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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
1
2
/
turns out
2
the break-in peri-
od, your engine
may appear to
malfunction with
symptoms such
as stalling,
inconsistent per-
formance, 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 throt-
tle can stall your
engine. Resist the
temptation to tune the
engine for performance
and/or run for extended
for High-Speed
Performance
times at wide open
throttle. Soon, after
about the fourth tank of
& Low Speed
fuel, your patience will
pay off with solid, con-
sistent, performance.
DURING BREAK IN...
• Special break-in fuels
are not required.
• Drive the model on a
smooth hard surface.
• If possible, avoid run-
ning 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.
THE FIRST TANK OF FUEL
• Drive the Nitro 4-Tec on a flat paved surface in an oval configu-
1) Check the wheels and steering for binding. Check the operation
of the shock absorbers.
2) Check the wiring for any frayed wires or loose connections,
including the wires on the EZ-Start quick connector. Fraying
or melting of the blue wire on your EZ Start system can
cause your glow plugs to immediately short out.
3) Check the tightness of the grub screws in the collars on the
throttle and steering linkages.
4) Check the air filter for proper mounting and filtration.
5) Check the mounting of the receiver and servos.
6) Check the tightness of the wheel nuts with a wrench.
Contact Traxxas for assistance: 1-888-TRAXXAS. 972-265-8000 (outside USA). E-Mail us at support@traxxas.com
2 turns out
High-Speed Power Loss
Overheating
LEAN
DANGER
RACING
Optimum
EVERYDAY
RUNNING
Optimum
for Climbing
SAFE RANGE
Operation
RICH
Sluggish Performance
Break-In Settings
ration. This will cause you to naturally vary your speed over the
entire RPM range. During this break in time, ease in and out of the
throttle slowly to avoid stalling the engine. The goal is to simply
keep the engine running.
• The fuel mixture setting may require slight adjustment to correct
for different altitudes and temperatures. To tell if the engine is running
rich (high volume of fuel flowing through the engine) look for the
following conditions:
1) The engine should accelerate sluggishly
2) There should be a thick trail of blue smoke coming
from the exhaust.
• If you do not observe the conditions above, then turn the high
speed needle out 15° (counterclockwise) and retest.
• Do not run at full speed during the first tank of fuel.
• Do not rev the engine with the wheels off the ground. High,
no-load RPMs can damage the engine, usually resulting in a
broken connecting rod. At the end of the first tank of fuel, stop
the engine and allow it to cool for 5-10 minutes before proceeding.
MAINTENANCE
7) Check the fuel tank and all hoses for signs of leaks.
8) Check the operation of the radio system, especially the
condition of the batteries.
9) Check the exhaust system for leaks, cracks, or tears. Do not
run the model if there are any exhaust leaks.
10) Use Traxxas Nitro Wash spray cleaner to keep the model
clean of accumulated dirt and oil. Do not spray any radio
components with Nitro Wash. Do not spray Nitro Wash into
a dirty air filter while it is installed on the engine.
11) The steering servo saver will wear out over time. If the
steering becomes loose, the servo saver should be replaced.
9
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