O.S. Engines 61RX-H WC - Manual (Page 16)

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short and simple running-in procedure is required and
can be carried out with the engine installed in the
model. 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 stope. About one half turn open from the
nomal setting will usually suffice.
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ADJUSTMENT
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 ro-
tor.
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 is 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
RUNNING-IN ("Breaking-in")
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Please observe the following before beginning to
make any adjustment.
• High-Speed Needle Valve. Turn this approximately
30˚ (3 to 4 click) at a time, when making initial
adjustments; then in steps of approximately 15˚ (1
to 2 clicks) when making final adjustments.
• Medium-Speed Needle Valve. Turn approximately
45˚ (4 to 5 click) at a time.
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