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The TRX 2.5 Racing Engine
33
As you gain
experience in the
hobby, you may
discover that many people
have differing opinions on
what is the proper
procedure to break-in a
model engine.
Only use the
Traxxas break-in procedure.
Other break-in procedures
could result in a weak,
damaged, or otherwise poor
performing engine.
The
procedure outlined here
was extensively tested and
proven to yield better
performing engines than
other “common” break-in
methods. Even if you have
years of experience using
model engines, please do
not ignore this caution!
Tank 1
1. Drive the model with the body off.
2. Driving procedure:Gently pull the throttle trigger to 1/4
throttle over a 2-second count. Then gently apply the brake to
stop.Count the two seconds out while accelerating:one
thousand one,one thousand two, and then stop.Operate the
throttle trigger as smoothly as you can.Repeat this starting and
stopping procedure until the first tank of fuel is nearly empty.
3. Look for thick blue smoke exiting the exhaust outlet. If there is
no smoke,richen the high-speed needle 1/4 turn, by turning the
needle counterclockwise.
4. When the fuel tank is nearly empty,shut off the engine by
pinching the fuel line connected to the carburetor.
5. Let the engine cool for 15 minutes.
Note: If at any point the engine cuts out or stalls during gentle
acceleration,richen the high-speed needle 1/4 turn by turning the
needle counterclockwise.
Tank 2
1. From tank 2 forward,the T-Maxx should be driven with the
body on.
2. Driving procedure:Gently pull the throttle trigger to 1/2
throttle over a 2-second count. Then gently apply the brake to
stop. Count the two seconds out while accelerating: one
thousand one,one thousand two, and then stop.Repeat this
starting and stopping procedure until the second tank of fuel
is nearly empty.
3. When the fuel tank is nearly empty,shut off the engine and let it
cool for 15 minutes.
Tank 3
1. Driving procedure:Gently pull the throttle trigger to 1/2
throttle over a 3-second count. Then gently apply the brake
to stop. Count the three seconds out while accelerating:one
thousand one,one thousand two, one thousand three,
and then stop.Repeat this starting and stopping
procedure until the third tank of fuel is nearly empty.
2. As the engine loosens,the idle speed may increase
and cause the model to try to creep forward when
stopped. Reduce the idle speed by turning the idle
adjustment (see page 22) on the carburetor
counterclockwise.
3. When the fuel tank is nearly empty,shut off the engine and
refuel.From here on out,you do not need to let the engine cool
between tanks.
Tank 4
1. Driving procedure:Gently pull the throttle trigger to full
throttle over a 3-second count. Then gently apply the brake to
stop. Count the three seconds out while accelerating:one
thousand one,one thousand two, one thousand three,and then
stop.Repeat this starting and stopping procedure until the
fourth tank of fuel is nearly empty.
2. Apply the throttle gradually! Your finger should not reach full
throttle until the end of the three-second count.The T-Maxx may
try to shift into second gear. If it does,reduce the throttle input.
Do not let the T-Maxx shift out of first gear.
3. Keep your driving smooth and consistent.
4. When the fuel tank is nearly empty,shut off the engine and
refuel.
Tank 5
1. Driving procedure:Gently pull the throttle trigger to full
throttle over a 3-second count, hold for 2 more seconds, and
then gently apply the brake to stop. Count the five seconds out
while accelerating.Repeat this starting and stopping
procedure until the fifth tank of fuel is nearly empty.
2. The model should be shifting into second gear. If it is not, try
turning the high-speed needle clockwise 1/8 turn to lean the
fuel mixture slightly and test for shifting.
3. When the fuel tank is nearly empty,shut off the engine and
refuel.
Tank 6
During the sixth tank of fuel, the engine can be tuned for general
performance use.Proceed to the next section in this manual.
Tank
1
2
3
4
5
Throttle
1/4
1/2
1/2
Full
Full
Time
2 Seconds
2 Seconds
3 Seconds
3 Seconds
5 Seconds
Cool
15 Minutes
15 Minutes
-
-
-
Body
Off
On
On
On
On
Notes
Apply throttle gradually.
Apply throttle gradually.
Reduce idle speed if necessary.
Do not allow shifting to high gear.
Accelerate over 3 second count,
hold for 2 seconds.