Environmental Conditions; Air Filter; Spark Plug - Stiga TRE224 Manual De Instrucciones

E. Engine code

3.5 ENVIRONMENTAL CONDITIONS

The operation of a four-stroke
endothermic engine is affected by:
a) Temperature:
– When operating at low temperatures
cold starts may be difficult.
– When operating at very high temperatures
warm starts may be difficult due to
evaporation of the fuel in the float chamber
of the carburettor or in the pump.
– In any case the right kind of oil
must be used, according to the
operating temperatures.
b) Altitude:
– The higher the altitude above sea level,
the lower the max power developed
by an endothermic engine.
– When there is a considerable
increase in altitude, the load on the
machine should be reduced and
particularly heavy work avoided.
3.6 FUEL
A good quality fuel is the major issue for the engine
reliability of operation.
Fuel must meet these requirements:
a) Use clean, fresh unleaded gasoline, with a min-
imum of 90 octane.
b) Do not use fuel formulated with ethanol greater
than 10%.
c) Do not add oil.
d) To protect the fuel system from gum formation,
mix a fuel stabilizer into the fuel.
Use of unapproved fuels will cause damage to en-
gine components, which will not be covered under
warranty.
NOTE Only use the fuel named in the technical
data table. Do not use other types of fuel. It is
possible to use ecological fuels, such as alkylate
petrol. The composition of this petrol has less of
an impact on people and animals. No negative
effects have been reported in connection to their
use. Nonetheless, there are types of alkylate
petrol on the market for which it is not possible
to provide specific indications on their use.
3.7 OIL
Use always high quality oils, choosing
their viscosity grade according to
the operating temperature.
• Only use detergent oil with a quality
of no less than SF-SG.
• Choose the SAE viscosity based
on the technical data table.
• The use of multigrade oil can lead to greater
consumption in hot weather, accordingly it is
necessary to check the level more frequently.
• Do not mix oils of different brands
and characteristics.
• SAE 30 oil, if used below +5°C, could
result in possible engine damage
due to inadequate lubrication.

3.8 AIR FILTER

The air filter must always be in perfect
working order, to prevent debris and dust
from getting sucked into the engine, reducing
the efficiency and life of the machine.
• Always keep the filtering element free of
debris and in perfect working order (par. 6.5).
• If necessary, replace the filtering
element with an original spare part.
Incompatible filtering elements can impair
the efficiency and life of the engine.
• Never start the engine without mounting
the filtering element properly.

3.9 SPARK PLUG

Not all the spark plugs for endothermic
engines are the same.
• Use only spark plugs of the recommended
type, with the right heat range.
• Check the length of the thread, because - if too
long - it will damage the engine beyond repair.
• Make sure that the electrodes are clean
and that their gap is correct (par. 6.6).
4. CONTROLS
4.1 ACCELERATOR CONTROL
This controls engine rpm.
The throttle trigger (generally a lever), fitted to the
machine, is connected to the engine by a cable.
Consult the machine's Instructions Manual to
identify the throttle trigger and its positions,
usually marked by symbols, corresponding to:
4