Honda G100K2 Applications Manual page 22

GOVERNOR PERFORMANCE
The governor is usually associated with controlling the engine speed, but it also effects the available power
output of the engine.
For this reason, the effect of the governor control must also be considered in the application of the engine.
Curve A shows a typical governor performance curve. Engine speed at no-load starts at 3100 min
When the load is applied, engine speed drops and reaches 2900 min
This is a typical close regulation curve with an engine speed drop of 200 min
require a closer regulation.
As you obtain closer regulation and a more sensitive governor, it tends to become unstable.
Much of the powered equipment that has rapidly changing load, and is subject to bouncing around, can not
tolerate very close governing, as the speed surges (hunts) too much.
For this case, more stable governing (wider regulation) is generally preferred.
Curve B shows a wide regulation governor curve. Engine speed at no-load starts at 3000 min
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2700 min when load is applied. The wide regulation curve shows less power available, about 11% less power
compared to the close regulation.
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For 50 Hz (3000 min )
For 60 Hz (3600 min
Governor arm
Governor spring
A weaker spring or a hook position closer to the governor shaft makes the governor operation more "close
regulated".
A stronger spring or a spring hook position further from the governor arm makes the governor operation more
"wide regulated".
Wide open throttle:
power curve
Wide
regulation
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)
For 60 Hz (3600 min
- 21 -
Close
regulation
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where full power is delivered.
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; a generator set may
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For 50 Hz (3000 min )
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)
Governor spring
POWER OUTPUT
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and drops at
Governor arm