GX240 • GX270 • GX340 • GX390 (UT2/RT2) Technical Manual
2 © 2010 American Honda Motor Co., Inc — All Rights Reserved
INTRODUCTION
Honda engines are designed for minimal maintenance.
When maintenance is required, the task is kept simple by
providing convenient maintenance access and procedures.
Honda engines use proven engine technology and design
innovations to make them highly reliable engines.
DESIGN FEATURES
High Performance
OHV design reduces thermal distortion of the cylinder. This
helps maintain the optimum seal between the piston rings
and cylinder, which minimizes oil and fuel consumption.
Power is also maintained in extreme operating conditions.
Smooth and Quiet Operation
OHV design provides a reduced reciprocating mass and
balanced weight distribution. The 25° inclined cylinder
produces a low center of gravity for the moving parts, which
further reduces vibration for quiet operation. These features,
and the compact design result in extremely smooth
operation.
Use of proven design technologies reduces noise from
internal engine components. The hardness of reciprocating
parts, the helical cut gears on the crankshaft and camshaft
and the use of select materials makes these engines
exceptionally quiet. The large muffler is designed to further
reduce noise.
Durability/Reliability
Honda engines are built with quality that provides proven
durability and reliability. Proven features such as OHV
design and cast iron cylinder sleeve provide long life in all
types of operating conditions. To further enhance the
reliability of these engines, a 2-stage air cleaner system,
digital electronic ignition system, mechanical centrifugal
governor and proven side-draft carburetor are standard
features.
EMISSION REGULATIONS
The Honda GX390 engines meet U.S. Environmental
Protection Agency and the California Air Resources Board
regulations.
Honda engine distributors and equipment manufacturers
that use Honda engines are required by regulation to follow
this OEM technical manual. Correct engine matching
ensures that the engine will be durable (and emission
durable) in use.
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