Running-In (''Breaking-In'') - O.S. engine MAX-21XM Owner's Instruction Manual

RUNNING-IN (''Breaking-in'')

For long life and high-performance, every engine needs to be
properly 'run-in' or 'broken-in'. There are several running-in
methods, but the following is suitable for use with the MAX-
21XM.
1.
Turn the Needle-Valve clockwise slowly and gently until it
stops. This is the fully closed position. Do not use force to
turn the Needle-Valve beyond this point. Now reopen the
Needle two-and-one-half turns. (The set-screw on the
Needle-Valve knob may be used as a reference mark.)
2. Set the throttle at the starting position, (i.e. very slightly
opened from idling position) and start the engine.
The propeller blades are extremely sharp. Never touch, or
allow any object to come into contact with, the rotating
propeller and do not crouch over the engine when it is
running. Do not touch any part of the power-head until it
has cooled. Contact with the muffler (silencer) or cylin-
der, also, may result in a serious burn.
WARNING!
It is vitally important to set the throttle at the correct starting
position before starting the engine. If the engine is allowed to
run under 'no-load' conditions, it will speed up to extremely
high revolutions even at part-throttle settings
result in serious damage.
Be careful not to put excessive load on the steering servo when
starting the engine with an electric starter. It is advisable to set
the steering fully left before applying an electric starter.
3.
It is necessary to warm up the engine by running it at
around the idling setting for a while after starting, as with
the engine of a full size boat. High r.p.m. operation without
warming up will shorten engine life or damage it.
Leaving the Needle-Valve set at the starting setting of 2-1/2
4.
turns open, run the boat several times with the throttle fully
open until at least three full tanks of fuel have been
consumed. (It should be noted that, at this stage, it may not
be possible for the engine to idle reliably because of the
over-rich setting of the Needle-Valve.)
This completes the initial running-in stage.
5.
For the remaining period of running-in, refer to the
adjustment procedures detailed later.
The boat will need to be run for about 10 tanks of fuel to
complete the running-in period.
Note!
If as a result of your boat being capsized, the engine
takes in water, remove the glowplug, invert the engine
and eject water by carefully turning the flywheel, first by
hand and then with the electric starter. Make every effort
to ensure that no water remains in the engine before
attempting to restart it, or it may be damaged by an
hydraulic lock.
To ensure that any traces of water (which may also cause
internal rusting if not dealt with)are flushed out, use an
which may
appropriate water-displacing spray lubricant.
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