Evolution Engines EVOE40GX - Manual (Page 4)

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note: One of the features of the 40GX is the way the spring-loaded choke is activated and released open. With the throttle closed, rotate the
choke closed and the choke linkage will engage the throttle lever and lock into the closed position. The choke will stay locked in place until
the throttle lever is slightly opened, and then the choke will automatically disengage from the throttle lever.
1) Be sure that the propeller nut is tight and that the spinner (if used) is secure and not touching the propeller blades. Check to be sure that the
carburetor throttle is operating properly by turning on the radio and moving the throttle stick of the transmitter to low; the carb throttle butterfly blade
should be closed completely. Now move the transmitter throttle to high and be sure the carb throttle butterfly blade opens up completely.
2) Have someone assist in holding the airplane. Close the choke completely so that the choke engages the throttle lever and remains closed. This also
automatically sets a slightly high engine idle for starting the engine.
3) When you are ready to start the engine, switch the ignition on and, using an electric starter, begin to crank the engine over counterclockwise. The motor
should fire or “pop” within a few seconds of applying the starter. At this point you have two choices of when to deactivate the choke.
a) As the engine “pops” and begins to run, you can blip the throttle slightly and this will disengage the choke lever and allow the choke to open
completely; the engine should remain running. Allow the engine to run for 30–45 seconds and then adjust for a proper idle.
b) Allow the engine to “pop” and then stop running. Open the choke now by moving the throttle just above idle to disengage the choke lever. Set the
throttle to the idle position (carb butterfly plate slightly open). Engage the electric starter to the engine again, and the engine should fire and be
running at a fast idle. Allow the engine to run for 30–45 seconds and then adjust for a proper idle.
4) If the engine does not start even after using the starter to crank the engine a second time, open the throttle to maximum, turn off the ignition and turn
the engine about 4 revolutions. Switch the ignition on again, then restart the engine with throttle at a fast idle position and the choke valve set open.
5) At this point if the engine still will not start, unscrew the spark plug and check its contacts. Clean any possible excess fuel (an indication of engine
flooding) and screw it in again. Further starting should only be done with the throttle at idle position. If the plug is dry, then probably not enough fuel
has been drawn into the carburetor. If that is the case, check the fuel feed and then return to the instructions given in paragraph 1 above.
Starting the engine
Evolution Gas Engines come with a carburetor adjusted to a
basic setting. This setting should be maintained during the
initial break-in runs.
Before you first start the engine, make sure that the spark
plug is screwed in and tightened and that the spark plug
socket is fitted in place properly. Fix the ignition sensor in the
proper position above the magnet with the screws enclosed.
*Follow the instructions in the ignition system section to mount
the ignition module in your model.
Important: Never turn the engine over with the ignition
turned on unless the spark plug is inserted in the spark plug
socket. This could lead to ignition damage.
carburetor Adjustments 40gX
Adjust needle (L) for low rpm range 1 turn and 30 minutes
Adjust needle (H) for high rpm 1 turn and 45 minutes
Basic setting: (minutes refer to the hands of a clock)
Adjusting Needle H
Adjusting Needle L
(directly below Needle H)
Throttle Lever
Idle Stop Screw
Choke Lever
Pressure Inlet
Fuel Intake