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Alpina AT2 72 HA Manual

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4
3.5 ENVIRONMENTAL CONDITIONS
The operation of a four-stroke
endothermic engine is aected by:
 Temperature:
– When operating at low temperatures
cold starts may be dicult.
– When operating at very high temperatures
warm starts may be dicult due to
evaporation of the fuel in the oat chamber
of the carburettor or in the pump.
– In any case the right kind of oil
must be used, according to the
operating temperatures.
 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:
 Use clean, fresh unleaded gasoline, with a min-
imum of 90 octane.
 Do not use fuel formulated with ethanol greater
than 10%.
 Do not add oil.
 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
eects 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 specic 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 dierent 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 lter must always be in perfect
working order, to prevent debris and dust
from getting sucked into the engine, reducing
the eciency and life of the machine.
• Always keep the ltering element free of
debris and in perfect working order (par. 6.5).
• If necessary, replace the ltering
element with an original spare part.
Incompatible ltering elements can impair
the eciency and life of the engine.
• Never start the engine without mounting
the ltering 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), tted 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:
• FAST = corresponds to maximum
revs; to be used when working.
• SLOW = corresponds to minimum revs.
• CHOKE = to be used for cold
starts (when applicable)
… 75 …


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