User Manual

9
• CHANGING THE CLUTCH BELL AND SPUR GEARS
CENTERING YOUR SERVOS
Whenever your radio system has been removed for service or
cleaning, the servos must be re-centered prior to installing the
radio system in the model. If the radio system is installed in the
truck, disconnect the servo horns from the servos.
Connect the steering servo to channel 1 on your receiver and
the throttle servo to channel 2. The white wire on each servo
cable is positioned towards the crystal. Connect the red and
black cable from the battery holder to the “batt” terminal on the
receiver. The red wire is positive and the black wire is negative.
Place fresh “AA” batteries in the transmitter and turn the power
switch on. Slide the throttle and steering trim adjustments to to
the center position. Now install fresh “AA” batteries into the bat-
tery holder and turn the power switch to the on position. The ser-
vos will automatically jump to their center positions.
Tu rn off the battery holder switch followed by the transmitter.
The servos are now ready to be installed. Be careful not to move
the servo shaft when reinstalling the servo horns.
STORAGE
After running your Nitro Sport, use a good “after-run” product
prior to storage. The chemicals used in the fuel attract moisture
and can cause moisture and corrosion to form inside the engine.
Drain the fuel tank, start the engine and run it until all of the
remaining fuel is completely used up. Remove the air cleaner
and place the recommended number of drops (usually 6 drops)
of the after-run oil into the carburetor. Now, spin the engine for 2-3
seconds with the EZ-Start to circulate the oil. Replace the air
cleaner. Never store your model with unused fuel in it.
INSTALLING A RADIO SYSTEM (Model 4504)
Before installing the radio system center your servos as
described in your radio system’s operating instructions. Note: the
plug on the Traxxas 4-cell battery holder is compatible with
Traxxas and Futaba radio systems. Some Airtronics, Sanwa,
and Novak receivers require that the positive and negative
leads in the plug be reversed. Refer to your radio system’s
schematic to ensure that the polarity is correct.
The splines inside the steering servo saver and the throttle
servo arm are compatible with Traxxas and Futaba servos. Other
brands of servos may not fit properly and require you to pur-
chase a compatible servo saver and servo arm. The designs are
an industry standard so it should not be difficult to locate identi-
cal parts that will fit your servos.
Install the radio system components and hook up the linkages
as shown in the drawings on the right. Route your wires neatly to
prevent them from being damaged.
Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [e-mail]
Remove the rubber exhaust pipe
and the tuned pipe. Remove the
electric starter drive. Loosen the
four 3x8mm caphead screws which
hold the slotted adjusting plates to
the engine mount.
Remove the 4mm nylon locknut
and the spring from the spur gear.
Remove the spur gear from the
shaft.
Remove the large E-clip on the
clutch shaft and the clutch bell
gear. Remove the ball bearings
and install them in the new clutch
bell gear. Reinstall the clutch bell
gear and E-clip. Note: Smaller
clutch bell gears use smaller ball
bearings. Refer to your parts list for
the correct bearings. Reinstall the
spur gear on the top shaft and
secure it with the 4mm locknut.
Slide a strip of thin note paper
between the spur gear and the
clutch bell gear. Push the clutch
bell gear against the spur gear and
tighten the 3x8mm adjusting plate
screws. Remove the paper and the
gear mesh should be correctly
adjusted.