User Manual
EN
11
Now that you have the baseline needle valve
settings, you are ready to start your engine for
the rst time. With the 15GX it is very
important to allow the temperature to
stabilize above 170°F (75°C) before making
any adjustments; adjusting prior to the engine
warming up will lead you to inaccurate
settings. As the engine warms up you will
notice the rpms naturally rising.
If you do not have a temp gun or have sensors
installed on your engine, allow the engine to
run at half throttle for at least 45 seconds be-
fore attempting to set the high-speed needle.
If you have accurately set the low-speed
needle as described you should not need to
adjust it.
Priming
1. Make sure your ignition is off.
2. Open the throttle fully and, either by hold-
ing a finger over the carburetor intake or
the mufer exhaust, ip the propeller 6
times.
3. Remove your nger from either the carbure-
tor or muffler exhaust and flip the engine
another 6 times.
4. Close the carburetor completely with your
throttle stick and then open it two detents
from closed. This will allow the engine to
start at a high throttle setting.
Because each fuel system and installation
is slightly different, you may find the need
to modify the above procedure for your
individual setup. The above procedure should
work for most installations.
Starting and Operating the 15GX Engine
Telemetry is a huge asset to help you tune
your engine. The ignition module is even
capable of communicating with Spektrum
telemetry systems directly so you won’t have
to add an additional RPM sensor. You will
need to connect the Evolution Ignition
Telemetry Adapter (EVOA107) between the
RPM port on the ignition unit and the RPM
port on your Spektrum telemetry module in
order to utilize this feature. Telemetry systems
other than Spektrum may require a dedicated
RPM sensor.
We recommend using the Spektrum DSMX Full
Range Aircraft Telemetry Module (SPM9548)
in conjunction with the included adapter. This
system allows you to see real-time RPM and
temperature readings from the engine.
The temperature sensor should be wrapped
around the base of the spark plug on the
cylinder head. Using telemetry gives you an
accurate representation of actual temperature
and rpm figures during use, and warnings
can be set to go off if your engine is getting
too hot.
The temperature range can be 275–300ºF
on average. Set your maximum temperature
warning to go off if the engine exceeds 350ºF.
If your engine is continually near this peak
temperature or higher, immediately decrease
throttle to bring the temperature down. If this
continues to occur, land the airplane and add
additional baffling to your cowl. It is not good
for the engine to run at temperatures this high
and could cause damage if not attended to.
Telemetry
Until the engine is broken in, use an electric
starter to start the engine. Once it is fully
broken in it can be started by hand, but it is
easier and safer to start the engine with an
electric starter.
1. Turn on the ignition.
2. Rotate the propeller in a backwards direc-
tion against compression.
3. Push the starter rmly against the nose
cone and engage. The engine should start
relatively quickly, within 1–2 seconds. Once
the engine starts disengage the starter.
4. Let the engine run at mid-throttle for 45
seconds to stabilize the temperatures.
a. If the engine doesn’t start quickly, disen-
gage the starter. Continuously running
the starter can flood the engine.
b. Check to make that fuel is moving
through the carburetor system.
c. If the engine appears not to have any
fuel, repeat the priming procedure
above.
d. Repeat 1–4 of Starting and Running the
Engine.
Starting and Running the Engine