GX240 • GX270 • GX340 • GX390 (UT2/RT2) Technical Manual
© 2010 American Honda Motor Co., Inc — All Rights Reserved 5
Output Confirmation Methods
Governor Rod Measurement
When the engine is properly matched and operating at
its continuous rated load, the carburetor throttle angle
should be approximately half way between full open
and full closed positions.
Bring the engine to normal operating temperature and
then apply the expected continuous load. If the throttle
is more than halfway open, the engine is being
overloaded resulting in overheating and shortened
engine life.
Tachometer RPM Measurement
Normal governor droop can also be used to measure engine load.
At rated speed:
Engine is operating within the continuous recommended power range.
COOLING
Minimum Cooling Air Flow Requirement
Engine enclosure must have the minimum cooling air flow listed below.
GX240/GX270: 7 m
3
(247 ft
3
) per minute at 3,600 rpm
GX340/GX390: 8 m
3
(282 ft
3
) per minute at 3,600 rpm
Ambient Temperature Limits
-15 to +40°C (+5 to +104°F)
Testing
• Use thermocouple temperature probes at the specified locations.
• Operate the engine under worst-case conditions
• An electronic data logger is required for the temperature data collection
• Set up the data logger to take multiple readings per minute. If data is being taken manually, a reading every 5
minutes is adequate.
• Take readings until the engine oil temperature is stabilized at continuous rated load
• Run the application for one hour of continuous operation; the temperatures should be stabilized in that time. If the
application is used only for short intervals, note the normal run time in the application document.
• Shut the engine down and continue to take readings. Attempt to restart the engine after heat soaking for 5 minutes.
• For enclosed applications, fuel bowl temperature should be monitored after testing until the maximum is reached -
this may take several minutes
rpm with load
rpm without load
1-
()
100% ≤ 5%
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