O.S. Engines 46LA-S - Manual (Page 15)

Install a plug suitable for the engine.
Use fuel containing a moderate percentage of
nitromethane unless more is essential for racing
events.
Do not run the engine too lean and do not leave the
battery connected while adjusting the needle.
However, plug life can be extended and engine
performance maintained by careful use, i.e.:
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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STARTING THE ENGINE Preparations
1 Installing the glowplug
Install the washer on the glowplug and
screw carefully into cylinder-head,
making sure that it is not cross-
threaded before tightening firmly.
Glow plug
Washer
2 Installing the propeller
First, mount the propeller on the engine by tightening
the prop nut or spinner-nut lightly, and make sure of
the position where compression is felt, turning the
propeller counter-clockwise slowly. Then tighten
firmly as explained below.
Glowplug life
Particularly in the case of very high performance
engines, glowplugs must be regarded as expendable
For accurately centering the
starter's rubber drive insert,
use an O.S. solid alloy
spinner-nut. (Available as an
optional extra part).
Alternatively, a spinner
assembly, enclosing the
propeller boss, may be
used, but make sure
that it is of sturdy construction and that the spinner
shell does not loosen when the starter is used.
Wrench
14