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The Kubota OHV System Provides Economical Operation
The side valve system, used in conventional, multipurpose air-cooled gasoline engines, produces a considerable amount of heat loss with low compression ratios which result in poor combustion efficiency. The overhead valve suystem used in the Kubota Super OHV Series solves these problems, providing a high thermal efficiency and much better combustion than a side valve system. As a result, the Kubota Super OHV Series is highly economical, with 25% less fuel consumption and about half the lubricating oil consumption of a side valve engine.

Durability and Reliability
Kubota engines are designed for heavy-duty perdformance with an extrmemly rigid engine construction. A variety of innovative measures have been introduced with careful attention to every detail. For example, these engines are equipped with a dust and corrosion-proof carburetor and aluminum jets, as well as chrome-plated piston rings, a trouble-free breakerless ignition and other high quality components to ensure excellent durability and reliability. As a result, even when operated continuously for extended periods of time, there is no increase in oil consumption.

Low Vibration
Numerous technological improvements have been implemented to reduce vibration. The high horsepower GH400 features a twin-shaft balancer as standard equipment, and a single-shaft balancer is standard equipment on the GH340, which substantially reduces the amount of vibration.

Lightweight and Compact
Kubota technology has made it possible for an engine to weigh approximately 2.8 kg per horsepower--a 14% reduction from previous engines. The size is also approximately 23% less than a comparable side-valve engine.

Less Operating Noise
The OHV system produces 2 to 3 dB (A) less operating noise than a side valve engine.

A Decompression Mechanism that Provides Easier Starting
The Kubota Super OHV Series Engines are equipped with a mechanical decompression mechanism. During starting, a spring in the decompression pin raises the exhaust tappet and opens the exhaust valve slightly, lowering the pressure inside the combustion chamber. While running the engine uses centrifugal force to lower the decompresion pin. This unique decompression mechanism reduces the amount for force required to pull the starter rope by 40%. An electric starter is also available on the GH400.

Reduction system: direct coupling, or 1/2 camshaft reduction.

Specifications
Spec sheet

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