Breaking In Your Trx 3.3 Racing Engine; Starting Your Trx 3.3 Racing Engine For The First Time - Traxxas Revo 3.3 5309 Owner's Manual

The TRX 3.3 Racing Engine

Breaking in Your TRX 3.3 Racing Engine

The TRX 3.3 Racing Engine uses a ringless, aluminum-brass-chrome (ABC)
See Important Points to
piston/sleeve construction. This type of engine design relies on a very
Remember on page 4 for
precise running fit between the piston and sleeve for cylinder sealing.
other precautions.
Engine break-in is necessary to allow the piston and sleeve to develop
an extremely precise fit and optimum cylinder sealing. Therefore,
Never run your Revo
proper engine break-in is critical to achieving the fastest, most reliable
indoors. Since the TRX 3.3
engine performance.
Racing Engine exhaust
fumes are harmful, always
Allow yourself about 1 to 1
run your model outdoors, in
The engine break-in period will take 5 tanks of fuel in a Revo. The break-
a well-ventilated area.
in time is not the time to impress your friends with your new Revo. You
must wait until the engine is fully broken in before attempting
Your TRX 3.3 Racing Engine
sustained high speed running. Patience and careful attention during
doesn't usually require
break-in will reward you with the best-performing TRX 3.3 Racing Engine
priming. If you do need to
possible.
prime your engine, watch
During break-in, your engine may appear to malfunction with symptoms
the fuel line carefully to
avoid flooding your engine.
like stalling, inconsistent performance, and fouled glow plugs. These are
See page 44 for information
simply the normal "break-in pains" engines sometimes go through. They
on clearing a flooded engine.
will disappear once your engine is fully broken in. Many owners report
not experiencing any of these symptoms with TRX Racing Engines. We
Factory Needle Settings: recommend to go ahead and replace the glow plug with a new one
Your carburetor is preset at
after the engine break in procedure.
the factory to give the
Engine Break-in Procedure
correct air-to-fuel ratio and
idle speed for engine break-
The focus during break-in is to vary and limit the engine speed. This will
in. Do not adjust the
be accomplished by accelerating and stopping at different rates for the
carburetor unless you
first 5 tanks of fuel. As the engine begins to break-in, the duration and
observe a poor running
intensity of the acceleration will gradually increase. Sustained high-
condition that requires
speed running is not permitted until the 6th tank of fuel. Perform the
correction (see page 25 for
initial break-in on a large, flat, paved surface. Revo is very fast and by
stock settings).
tanks 4 and 5 you will need plenty of room for the truck to run in.
Apply all throttle and braking actions gently. Abrupt acceleration or
Higher nitro requires a
braking could cause the engine to stall unnecessarily.
richer 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. See page 22
for more information.
28 • Revo 3.3
1 / hours to complete the break-in procedure.
2
Special break-in fuels are not recommended. Use the same fuel you
plan to use everyday.
If possible, avoid breaking-in the engine on extremely hot or cold days
(see page 30).
Pay careful attention to the fuel level. Do not allow the fuel tank to run
completely empty. An extremely low fuel level causes the mixture to
run too lean. This could result in a burned glow plug or extremely high
engine temperatures.
Do not attempt to break in the TRX 3.3 Racing Engine by idling it on a
stand. This will produce poor results.
Keep extra Traxxas glow plugs handy. The break-in process can cause
deposits to form on the plug leading to plug failure.
Change or clean your air filter after break-in.
Follow the instructions exactly for each of the first 5 tanks of fuel.

Starting Your TRX 3.3 Racing Engine for the First Time

Before you start your TRX 3.3 Racing Engine for the first time, make sure
you have read all instructions and precautions in this manual. Pay close
attention to the tank-by-tank break-in instructions in the next section,
and make sure you have read and understood them before you run
your engine.
Your engine must be at room temperature (70°F or 21° C) or above the
first time you start it. If it's cooler than room temperature outside, remove
all fuel and keep your Revo indoors until you're ready to start it and then
take it outside. If it's colder than 45 degrees, special considerations should
be made. See cold weather break-in on page 30. We do not recommend
running the model in temperatures below 35 degrees.
1. Turn on the radio system (see page 16).
2. Make sure the throttle trigger on the
transmitter is in the idle (neutral) position.
3. Connect the EZ-Start controller according to
the instructions on page 27.
4. Press the starter button in short two second
bursts and watch for fuel moving through the
fuel line up to the carburetor. Watch closely!
The fuel moves very fast. If the fuel doesn't
move through the line within 5 seconds, prime the engine by briefly
(one or two seconds) covering the exhaust outlet with your finger until
the fuel is just visible in the carburetor fuel line. Watch carefully! If the
engine is primed too long, it will flood with fuel and stop turning.
5. Once fuel reaches the carburetor, the engine should
quickly start and idle.
6. Disconnect the EZ-Start controller from the model.
7. Proceed with the engine break-in.
8. Do not rev your engine with no load (wheels off the ground).
If your engine doesn't start, go online to www.traxxas.com/support. If your
factory fuel mixture settings have been altered, refer to page 25. If you still
have problems, contact Traxxas Customer Support at 1-888-TRAXXAS or
support@traxxas.com.