O.S. Engines 21RZ-V01B (P) - Manual (Page 13)

Apart from when actually burned out, a plug may
need to be replaced because it no longer delivers its
best performance, such as when:
When to replace the glowplug
Filament surface has roughened and turned white.
Filament coil has become distorted.
Foreign matter has adhered to filament or plug
body has corroded.
Engine tends to cut out when idling.
Starting qualities deteriorate.
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TOOLS, ACCESSORIES, etc.
FUEL
Generally, it is suggested that the user selects a fuel
that is commercially available for model two-stroke
engines and contains 10-30% nitromethane. As a
starting point, we recommend a fuel containing 20%
nitromethane, changing to a fuel containing more nitro if
necessary. When the brand of fuel is changed, or the
nitro content increased, it is advisable to repeat the
running-in procedure referred to in the RUNNING-IN
paragraphs.
GLOWPLUG BATTERY
REMINDER!
Model engine fuel is poisonous. Do not
allow it to come into contact with the eyes
or mouth. Always store it in a clearly
marked container and out of the reach of
children.
Model engine fuel is also highly
flammable. Keep it away from open flame,
excessive heat, sources of sparks, or
anything else which might ignite it. Do not
smoke or allow anyone else to smoke,
near to it.
The power source for heating the glowplug may be
either a large, heavy-duty 1.5-volt cell, or a 2-volt re-
chargeable lead-acid cell with extended leads (or a
resistance) to reduce the applied voltage to approxi-
mately 1.5-v.
The following items are necessary for operating the
engine.
Please note that with high-nitro fuels, although power
may be increased for competition purposes, glowplug
elements do not last so long and engine life will be
shortened.
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