26 • DESERT RACER
Once you become familiar with driving your model, you might need
to make adjustments for better driving performance.
Adjusting Gear Mesh
Incorrect gear mesh is the most common cause of stripped spur
gears. Your Desert Racer makes improper gear mesh virtually
impossible. A pin system helps set the motor in the proper place
according to the pinion and spur gear that are selected.
To access the pin system,
remove the eight 3x15mm
coutersunk cap screws
from the bottom skidplate.
Remove the skidplate from
the chassis. Next, remove the
two 3x8mm button-head
cap screws that secure the
gear cover and remove the
gear cover. Remove the
three motor mount screws
(4x10mm button-head
cap screws (2), 4x25mm
button-head cap screw (1))
and lift off the motor. This
will expose the pin. Be sure
not to lose the pin that goes
between the motor and the
chassis.
Select the desired gearing
from the pin location chart.
Replace the spur and pinion
gears as needed. When
installing the motor, install
the pin into its proper
location based on the
gearing that is chosen. The
pin on the bottom helps
to lock the motor into the
proper place for correct
gear mesh. Secure the
motor in place with three
screws inserted into the
transmission housing.
Note:
Should you choose to do so, you can also set the gear mesh
manually without the pin. With the pin removed, use the 4x10mm
button-head cap screws (2) and 4x25mm button-head cap screw (1)
on the bottom to set gear mesh. Loosen the screws. Cut a narrow
strip of notebook paper and run it into the gear mesh. Slide the
motor and pinion gear into the spur gear. Tighten the screws, and
then remove the strip of paper. You should be able to run a fresh
strip of paper through the gears without binding them.
BASIC TUNING ADJUSTMENTS
Spur Gear
Pinion Gear
47-T
Part #8573
51-T
Part #8574
55-T
Part #8575
27-T
Part #5647
-
F
C
31-T
Part #5638
A
C
E
34-T
Part #5639
G
E
-
Pinion/Spur Pin Location
3x15mm
BCS
3x8mm BCS
4x25mm BCS
4x10mm BCS
