O.S. engine MAX-21XM Owner's Instruction Manual page 4

This engine was designed for model boats.
Do not attempt to use it for any other purpose.
Mount the engine in your model securely, following
the manufacturers' recommendations, using
appropriate screws and locknuts.
Fit an effective silencer(muffler).
Frequent close exposure to a noisy exhaust
(especially in the case of the most powerful high-
speed engines) may eventually impair your hearing
and such noise is also likely to cause annoyance to
others over a wide area.
For their safety, keep all onlookers (especially
small children) well back (at least 12 feet or 4
metres) when preparing your model for running.
Take care that the glowplug clip or battery leads do
not come into contact with the propeller or any
other rotating parts. Also check the security of the
linkage to the throttle arm.
NOTES
When starting your engine, use an electric
starter.The wearing of safety glasses is also
strongly recommended.
When handling the boat immediately
launching, be especially cautious. Keep the
propeller and other rotating parts away from you.
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.
Warning! lmmediately after a glowplug-ignition
engine has been run and is still warm, conditions
sometimes exist whereby it is just possible for the
engine to fire if the glowplug battery is accidentally
reconnected.
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