Traxxas NITRO SLASH Manual page 21

Tuning the engine means finding the
Lean
perfect balance between the two;
excellent power to meet your needs
while maintaining good lubrication
for long engine life. The optimal fuel
mixture setting is rich to provide a
safety margin against having a lean
condition if some variable changes
(such as the temperature from one
day to the next).
Rich
General fuel mixture settings are
measured by the number of turns
the needles are turned out from fully
closed. The fuel mixture settings
have been pre-set from the factory
to typical break-in settings. Do
not readjust your carburetor from
the factory settings until after the
engine is started and running, and
you have been able to observe the
engine running to assess what minor adjustments may be required
to compensate for fuel, temperature, and altitude. Adjustments are
usually made in 1/8 or 1/16-turn increments. If the engine sticks at top
dead center (TDC), see page 33 for instructions on freeing the engine.
The Idle Speed Adjustment Screw
The idle speed adjustment screw controls the closed position of the
throttle slide. When the throttle servo is in its neutral position, the
throttle slide should be stopped against the idle speed adjustment
screw. Always use the idle speed adjustment screw to control engine
idle. See page 27 for instructions on adjusting the idle speed.
EZ-START ELECTRIC STARTING SYSTEM
The Traxxas EZ-Start brings the convenience of push-button electric
engine starting to your model. The EZ-Start consists of a hand-held
control unit and an on-board motorized starter.
• Power for the EZ-Start system comes from a 7.2-volt rechargeable
battery pack installed in the hand-held control unit.
• The engine glow plug is heated automatically by the EZ-Start
system, eliminating the need to keep up with a separate glow plug
igniter.
THE TRX 3.3 RACING ENGINE
• The voltage to the glow plug is kept constant, regardless of the load
placed on the starter by the starter motor.
• The "Glow Plug" LED (light emitting diode) on the control unit
indicates the condition of the glow plug.
• The "Motor" LED indicates the status of the EZ-Start electric starter motor.
• The cush drive mechanism in the drive unit prevents damage to the
gears caused by engine kickback.
• Smart Start ™ protection circuitry prevents damage to the motor by
cutting power if the load on the motor or other
electronics exceeds safe limits.
Charging the EZ-Start Battery
The included charger can be used to charge
the included EZ-Start battery pack. Do not
charge batteries inside of an automobile. Read
the Safety Precautions section of this guide.
1. Plug the charger into a 12-volt
automotive auxiliary power socket.
The charger is compatible with 12-volt
automotive auxiliary power sockets only.
The LED on the charger will glow red to
indicate it is ready to charge a battery.
2. Connect the battery to begin charging.
Plug the battery into the charger.
The charger's LED will
CHARGE PROGRESS
flash green, indicating
x1
that charging has begun.
1 green flash
The flashing green LED
x2
2 green flashes
on the charger indicates
x3
3 green flashes
the charge progress.
x4
4 green flashes
3. Disconnect the battery
Solid green LED
when charging is
complete. When the battery is fully charged, the LED will light solid
green. The battery will be warm in your hand. Disconnect
the battery.
CHARGER LED INDICATION MEANING
Solid Red LED Ready for Charging
Slowly Flashing Green LED Charging (see Charge Progress chart)
Solid Green LED Battery Fully Charged
Flashing Red LED Charger error
Note: If there is a problem with the battery, such as a short circuit, the charger's LED will flash red. Disconnect
the battery and unplug the charger from its power source to clear the error. Determine the cause of the error
before continuing.
See Tuning Your TRX 3.3
Racing Engine on page 25
for complete information on
adjusting the air/fuel mixture
and idle speed.
Factory Needle Settings
If your factory preset
carburetor adjustments have
1 1 been tampered with, use the
following settings:
• Set the high-speed needle to
4 turns out from closed.
• Set the low-speed needle so
Disconnected
the screw head (red in Fig. A)
2 2
is flush (even) with the end
of the slide (yellow in Fig. A).
Connected
3 3
Always use the factory
Charged
settings for initial starting.
Only use these settings when
0 - 25% charged
the factory settings have
25% - 50% charged
been lost.
50% - 75% charged
75% or more charged
Higher nitro requires a richer
100% charged fuel mixture. When running
33% fuel, richen your high-
speed needle 3/4 turn if
previously running 20% nitro
and then re-tune the engine
for maximum performance.
2 2
Fig. A
Low-Speed
Needle Adjustment
NITRO SLASH • 21