User Manual

6
The idle screw regulates the throttle opening to control the idle
speed. The throttle opening at idle should be set as shown in the
drawing. The opening should be 1 to 1
1
/
2
millimeters at the widest
point in the opening. The engine may not idle well until it is
warmed.
STEP 5: PRIME THE ENGINE
Connect the plug from the EZ-Start control box into the connector
mounted at the rear of the truck. The plug is keyed so it will only
insert one way.
Closely watch the fuel line going into the carburetor. Hold your
finger over the exhaust outlet and press the button on the EZ-
Start until the fuel moves through the fuel line towards the car-
buretor. Once fuel reaches the carburetor, STOP. If you press the
EZ start button too long, you will flood the engine and the EZ-
Start will not be able spin it over (see page 10). With a full tank
of fuel, it will only take a second to move the fuel up to the car-
buretor.
STEP 6: SHUT-
TING OFF THE
ENGINE
Before starting the engine it is important to know how to shut it
off. The correct method is to pinch and hold the carburetor’s fuel
line at idle speed, until the engine dies.
STEP 7: START THE ENGINE
Before starting your engine, review the safety and driving
precautions in this manual.
1) Tu rn the radio system on (transmitter then receiver). Place the
truck against a curb or some other immovable object to prevent
it from moving forward.
2) Press the start button on the EZ-Start to turn over the engine.
Do not hold for more than 5-10 seconds to start the engine.
Once the engine has started, it may be necessary to continue
to hold the start button to keep the plug lit until the engine
has warmed up.
Note: The red LED on the EZ-Start will light when the start
button is pressed. This indicates that the glow plug is hot
(ignited). If the LED does not light, make sure that the glow
plug connector (blue wire) is firmly attached to the glow plug.
If the connection is secure, and the LED still does not light,
replace the glow plug with a Traxxas, standard plug #3230.
3) If the engine did not start in step 2, prime it again and retry.
Continue this sequence until the engine starts.
BREAKING-IN THE ENGINE (VERY IMPORTANT!)
Once your engine is running, it must be broken-in. The key to
breaking in your engine is patience. The break in time will take
about 1 to 1
1
/
2
hours. During the break-in period, your engine
may appear to malfunction with symptoms such as stalling,
inconsistent performance, and fouled glow plugs. Don’t give up
on it! These are just “break-in pains” that every new engine has
to go through. They will disappear once you get through the
break in period. Just keep it running, and throttle on and off
as smoothly as you can. Sudden bursts or releases of the
throttle can stall your engine. Resist the temptation to tune the
engine for performance and/or run for extended times at wide
open throttle. Soon, after about the fourth tank of fuel, your
patience will pay off with solid, consistent, performance.
DURING BREAK IN...
• Special break-in fuels are not required.
• Drive the model on a smooth hard surface.
• If possible, avoid running on very hot, humid days.
• Run with the body off for extra engine cooling.
• Do not allow the fuel tank to run completely empty, possibly
leading to a burned plug. An extremely low fuel level causes
the fuel mixture to be too lean.
•Keep extra glow plugs handy. The break-in process, because
of the engine running rich, can cause deposits to form on the
glow plug, leading to failure.
•Turn the mixture screw (needle) clockwise (in) to lean the mix-
ture and counter-clockwise (out) to richen the mixture.
DRIVING PRECAUTIONS
• The radio system is not waterproof. Avoid driving through puddles,
wet grass, or mud. Water could damage the electronics.
• Do not continue to operate the Nitro Sport with low batteries. After
the battery power drops below a certain point, the model will
continue with the last command it had from the transmitter.
Indications of low battery power include slow operation and
sluggish servos. On the transmitter, a flashing red light indicates
low transmitter batteries.
• Do not drive the Nitro Sport at night, on public streets, or in
large crowds of people.
• If the truck becomes stuck, do not continue to run the engine.
Remove the obstruction before continuing to drive.
• Do not attempt to push or tow objects with the Nitro Sport.
• The model is controlled by radio. It is subject to radio interfer-
ence from many sources beyond your control. Since radio
interference can cause momentary losses of control, allow a
safety margin around the truck in order to prevent collisions.
• Use common sense whenever you are driving your model.
Intentionally driving in an abusive and rough manner will
only result in poor performance and broken parts.
Contact Traxxas for assistance: 1-888-TRAXXAS. 972-613-3300 (outside USA). E-Mail us at [e-mail]
CAUTION:
TRX ENGINES MUST BE BROKEN-IN FOR MAXIMUM LIFE
AND HIGHEST LEVEL OF PERFORMANCE. THIS PROCESS
MUST NOT BE SKIPPED. A SHORTCUT HERE COULD
SHORTEN THE ENGINE LIFE.
Watch closely
for the fuel to
stop at the inlet