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CARBURATION
NB: in this paragraph the words "MIXTURE" indicates the union of the two elements (AIR) +
(OIL/GASOLINE) which takes place inside the carburetor.
Weather conditions or altitude changes have influence to the operation of the
engine as it varies the air density and, consequently, changes the mix ratio between
the element AIR and the element OIL /GASOLINE.
In general, we can state that at high altitude, high humidity or high temperatures,
less air enters and therefore the mixture is richer in oil/gasoline: you will have to re-
establish the proper relationship by screwing the two screws "H/L”.
In contrast, with low temperatures and low humidity, the air will become denser so
a lean carburetion requires you to unscrew the two screws "H / L".
WARNING: A mixture that is too low in oil/gasoline causes considerable damage to
the engine that can cause a break down and/or stop it suddenly. It is recommended
to carry out the carburetion operations with the ENGINE SWITCHED OFF.
When the "H / L" screws are tightened/loosened, carry out variations of 1/8 of a
turn each time or "45°", larger movements in a turn can cause engine damage.
RUNNING-IN
WARNING
• Before starting the engine, make sure that there are no loosened screws or
improperly attached parts;
• Ensure that any person is at a distance of absolute safety and never in the range of
the propeller;
• Do not start the engine where there are rocks or any objects that the force
generated by the propeller can lift and throw even at a considerable distance;
• Do not start the engine without the propeller nor the exhaust;
• Do not start the engine indoors: the exhaust gases contain poisonous carbon
monoxide which are toxic and can cause loss of consciousness and death.
The engine, before being sold, is subjected to a pre-running-in to verify the proper
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