Traxxas Fiesta ST Rally Owner's Manual page 25

Centering Your Servo
If you have removed the servo horn from your model's steering servo,
or the servo has been removed for service or cleaning, the servo must
be re-centered prior to installation of the servo horn or installation of
the servo in the model.
1. Remove the servo horn from the steering servo.
2. Connect the steering servo to channel 1 on the receiver. Connect
the electronic speed control (ESC) to channel 2. The white wire on
the servo lead is positioned toward the receiver's LED.
3. Place fresh "AA" batteries in the transmitter and turn the
transmitter power switch on.
4. Turn the transmitter's steering trim knob to the center "0" position.
5. Disconnect the motor wires (see page 12) to prevent the motor
from turning during the next steps.
6. Connect a fresh battery pack to the speed control and turn on the
ESC (see page 19). The servo's output shaft will automatically jump
to its center position.
7. Install the servo horn onto the servo output shaft. The servo horn
should face toward the center of the chassis and be perpendicular
to the servo body.
8. Check servo operation by turning the steering wheel back and
forth to ensure that the mechanism has been centered properly
and you have equal throw in both directions. Use the transmitter's
steering trim knob to fine-tune the position of the servo horn so
the model tracks straight when the steering wheel is at neutral.
Adjusting the Slipper Clutch
The model is equipped with an adjustable slipper clutch, which is
built into the large spur gear. The purpose of the slipper clutch is to
regulate the amount of power sent to the wheels to prevent tire spin.
When it slips, the slipper clutch makes a high-pitch, whining noise. To
adjust the slipper, remove the slipper gear assembly from your model
(see page 27 for instructions), and turn the adjusting nut clockwise
to tighten or counterclockwise to loosen. Adjust the slipper so that
you can hear it slip for a moment from a standing, full throttle start.
(Learn more about adjusting the slipper clutch in the sidebar.)
basic tuning adjustments
Wheels and Tires
Many types of aftermarket tires and wheels can be adapted for use
on your model. Most will affect the overall width and the suspension
geometry of the model. The offsets and dimensions designed
into the model's wheels are intentional; therefore, Traxxas cannot
recommend the use of other non-Traxxas wheels with different
specifications. The diameter of the wheels is an innovative design,
and there is a variety of different tires available for you to experiment
with in addition to the included tires on the model (listed in
your parts list). Experimentation with different types of tires is
recommended to see which ones work the best on the terrain where
the model is run. When selecting tires, consider the overall diameter
and the rubber compound (hard or soft). If the overall diameter
of the tire is significantly increased, you will need to use a smaller
pinion gear to compensate for the larger tire. Soft compound tires
with many short spikes generally work better on hard, dry surfaces.
In loose dirt, a tire with large spikes should perform better. See your
parts list for accessory wheels and tires.
To achieve a good starting
point for the slipper clutch
in this model, remove the
slipper gear assembly from
your model (see page 27 for
instructions) and tighten the
slipper clutch adjusting nut
clockwise until the slipper
clutch adjusting spring
fully collapses (do not over
tighten), and then turn the
slipper clutch nut counter-
clockwise one full turn.
Do not run your model with
the slipper clutch adjusting
spring fully compressed. The
minimum recommended
slipper clutch setting is 1/2
turn counter-clockwise from
fully compressed.
FIESTA ST RALLY VXL • 25