O.S. engine MAX 140RX FI Owner's Instruction Manual page 5

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Adjust the throttle linkage so that the engine stops when the throttle stick
and trim lever on the transmitter are fully retarded. Alternatively, the
engine may be stopped by cutting off the fuel supply. Never try to stop the
engine physically.
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Take care that loose clothing (ties, shirt sleeves, scarves, etc.) do not come
into contact with the propeller.
Do not carry loose objects (such as pencils, screwdrivers, etc.) in a shirt
pocket from where they could fall through the propeller arc.
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Do not start your engine in an area containing loose gravel or sand.
The propeller may throw such material in your face and eyes and cause
injury.
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For their safety, keep all onlookers (especially small children) well back (at
least 20 feet or 6 meters) when preparing your model for flight. If you have
to carry the model to the take-off point with the engine running, be
especially cautious. Keep the propeller pointed away from you and walk
well clear of spectators.
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Warning! Immediately after a glowplug-ignition engine has been run and is
still warm, conditions sometimes exist whereby it is just possible for the
engine to abruptly restart if the propeller is casually flipped over
compression WITHOUT the glowplug battery being reconnected.
Remember this if you wish to avoid the risk of a painfully rapped knuckle!
NOTES
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