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strictly associated with the quality of the products used and with the scheduled maintenance.
The following information allow a better understanding and use of your engine.
4.1 ENVIRONMENTAL CONDITIONS
The operation of a four-stroke endothermic engine is affected by:
a) Temperature:
– Working in low temperatures could lead to a difficult cold starting.
– Working in very high temperatures could lead to a difficult hot starting due to the evaporation of the
fuel either in the carburetor float chamber 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.
4.2 FUEL
A good quality fuel is the major issue for the engine reliability of operation.
a) Use unleaded gasoline, with a minimum of 90 octane.
b) Use clean, fresh fuel; purchase fuel in quantity that can be used within 30 days, to prevent gum from
forming inside the container or the tank.
c) Do not use fuel which contains Methanol.
d) Do not add neither oil nor any kind of fuel additive.
4.3 OIL
Use always high quality oils, choosing their viscosity grade according to the operating temperature.
a) Use only detergent oil classified SF-SG.
b) Choose the SAE viscosity grade of oil from this chart:
– from 5 to 35 °C = SAE 30
– from -15 to + 5 °C = 5W-30 or 10W-30 (Multi-viscosity)
– from -25 to + 35 °C = Synthetic oils 5W-30 or 10W-30 (Multi-viscosity)
c) The use of multi-viscosity oils in hot temperatures will result in higher than normal oil consumption;
therefore, check oil level more frequently.
d) Do not mix oils of different brands and features.
e) SAE 30 oil, if used below +5°C, could result in possible engine damage due to inadequate
lubrication.
f) Oil should be at «MAX» mark (see 5.1.1): do not overfill. Overfilling with oil may cause:
– Smoking;
– Spark plug or air filter fouling, which will cause hard starting.
4.4 AIR FILTER
The air filter must always be in perfect working order, to prevent debris, dirt or dust from getting sucked
into the engine, reducing the efficiency and working life of the machine.
a) Always keep the filter element free of debris and dirt in perfect working order (see 6.5).
b) If necessary, replace the filtering element with an original spare part. Incompatible filtering elements
can impair the efficiency and life of the engine.
c) Never start the engine without mounting the filtering element properly.
4.5 SPARK PLUG
Not all the spark plugs for endothermic engines are the same!
a) Use only spark plugs of the recommended type, with the right heat range.
b) Check the length of the thread, because – if too long – it will damage the engine beyond repair.
c) Make sure that the electrodes are clean and their gap is correct (see 6.6).
5. STANDARDS OF USE
Before every use, perform the following checking procedures in order to assure a regular operation.
5.1.1 Check oil level
See the specific chapter (see 8.1) for the oil to be used.
a) Place engine level.
b) Clean around oil fill.
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