Step I
- Accelerate to 2/3 of the throttle range within approx. 1 sec (faster acceleration). Repeat
three times – if the engine accelerates quickly and without a hiccup go to Step III. If
acceleration is not smooth go on to Step II.
Step II
- Faulty acceleration with hiccups and a tendency to cut out is usually attributable to a poor
fuel mixture in the medium-revolutions range. Stop the engine and recheck the fuel feed (the
hose-pipe must not be pinched or broken; if fitted, check also the fuel filter permeability).
Restart the engine and test acceleration again. If problems persist adjust the carburetor.
Open the adjusting needle L by 5 min and retest acceleration. If acceleration is smooth, open
the needle by another 3-5 min - this should be done because the needle was previously set at
a boundary value; if atmospheric conditions changed during flight, the problems might
recur.
- If the engine continues to malaccelerate open the needle by 10 min if the engine’s
operation does not improve, stop it and check the basic setting. Set the adjusting needle L at
1 turn and the adjusting needle H at 1,5 turn . Restart the engine and test acceleration. If the
engine runs correctly go to Step III. If it continues to malaccelerate, open the needle by
another 10 min. If it keeps malaccelerate, the defect is likely to lie elsewhere than in
incorrect adjustment. In such a case, go to the section on problem solving.
Step III
- 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 IV.
If it cuts out, open the L needle by 5-10 min more.
- If the engine does not respond to acceleration fast enough keep closing the L needle until
the engine starts to cut out in response to gas. At that point reopen the L nozzle by 5-10 min.
Step IV
- 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 adjusting needle H by
approx. 5-10 min.
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.
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