ALREADY DONE AT PETROL PUMPS). IMPORTANT: with very hot climate
and high temperatures use PERCENTAGE 2.2%.
When you prepare the mixture, make sure that the can has not dirt or water in it,
put always the oil first and mix thoroughly.
Never run the engine without the air-filter, because dirt and dust raised by the
propeller can damage it.
ADJUSTMENT OF THE CARBURETTOR
The carburettor has two mixture adjustment screws, 1 marked L adjusting low
speed and 1 marked H for high speed.
In order to make the adjustment, gently tighten clockwise then unscrew: L screw
from 3/4 (three quarter) to one turn, H screw from 1 1/4 (one and a quarter) to 1
1/2 (one and a half) turn -adjustment with filter Air Box (Kart model), we advise
this kind of air-filter-. Furthermore, we advise to put a small security-cable on the
air filter, on the muffler, to avoid that it can come off, and on the three springs of
the exhaust . These adjustments can be different on the basis of weather conditions
and flight altitudes. Ideal mixture is reached when the insulator of the spark
plug is coffee brown; if the colour is black, the mixture is too rich, therefore turn
screw H clockwise 1/8 round per time. If the spark plug is grey/white, the mixture
is lean, therefore turn screw H and L counterclockwise always 1/8 round per a
time. Remember that if the mixture is too lean, THE PISTON CAN SEIZE. You
can see better the colour of the spark plug by keeping the engine for 20 seconds at
maximum speed and switching it off suddenly without letting it slow down. Once
you have found the perfect mixture do not change it unless you change flight place
or climate conditions, since register screws can be damaged by continuous
adjustments.
RUNNING-IN
All CORS-AIR engines, before being delivered, are subject to a severe quality-
check, in order to verify if all the components respect the fixed parameters, but a
further running-in is anyway necessary. A GOOD RUNNING-IN WILL
PROLONG THE LIFE OF YOUR ENGINE.
Go to a quiet place, put a thick rubber carpet under your craft to avoid that stones
or other things damage the propeller by putting it on earth and let the engine work
at a speed of 2500 rpm for 5 minutes, then regulate speed at 3000/3500 rpm for 15
minutes, then at 4000 rpm for other 15 minutes. Switch off the engine and check
that there are no loose nuts or bolts and that every component is ok. BE
CAREFUL NOT TO TOUCH HOT PARTS (POWER UNIT AND EXHAUST
PIPE). Start the engine again and take it step by step to 4000 rpm for 5 minutes,
then accelerate to 4500 rpm for 15 minutes. During the first 10 hours, do not
subject the engine to extreme efforts and speed. Also during normal use eccessive
loads (ex. tandems with passenger) can force the engine with possible damages to
the engine itself. ALWAYS CHECK at sight your craft before and after every
flight, for loose parts or damage. After each flight, in the version with
decompressor, clean the head from possible oil residues. During the run-in period
vary the power often for a proper piston ring setting.
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