O.S. Engines GT55 - Manual (Page 9)

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INSTLLATION OF PROPELLER
Install the propeller on the shaft so that the
curved face of the blades faces forward – i.e. in
the direction of flight. Firmly tighten the propeller
washer and propeller retaining screws using the
correct size wrench. Always check the tightness
of propeller retaining screws and retighten them,
if necessary, before restarting the engine.
If the supplied retaining screws are too long due to a
thinner prop hub or too short due to a thicker prop hub
(cannot be screwed into the drive hub by more than
10mm), Use suitable length strong steel hex socket head
cap screws.
Install the propeller before the first flight of the day and
remove it after the day’s flight.
Make a habit of always checking the tightness of propeller
retaining screws making sure they are free of, damage or
rust before starting the engine. Replace the propeller
periodically (every 50 flights) even if it looks as ifs nothing
is wrong.
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Use regular gasoline. (No need to use high octane
gasoline.)
Alcohol based glow fuel cannot be used in this engine.
Not only will the engine not work properly but the internal
carburetor plastic parts will be damaged.
Use high quality commercially available 2 stroke engine
oil.
Follow the oil manufacturer’s recommendations
concerning the mixture ratio of gasoline and oil. If there is
no recommendation, mix with a 30:1 ratio.
We have checked and approved the following oil mixture
ratio.
KLOTZ ModelLube (50:1), COSMO Cosmo Terra 2 cycle
(50:1), RED LINE Two-Stroke Racing Oil (40:1).
(This does not mean we guarantee the quality of these
oils.)
Follow the instructions in the running-in section concerning
the mixture for running-in.
With a gasoline engine, passages in the carburetor are
narrower than that of a glow engine, and therefore very
sensitive against foreign matter such as dust. It is
suggested to use optional accessory Super Filter L (Code
No. 72403050) when filling a tank in the model from a
container used for transportation or storing.
Gasoline is poisonous. Do not allow it to come
into contact with the eyes or mouth. Always store
it in a clearly marked container in a cool and dark
place out of the reach of children. There is a
possibility that it may damage your health.
Gasoline is highly flammable. Keep it away from
an open flame, excessive heat, sources of
sparks, or anything else which might ignite it.
Do not smoke or allow anyone else to smoke
near to it.
Carry out mixing of gasoline and oil in a well-
ventilated and free of fire outdoor, place or there
is a possibility of fire.
Refill the models fuel tank only after the engine
has well cooled down, or there is a danger of fire.
Observe the laws and regulations in each country
and district concerning the usage, transportation
and storage of gasoline. Ask details at fire station
in each district.
MIXING OF OIL
R