PRO-S Rev1104
12
Figure 4. Fuel Control Arm
Install Throttle Servomotor (Non-Electronic Engine
Only)
The throttle servomotor (FRC part number PRO-34M.) is used for engines that
do not have an electronic engine control system.
The throttle servomotor has a universal mounting flange with six mounting holes.
It should be mounted in a location where vibration and high temperatures will be
minimized.
Note: The throttle cable (or linkage rod) varies for each installation and is not
supplied with the throttle servomotor.
Minimize Engine Oscillation
It is important to note that in order to minimize engine oscillations the stroke at the
point the cable attaches to the fuel control arm should be 2 inches.
The length of the stroke at the point the cable attaches to the fuel control arm has a
direct effect on the sensitivity of the system. The shorter the stroke, the more sensitive
the system. Most engine oscillations occur because this stroke distance is too short.
To increase the stroke distance, increase the length of the fuel control arm.
Note: Extending the effective
length of the fuel control arm will
increase the stroke distance and
decrease the sensitivity of the
system.
Throttle
Cable
Typical Fuel
Control Arm
Shorter
Stroke
Longer Stroke
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