O.S. Engines 61LX-H - Manual (Page 12)

Install a plug suitable for the engine.
Use fuel containing a moderate percentage of
nitromethane.
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.
•
•
•
•
•
•
•
•
FUEL
Select, the most suitable fuel from among the best
quality fuels available in your country for helicopter
use. For the best throttle response, a fuel containing
5% to 30% nitromethane for the 60G carburetor is
preferable. The 60H carburetor is designed to use
less than 10% nitromethane fuel. Lubricants may be
either castor-oil or a suitable synthetic oil (or a blend
of both) provided that they are always of top quality.
For consistent performance and long engine life, it is
essential to use fuel containing AT LEAST 18%
lubricant by volume. Some fuels containing coloring
additives tend to deterriorate and may adversely
affect running qualities. Select by practical tests when
experimenting such fuels.
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.
Reminder!
11