6
STEP 4: SETTING THE IDLE SPEED
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. Note: the engine may not idle well until it is
warmed.
STEP 5: LOW SPEED MIXTURE SETTING
This screw meters the fuel at low speeds. The low-speed mixture
screw is located in the end of the carburetor, inside the throttle
arm. This screw controls how much fuel enters the engine at idle
and low throttle. This adjustment will smooth the idle and improve
acceleration to mid-speed. Make this adjustment with the throttle
closed, after setting the idle. To get the low speed mixture into the
correct range of adjustment, turn it in or out until the head of the
screw is flush (even) with the end of the throttle arm assembly. This
will be the starting point for future adjustments. Fine tuning the
low speed mixture is described on page 7.
STEP 6: PRIME THE ENGINE
Press the primer button (built into the fuel tank) several times
until the fuel moves through the fuel line towards the carburetor.
Be sure to watch the fuel line going into the carburetor closely to
see when the fuel reaches the carburetor. Once it reaches the
carburetor, press the primer button
one
more time. If you press
the primer button too many times, you will flood the engine and
the EZ-Start will not be able spin it over (see page 10).
STEP 7: SHUTTING 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 8: START THE ENGINE
Before starting your engine, review the safety and driving
precautions in this manual.
1)
Turn 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)
Connect the plug from the EZ-Start control box into the connec-
tor mounted at the rear of the truck. The plug is keyed so it will
only insert one way. 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 but-
ton is pressed. This indicates that the glow plug is hot (ignit-
ed). 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, press the primer button 3
times 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.
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 Stampede 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 Stampede 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 Stampede.
• 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.
Primer Button
Contact Traxxas for assistance: 1-888-TRAXXAS.
972-265-8000
(outside USA). E-Mail us at
[email protected] [email protected]
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.
