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4. WHAT YOU NEED TO KNOW
The engine performance, reliability and life are influenced by many factors, some
external and some strictly associated with the quality of the products used and with
the scheduled maintenance. The following information allows 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 start.
• Working in very high temperatures could lead to a difficult hot start 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
Good quality fuel is important for reliable engine 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
b) gum from forming inside the container or the tank.
c) Do not use fuel which contains Methanol.
d) Do not add either oil or 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.
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