O.S. Engines 160FX Ring - Manual (Page 11)

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5. Open the throttle approx. one-quarter.
Connect battery leads to glowplug.
(This is to avoid unnecessarily
high r.p.m. when the engine
starts.)
Bring electric starter into contact with spinner and depress
starter switch for one or two seconds. Repeat if necessary.
When the engine starts, withdraw the starter immediately. 7.
Fully closed position
Fully opened position
Set at this point
Attention :
Do not choke the carburettor air intake when applying the
starter. This could cause an excessive amount of fuel to be
drawn into the cylinder which may initiate an hydraulic lock
and damage the engine.
If the engine does not start within 10 repeat applications of
the starter, remove the glow-plug, check that it glows brightly
and that the cylinder is not flooded with fuel. (To eject excess
fuel, close needle-valve and apply starter with glowplug
removed.) Then try again.
8. When the engine starts, advance the throttle stick slowly
checking the increase of r.p.m. Abrupt throttle operation
right after starting may cause the engine to stumble or stop.
VERY IMPORTANT!
Before being operated at full power (i.e. at full-throttle and with the
needle-valve closed to its optimum setting) the engine must be
adequately run-in, otherwise there is a danger of it becoming
overheated and damaged. (See RUNNING-IN ["Breaking-in"] .)
6.
RUNNING-IN ("Breaking-in")
All internal-combustion engines benefit from extra care when
they are run for the first few times - known as running-in or
breaking-in. This is because the working parts of a new engine
take some time to settle down after being subjected to high
temperatures and stresses. Therefore, it is vitally important to
complete the break-in before allowing the engine to run
continuously at high speed and before finalizing carburettor
adjustments. However, because O.S. engines are produced
with the aid of the finest modern precision machinery and
from the best and most suitable materials, only a short and
simple running-in procedure is called for and can be carried
out with the engine installed in the model.
The process is as follows.
Install the proper propeller intended for your model. Open
the needle-valve 2-2 to turns from the fully closed position
and start the engine. Run the engine for two to three
minutes with the throttle fully open, but with the needle-
valve adjusted for rich, slow "four-cycle"operation.
Now close the needle-valve until the engine speeds up to
"two-cycle"operation and allow it to run for about 10
seconds, then reopen the needle-valve to bring the engine
back to "four-cycle"operation and run it for another 10
seconds. Repeat this procedure until the fuel tank is empty.
Refer to IDLING ADJUSTMENT section and fix the idling
position where the lowest possible r.p.m., with steady
running, is obtained.
Re-start and adjust the needle-valve so that the engine just
breaks into "two-cycle" from "four-cycle" operation, then
make three or four flights, avoiding successive "nose-up"
flights.
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