T-MAXX 3.3 OWNER’S MANUAL • 19
THE TRX 3.3 RACING ENGINE
Tank 2
1. From tank 2 forward, T-Maxx 3.3 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 13) on the
carburetor counterclockwise.
3. When the fuel tank is nearly empty, shut off the engine and refuel.
From here on, 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. T-Maxx 3.3 may try to shift
into second gear. If it does, reduce the throttle input. Do not let
T-Maxx 3.3 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 now 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
STOP!
Clean your air filter before you proceed.
Refer to the instructions
on page 15. During the sixth tank of fuel, the engine can be tuned
for general performance use. Proceed to the next section in this manual
(page 20).
Winter Break-in Tips
During the break-in process, the piston
and sleeve wear into each other to form a
precise fit. The engine needs to heat up to a
temperature around 200 to 215 degrees to
allow the piston and sleeve to achieve this
fit properly. A precise fit between these two
components is critical for proper compression,
and optimum performance. If the engine runs
too cold during break-in, the piston and sleeve will not expand to their
appropriate sizes for break-in, and this can lead to premature wear of
these components. This wear may not become apparent until after winter
has past, and the engine is operated under warmer running conditions.
• Warm the engine to approximately room temperature by removing
all fuel and storing the vehicle inside at room temperature until just
before starting the engine. An extremely cold engine can become
difficult to start.
• After the engine is running, it is important to keep the temperature of
the engine up around 200 to 215 degrees during break-in. In weather
below 45 degrees, the TRX 3.3 Racing Engine will tend to run at lower
temperatures between 160 to 180 degrees (when tuned at proper
break-in mixture settings). This is too cool for break-in. Do not lean the
fuel mixture to increase engine temperature! This will also decrease
lubrication and cause your piston/sleeve to wear prematurely.
• Wrap the cooling head with a paper towel, clean rag or sock to help
keep the engine running around the recommended 200 to 215 break-
in temp. If too much heat is contained, the engine can actually run too
hot. Make sure that you monitor the engine’s temp closely for the first
couple of tanks until you get the right amount of cover for the cooling
head. This will, of course, depend on your current weather conditions.
Adjusting the cover up and down, exposing more or fewer cooling fins,
is a convenient way to regulate engine temps.
• For owners that do not have access to a temperature probe, a drop of
water on the cooling head (around the glow plug area) should slowly
sizzle for approximately 6 to 8 seconds around 200 to 210 degrees. If the
water sizzles for only a few seconds, then it is likely that it is over 220
degrees, and needs to cool down. If the water takes a long time or does
not evaporate at all, then the engine is too cool.
• We do not recommend that you operate your engine below 35 degrees
Fahrenheit. If you insist on running your vehicle below 35 degrees,
be aware that nitro engines may be very difficult to start and tune at
extremely cold temperatures. Also, at temperatures below freezing, nitro
fuel can actually begin to gel up, and this can be harmful to the engine.
Follow the remaining break-in procedures as outlined in this Owners
Manual. This, along with the steps listed above, will ensure a good break-
in for your new nitro engine, and provide many hours of enjoyment.
TANK
THROTTLE
TIME
COOL
BODY
NOTES
1
1/4
2 seconds
15 minutes
Off
Apply throttle gradually.
2
1/2
2 seconds
15 minutes
On
Apply throttle gradually.
3
1/2
3 seconds
-
On
Reduce idle speed if necessary.
4
Full
3 seconds
-
On
Do not allow shifting to high gear.
5
Full
5 seconds
-
On
Accelerate over 3 second count, hold for 2 seconds.
High Altitude Operation: If you live in a high altitude region (5000
or more feet above sea level), the lower air density may require
you to lean your high-speed fuel mixture slightly from the factory
break in settings. Try this if you are experiencing difficult starting
or extremely sluggish engine performance at high altitude.
