Caution!!! The engine must be stopped while you adjust the carburetor in order to prevent
injury by the propeller.
Caution!!! Never close the choke valve completely when the engine is operating!
The choke valve is set to allow minimum air flow only when fully closed, which could cause
damage to the intake reed valve.
If the throttle pull rod is not equipped with flexible element it is recommended NOT to put off
the throttle valve spring. Otherwise the vibrations of the engine can cause excessive wear of
the throttle valve shafting and with this deteriorate the carburetor function.
Adjusting Carburetor’s Position
You can turn the rear cover by 90
°
which makes it possible to adjust the carburetor’s position
(especially its adjusting needles) when fixing it in the model.
How to dismantle the rear cover:
Unscrew the two M4 screws that hold the carburetor in place, remove the pressure hose from
the carburetor (mind the gasket under the carburetor), remove the carburetor and loosen four
M5 screws along the crankcase (Caution! Do not loosen the M4 screws that fix the reed-valve
to the rear cover).
Remove the rear cover by pulling it out of the crankcase – never use a hammer or any other
similar tool. The rear cover is sealed in the crankcase with two sealing rings – therefore more
strength is needed, however, it must always be pulled only!
Make sure you disassemble the engine in a clean environment!
Position the rear cover as desired, carefully insert it in the crankcase and tighten the screws.
Do not forget to insert the gasket when reassembling the carburetor.
Starting and running in a new engine
Before you first start the engine, screw the plug in and tighten it up. Follow the instructions on
the box of the spark plug. Make sure that the plug socket is fitted in place and fastened down
properly; pull the wire ring over the hexagon.
Fix the ignition sensor in proper position above the magnet with screws enclosed.
Unless the spark plug is inserted in plug socket, never turn the engine with ignition turned
on. This could lead to ignition damage!
1) Make sure that the ignition is switched off, the choke valve is closed and the throttle valve
is about half opened. Then give the engine 3-4 turns, provided that the carburetor is not
flooding. If it is flooding, only give the engine 1-2 turns.
2) Switch the ignition on, open the choke valve, set the throttle at slightly higher idle speed
and give the engine a few counter-clockwise flips. If even after the fourth flip, there is no
indication of the engine starting, or firing, give the engine 2 turns following the instructions in
paragraph 1 above. Then proceed according to instructions given in paragraph 2.
3) If the engine does not start even after another set of flips open the throttle to maximum and
give the engine approx. 4 turns. Switch the ignition off and on again and restart the engine
with throttle turned slightly down and the choke valve set open.
4) If the engine still would not start, unscrew the plug and check its contacts. Clean any
possible petrol moisture (i.e. an indication of engine flooding) and screw it in again. Further
starting should only be done with the throttle turned down. 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.
If the engine starts to run backwards do not open the throttle - stop the engine immediately!
Otherwise the engine can be damaged!
Having started the engine, leave it running for about 5 minutes at a higher idle speed. Then run
it in for approx. 20 minutes while changing revolutions from idle to ½ - ¾ 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 a minute. At this point stop the
engine and let it cool 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 fuel that was mixed with the oil that is included with your engine. From now on,
fuel and oil should be mixed in the proportion 40:1.
•
DO NOT PROCESS THE RUNNING-IN AT IDLE SPEED!
•
A COLD ENGINE SHOUL BE WARMED UP BY SHORT
ACCELERATIONS (1-2 SECONDS)
