Horizon Hobby Evolution 152GX, User Manual

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9
Starting the engine by using your hand or fingers can lead to a
serious injury. We recommend that you use a rubber stick to start
the engine.
The new Evolution Engine carburetor comes 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 plug socket
is fitted in place and fastened down properly. Fix the ignition
sensor in the proper position above the magnet with the
screws enclosed. Follow the directions in the Ignition System
addendum on page 8 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 plug socket.
This could lead to ignition damage.
Starting the Engine
Carburetor Adjustments 152GX
Basic initial settings:
Adjust needle (L) for low rpm range 50 minutes
Adjust needle (H) for high rpm 1 turn
NOTE: The Low Speed adjustment is to the left of the high speed needle.
Basic Setting - Throttle Closed
Starting and Choke valve operation
1) When you are ready to start your engine, make sure that the ignition is
switched off, the choke valve is closed and the throttle valve is partly open.
Confirm that fuel is filling the fuel line to the carburetor, then switch the
ignition to the ON position. Flip the propeller smartly until the engine fires.
With the choke in the closed position, the engine will fire then quit.
2) Open the choke valve and set the throttle at a slightly high idle position. Be
sure to have a helper hold the model securely. Give the propeller a few quick
flips. When the engine starts, allow it to idle for 30 to 45 seconds in order
for it to warm up to operating temperature. At this point, you can proceed
to test the carburetor settings before flying your model. See the following
section regarding carburetor adjustment.
3) If the engine does not start, leave the throttle at the high idle position,
turn the ignition off, then on and close the choke valve. Start the engine
with the throttle at the fast idle position and the choke valve closed. The
engine should fire and quit. If it does, repeat step 2 above.
4) At this point, if the engine still will not start, unscrew the spark plugs
and check the contacts. Clean any possible excess fuel (an indication of
engine flooding) and screw them in again. Further starting should only be
done with the throttle at idle position and the choke in the open position.
If the plug is dry, then probably not enough fuel has been drawn into the
carburetor. If that is the case, check for proper fuel feed and then return to
the instructions given in paragraph 1.
Adjust Needle H
Adjust Needle L