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Starting 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 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.
Carburetor Adjustments
Adjust needle (L) for low rpm range 3/4 turn open
Adjust needle (H) for high rpm 1 turn open
Basic setting: throttle closed
Adjusting Needle L
Adjusting Needle H
Choke
Pressure Inlet
down. Then restart it and check the adjustment. If everything is all right, you can make your first flight. During the first few flights. do
not overload the engine and do not let it run at high revolutions for long periods of time (very important during hot weather). Use up all
the fuel that was mixed with the oil that is included with your engine. From then on, fuel and oil should be mixed in the proportion 40:1
First, start and warm the engine for 30-45 seconds before attempting to adjust the carburetor. In order to confirm that your engine is
properly adjusted you should follow the procedure below.
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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 30-45 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 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 (i.e. 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.
Having started the engine, leave it running for about 5 minutes at a higher idle speed. Then run it for about 20 minutes, while
changing revolutions from idle to 1/2–3/4 of the range and shortly holding each position—gradually prolong the holding periods. After
10 minutes of operation, open the throttle to maximum for a period of about one minute. At this point, stop the engine and let it cool
Starting the Engine Continued
Fuel for the Evolution Gas Engine
The Evolution
®
Gas engine has been designed to run on a mixture of high-quality unleaded gasoline and synthetic oil intended for racing
2-stroke gasoline engines. For the run-in period of the new engine, mix the fuel in a ratio of 30 parts gasoline to 1 part lubricant. After
run-in, use a ratio of 40 parts gasoline to 1 part lubricant.
Throttle Arm
1) Move the throttle from idle to 2/3 of the full throttle position quickly (fast acceleration). Then repeat three times – if the engine
accelerates smoothly go to step 3 below. If acceleration is not smooth, go on to step 2.
2) Faulty acceleration and a tendency to quit is usually attributable to a poor fuel mixture in the medium rpm range. Stop the engine
and recheck the fuel feed (the fuel line must not be pinched or broken). Restart the engine and test acceleration again. If the problem
persists, adjust the carburetor. Open the low speed needle by 1/8 turn and retest. If acceleration is smooth, open the needle by another
1/8 turn—this should be done because the needle was previously set too lean; if atmospheric conditions have changed recently you
may have to readjust the needle. If the engine continues to not accelerate properly, open the low speed needle by 10 minutes. If the
engine’s operation does not improve, shut it off and check the basic setting, restart the engine and test the acceleration. If the engine
runs correctly, go to step 3. If it continues to not accelerate properly, open the low speed needle by another 10 minutes. If acceleration is
faulty, the defect is likely to lie somewhere other than an incorrect adjustment.
3) If the engine accelerates correctly, according to the above test, set it at idle speed and accelerate to full speed. Repeat twice more. If
the engine functions correctly, go to step 4. If it cuts out, open the low speed needle by another 1/8 turn more.
4) If the engine reacts correctly set it at full speed. If revolutions do not drop, the engine has been adjusted successfully. If revolutions
seem to drop, open the high-speed needle by approx. 5–10 minutes.
Caution!
The engine must be stopped while you adjust the carburetor in order to prevent injury by the propeller.
Carburetor Adjustment