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Denatured alcohol (available
from home centers and
paint supply stores) in a
spray bottle is an extremely
effective cleaner. Be sure
to wear safety glasses and
gloves when working with
denatured alcohol.
Be sure to follow proper
maintenance and storage
procedures to avoid damage
to your engine and other
components of your Nitro
4-Tec.
Don't put the fuel from your
tank back into your fuel
jug. Dispose of it properly,
following city or county
regulations.
Always wear eye protection
when using compressed
air or spray cleaners and
lubricants.
34 • NITRO 4-TEC 3.3
MAINTAINING AND STORING YOUR NITRO 4-TEC
7. Connect the EZ-Start controller to the model and spin the engine for
10 seconds.
8. Remove the rag or paper towel and repeat steps 5–7 two more times.
9. Clean and re-oil the air filter so it will be ready for use next time. See
page 19 for air filter maintenance instructions.
10. Replace the glow plug, reconnect the glow plug power wire, and
reinstall the air filter.
Clearing a Flooded Engine
If the engine is primed for too long during startup, then it can become
flooded with fuel. When the engine is flooded it will no longer turn due to
excess fuel in the combustion chamber preventing upward movement of
the piston. Use the following procedure to clear a flooded engine:
1. Remove the blue glow plug wire.
2. Remove the glow plug and gasket with the glow plug wrench supplied
with your model. A 5/16 or 8mm nut driver will also work.
3. Turn the model upside down and plug in the EZ-Start controller.
4. Push the EZ-Start button for several seconds to clear the engine
of excess fuel. Do not look into the glow plug hole while the
engine is spinning or you could spray fuel into your face!
5. Turn the model over and reinstall the glow plug and gasket.
6. Reconnect the blue glow plug wire to the glow plug.
7. Reconnect the EZ-Start controller.
8. Do not prime the engine. Pull the throttle to 1/2 throttle and push the
EZ-Start button. The engine should start immediately.
Piston stuck at "top dead center" (TDC)
"Top dead center" is the position where the piston is at the very top of
the tapered sleeve. Occasionally an engine can get "stuck" at this position.
This is most likely to happen on new engines during break-in, but can
also happen at other times. If the engine is stuck at TDC, use the following
procedure to release the piston from the sleeve:
1. Remove the glow plug using the included tool
or 8mm (5/16") nut driver and verify that the
piston is at the top of its stroke.
2. Turn the Nitro 4-Tec over and locate the
flywheel through the cutout in the chassis.
Insert a flat blade screwdriver as shown
between the chassis and flywheel. Using
the chassis for leverage, rotate the flywheel
counterclockwise by pressing down on the
screwdriver. The flywheel will turn, unsticking the
piston from the sleeve.
3. Put two or three drops of light machine oil into
the glow plug hole to lubricate the piston and
sleeve. Do not use too much oil. Excess oil will
hydro-lock the engine. Verify the starter will spin
the engine with the glow plug out.
4. Rotate the flywheel so the piston is at bottom
dead center and replace the glow plug with
gasket. Reconnect the blue glow plug wire.
5. You should now be able to start the engine with
the EZ-Start.
Centering the Servos
Whenever your radio system has been removed for service or cleaning,
the servos must be re-centered prior to installing the radio system in
the model. If the radio system is installed in the model, disconnect the
servo horns from the servos.
1. Connect the steering servo to channel 1 on your receiver and the
throttle servo to channel 2. The black wire on each servo cable is
positioned towards the outside edge of the receiver. Connect the
red and black cable from the battery holder to the "batt" terminal on
the receiver. The red wire is positive and the black wire is negative.
2. Place fresh "AA" batteries in the transmitter and turn the power
switch on.
3. Turn the Steering Trim knob to the center position.
Set the Multi-Function knob for Throttle Trim (see page 36)
to center the Throttle Trim.*
4. Now install fresh "AA" batteries into the battery holder and turn the
power switch to the on position. The servos will automatically jump
to their center positions.
5. Turn off the battery holder switch followed by the transmitter. The
servos are now ready to be installed. Be careful not to move the
servo shaft when reinstalling the servo horns.
*If throttle or steering sub-trim have been previously adjusted, they will need to be
reprogrammed to "zero."
Top Dead Center
Bottom Dead Center
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