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Gearing Compatibility Chart:
The chart below shows
recommended gear combination
ranges for your model.
Spur Gear
50
52
54
9
15.83
16.47
17.10
10
14.25
14.82
15.39
11
12.95
13.47
13.99
12
11.88
12.35
12.83
13
10.96
11.40
11.84
14
10.18
10.59
10.99
15
9.50
9.88
10.26
16
8.91
9.26
9.62
17
8.38
8.72
9.05
18
7.92
8.23
8.55
19
7.50
7.80
8.10
20
7.13
7.41
7.70
Out of box setup, recommended for most
running, 6 or 7-cell NiMH, 2s LiPo
High speed running on smooth hard surfaces,
6- or 7-cell NiMH or 2s LiPo
Preferred gearing for off-road and extreme
terrain driving
Fits, not recommended
24 • RUSTLER 4X4
ADJUSTING YOUR MODEL
Centering Your Servo
If the trim controls on your transmitter seem off, you may need to
re-center your servo. Additionally, whenever your servo has been
removed for service or cleaning, it must be re-centered prior to
installation in the model.
1. Disconnect 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.
3. Place fresh "AA" batteries in the transmitter and turn the
transmitter power switch on.
4. Turn the steering trim adjustment on the transmitter 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 18). The servo's output shaft will automatically jump
to its center position.
7. Turn off the power to the model followed by the transmitter. The
servo horn is now ready to be installed. Be careful not to move
the servo shaft when installing the servo horn.
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.
Motors and Gearing
One of the more significant advantages to your model's
transmission is the extremely wide range of available gear ratios. It
can be geared low enough to run extremely hot, modified motors.
Modified motors should be geared lower (higher numerically) than
stock motors because they reach their maximum power at higher
RPM's. A modified motor that is geared incorrectly can actually be
slower than a correctly-geared, stock motor. Use the following
formula to calculate the overall ratio for combinations not listed on
the gear chart:
# Spur Gear Teeth
x 2.84 = Final Gear Ratio
# Pinion Gear Teeth
If you are worried that you might be over-geared, check the
temperature of the battery pack and motor. If the battery is extremely
hot, and/or the motor is too hot to touch, your model is probably
over-geared. If you are not able to run your model for at least four
minutes before the battery dies, then change to a lower gear ratio.
This temperature test assumes that the model is close to factory stock
weight and operates freely with no excessive friction, dragging, or
binding, and the battery is fully charged and in good condition.
The model is equipped with a BL-2s 3300kV motor. The gear
combination that comes stock on each model provides good overall
acceleration and top speed. If you want more top speed and less
acceleration, install the optional high-speed gearing (more teeth;
sold separately). The optional high-speed gearing is intended for
high-speed running on hard surfaces, and is not recommended for
off-road or repetitive starting and stopping.
The BL-2s 3300kV motor is equipped with an integrated cooling
fan that is effective during medium to high-speed operation. The
gearbox is specially vented to cool the motor. Repetitive starting
and stopping over short distances creates excess heat and will not
allow the fan to cool the motor properly. For this type of driving,
smaller pinion gears are recommended to reduce load on the motor.
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 28 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.)
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