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

Fit a conventional exhaust-pressurized fuel system
and select the same fuel as you intend to use for
flying the model.
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
short and simple running-in procedure is required and
can be carried out with the engine installed in the
modle. 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 1 turn open from the nomal
setting will usually suffice.
Close the needle-valve, then reopen it 1 turns.
Open the throttle fully and rotate the crankshaft
with an electric starter until fuel is seen to reach
the carburetor inlet nipple.
Warm the engine by allowing it to idle for about 30
seconds. If it stops, advance the throttle trim lever
slightly to increase idling speed and restart.
A
SETTING UP, STARTING AND ADJUSTMENT
RUNNING-IN ("Breaking-in")
1
2
1
2
Re-set the throttle stick to the closed position,
keeping the throttle trim lever in the advanced(i.e.
idle) position. Hold the rotor firmly against rotation
and start the engine. B
C
Reminder!
Do not touch, or allow any object to
come into contact with, the spinning tail
rotor.
15