O.S. engine MaX-37SZ-HRING Manual page 12

7. Preparation of starting
Make sure that the transmitter
throttle stick is at the fully closed
position and the throttle trim at
center position, and make sure that
idle-up switch on the transmitter is
off. Hold the rotor head by hand so
that rotor cannot rotate when the
engine is Started. Also, steady the
model with a foot on the landing-
gear skid.
Starting
8.
Connect the battery to the glowplug and start the
engine by applying the starter. When started,
switch off the starter and withdraw the starting
shaft after making sure the rotation of the starter
shaft stops.
Stopping the engine
9.
Fully pull down the throttle trim on the transmitter.
All internal-combustion engines benefit, to some
degree, from extra care when they are run for the first
few times known as running-in or breaking-in.
This allows the working parts to mate together under
load at operating temperature.
However, because O.S. engines are made with the
aid of the finest modern precision machinely and from
the best and most suitable materrials, only a very
short and simple running-in procedure is required and
can be carried out with the engine installed in the
model.
Note:
Make sure that the throttle linkage is made so that
the throttle is fully closed when the throttle lever
as well as trim lever on the transmitter are fully
pulled down.
In case the engine does not stop.
Hold the rotor head, and pinch the silicone tube to
stop the fuel supply. If it still does not stop, pull off the
fuel tubing from the carburetor. It is necessary to
readjust the throttle linkage so that the carburetor
rotor is fully closed when the throttle stick and throttle
trim on the transmitter are fully pulled down.
NOTE:
If the throttle response is poor or the engine
stops due to a temporarily over-rich mixture im-
mediately after the engine is started, pinch the
fuel line for one or two seconds until the engine
r.p.m. increase and the engine runs steadily.
Reminder!
!
Never touch, or allow any object to come
into contact with, the rotating rotor.
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RUNNING-IN ("Breaking-in")
For the first few flights with a new engine i.e. while
the engine is being run-in set the needle-valve for a
slightly rich mixture not excessively rich as this may
result in poor throttle response and cause the engine
to stop.
About one half turn open from the nomal setting will
usually suffice.
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