O.S. Engines 21RZ-R (P) - Manual (Page 13)

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Use the same fuel as is to be employed for all initial
running and containing NOT LESS THAN 18%
lubricant.
STARTING THE ENGINE & RUNNING-IN ('Breaking-in')
Open
Close
Needle Valve
The following procedure is suitable for these engines
when the O.S. T-2030 tuned silencer and a fuel
containing up to 30% nitromethane are used.
For long life and high performance, every engine
needs to be 'run-in' or 'broken-in'. With care, running-
in of the MAX-21RZ-R(P) can be carried out with it
installed in the vehicle. Be sure to fit the air-cleaner to
the carburetor and to use a muffler-pressurized fuel
system.
Temporarily remove the glowplug to check that it
glows bright red when energized.
Open the Needle-Valve 3 turns from the fully closed
position.
Switch on the transmitter and receiver and set the
throttle very slightly opened from the idling position
(see sketch, top right).
DO NOT energize glowplug, but apply electric
starter to draw fuel to carburetor.
Now connect glowplug battery lead to heat the plug
filament and start the engine.
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It is vitally important to set the
throttle at the correct position
before starting the engine. If
the engine is allowed to run
with the throttle too far open
under ''no load'' conditions (i.e.
with the driving wheels not in
contact with the ground) it will
rapidly over-heat and may be
seriously damaged.
Attention:
12
0.3 ~ 0.5mm