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STOP! The TRX 2.5 engine must be broken-in over 5 tanks of fuel before tuning for performance. The carburetor has been preset to the factory break in settings at the factory. Minor adjustments may be required to compensate for temperature and altitude. Engine should always show light trail of blue smoke from the exhaust. If theres no smoke or the engine stalls, richen H-spd needle 1/4 turn & proceed with break in. Pinch the fuel line to shut off the engine. STOP!
The TRX 2.5 engine must be broken-in over 5 tanks of fuel before
tuning for performance. The carburetor has been preset to the factory
break in settings at the factory. Minor adjustments may be required to
compensate for temperature and altitude. Engine should always show
light trail of blue smoke from the exhaust. If theres no smoke or the
engine stalls, richen H-spd needle 1/4 turn & proceed with break in.
Pinch the fuel line to shut off the engine.
Fuel
Use Traxxas Top Fuel for best performance and engine life. The TRX 2.5 is
optimized for 10-20% Nitro fuel. If you break-in your engine on 20% fuel
then use 20% fuel all of the time.
Starting Your Model
1. Turn on the radio system & range test
2. Engine must be at room temperature
3. Connect EZ-Start and press button.
Watch for fuel moving through the fuel
line up to carburetor.
4. If fuel isnt visible within 5 seconds,
prime by covering exhaust outlet for
1 or 2 seconds, just until fuel reaches
the carburetor
5. Engine should start and idle.
6. Proceed with break-in.
Tank 1 Throttle: 1/4 Time: 2 seconds Cool: 15 min. Body: Off
Apply throttle gradually
Tank 3 Throttle: 1/2 Time: 3 seconds Cool: None
Body: On
Reduce idle speed if necessary
Tank 4 Throttle: Full Time: 3 seconds Cool: None
Body: On
Dont allow shifts to high gear if 2-spd equipped
Tank 5 Throttle: Full Time: 5 seconds Cool: None
Body: On
Accelerate over 3 second count, hold for 2 sec.
Break-in Procedure
Tank 2 Throttle: 1/2 Time: 2 seconds Cool: 15 min. Body: On
Apply throttle gradually
Card supplied as a tuning aid. Read and follow all instructions in the Owners Manual Needle Settings for Performance
(T
urn needles counter
-c
lockwise to richen / c
lockwise to lean)

H-spd
-Lean 1/16 turn until no gain in performance then richen
needle 1/8 turn.
Stop immedia
tely if engine cuts out or loses po
wer
(Danger!),
richen 1/4 turn,
and re-tune.

Max Eng.
temp
- 270°F

L-spd
-Pinch fuel line after several high-speed runs.
Engine should
run for 2-3 seconds,
speed up,
then die.
Less than 2 seconds,
richen 1/8 turn.
More than 3 seconds,
lean 1/16 turn.

Idle adj.
- Once H and L-spd needles ha
ve been set,
reduce idle to
minimum reliable speed.
H-Spd Needle Corrections for W
eather Conditions
Higher humidity
set slightly leaner
Higher barometric pressure
set richer
Higher tempera
ture
set leaner
Higher altitude
set leaner
Higher nitro %
set richer
Routine Maintenance

After eac
h hour of running
1.
Clean and re-oil air filter
.
2.
Clean engine of dirt and oil.

After eac
h running session
(After
-run procedure)
1.
Empty tank.
2.
Start engine to burn off remaining fuel in engine.
3.
Clean engine and remove filter and glo
w plug.
4.
Spray 1-second burst
WD-40 into carburetor & glo
w plug hole.
5.
Spin engine with EZ-Start for 10 seconds (repea
t step 4 & 5 twice).
6.
Clean air filter and re-oil.
7.
Replace plug,
reconnect plug wire,
and reinstall filter
.
Driving the Model
1.
Dont run your model in wa
ter
,
mud,
sno
w or wet grass.
2.
Dont over
-rev the engine.
3.
Avoid extended periods of severe high-RPM running.
4.
Dont drive your model with dama
ged drive train.
5.
If engine cuts out or loses po
wer
,
STOP
,
richen H-spd 1/4 turn.
6.
Dont to
w an
ything with your model.
7.
Drive over large obstac
les a
t
an angle.
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