Fuel - O.S. engine MAX FXi 46 Owner's Instruction Manual

When to Replace the Glow Plug
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.
Select, by practical tests, the most suitable
fuel from among the best quality fuels
available in your country for model use. For
the best performance, a fuel containing 5%
to 20% nitro methane is preferable.
Lubricants may be either castor oil or a
suitable synthetic oil (or a blend of both)
provided that they are always of top quality.

FUEL

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 deteriorate and may
adversely affect running qualities.
Once a satisfactory fuel has been selected
and used for a while, it may be unwise to
needlessly change the brand or type. In any
engine, a change of fuel may cause carbon
deposits in the combustion chamber or on
the piston head to become detached and
lodged elsewhere, with the risk of this
causing unreliable operation for a while. If,
however, the adoption of a different fuel is
unavoidable, check the engine for the first
few flights on the new fuel, by temporarily
reverting to the running-in procedure.
Reminder! Model
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.
11
engine fuel is