Tools, Accessories, Etc - O.S. engine FS-40S-C Owner's Instruction Manual

However, plug life can be extended and engine
performance maintained by careful use, i.e.:
•
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.
When to replace the glowplug
Apart from when actually burned out, a plug may
need to be replaced because it no longer
delivers its best performance, such as when:
•
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.

TOOLS, ACCESSORIES, etc.

The following items are necessary for operating
the engine.
FUEL
Use only top quality methanol-based model engine fuel.For
consistent performance and long engine life, it is advisable
to use fuel containing AT LEAST 18% lubricant. This engine
is designed to run on both low and high nitromethane content
fuels,i.e. from mild mixtures containing small percentage of
nitromethane, up to high-speed racing fuels containing 40%
nitromethane. Generally, power output is increased up to
a certain point as the nitromethane content of the fuel is
increased. As a starting point, we recommend a fuel
containing 10-20% nitromethane, changing to a fuel
containing more nitro only if necessary. When the nitro
content of the fuel is increased or the brand of fuel is
changed, it is advisable to initially run the engine with a richer
needle-valve setting, so that the optimum setting for the new
fuel may be rechecked as described in the RUNNING-IN
paragraphs. When engines are run at very high speeds and
on high-nitro fuels, glowplug elements do not last so long.
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