient Operation

All connectors, indicators and controls are conveniently grouped for easy operation. Twist lock receptacles solved the problem of accidental cord unplugging, while the built-in circuit breakers/protectors provide additional safety for AC and DC circuits. Electric start models have an (optional) automatic choke and hour meter to help schedule preventive maintenances.


Model AV2500 AV3800 AV4500 AV5500(B) AV6500(B)
Frequency (Hz) 50
Max. output (kVA) 2.1 3.2 3.6 4.8 5.4
Rated output (kVA) 1.8 2.8 3.1 4.0 4.5
Number of phase Single
Voltage 220 240 220 240 220 240 220 240 220 240
Current (A) 8.2 7.5 12.7 11.7 14.1 12.9 18.2 16.7 20.5 18.8
Power factor (%) 100
Number of poles 2
Insulation class B
Excitation Self-excited type
Voltage compensation CLC AVR
Drive Direct
Over current protection AC--circuit breaker, DC--circuit protector
DC output (W) 120
DC voltage (V/A) 12/10
Type Air-cooled 4-cycle OHV gasoline engine
Number of cylinders 1
Bore x stroke (mm) 67 x 48 75 X 56 79 X 56 84.2 x 70
Displacement (cc) 169 247 274 389
Max. output (HP/rpm) 4.8/3000 7.0/3000 7.9/3000 11.1/3000
Rated output (HP/rpm) 3.9/3000 5.0/3000 5.5/3000 7.5/3000
Lubricating oil API type SE or SF class engine oil, below 14 degrees F: 5W20 or 5W30,from 0 degrees Fto 104 degrees F: 10W30 or 10W40
Oil capacity (L) 0.6 0.9 1.1
Cooling system Air-cooling
Fuel Regular automobile gasoline
Fuel tank capacity (L) 14 18 20
Capability in rated output (approx/hr) 12.5 11 10 8.5 7.5
Starting system Recoil Recoil
Battery capacity - 24Ah(32A19R)
Dimensions [LxWxH] (mm) 540 x 415 x 490 595 x 440 x 553 695 x 470 x 598
Total dry weight (kg) 46 65 68 83(89) 89(94)
Sound level during rated output at 7m (dBA) 70 71.5 72 74.5 75
*Injury can occur: Do not connect generator to an electrical system unless an isolation switch has been installed, otherwise injury can occur.
*The company reserves the right to change specifications without notice to incorporate technological advances and engineering modifications.
*Thermostat kit is required for operation below -10 degrees Celsius.

Engine  -  Generators  -  Parts  -  Media  -  Our Mission  -  Contact Us