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5.3 Carburettor setting
L and H adjustments of the carburettor screws in their standard positions ensure correct engine
performance, optimal operating temperature and best lubrication of all parts. Carburation is
correct if:
•
The engine maintains a constant idle (1.800-2.000 RPM) and does not tend to turn off or
flood.
•
In rapid acceleration from low RPM, engine reacts immediately without power gaps or
shutdown.
•
At cruising RPM (approximately 5.000-6.000 RPM), engine provides a regular and smooth
thrust.
•
At max RPM (full throttle), thrust is constant and the RPM is between 7.300-7.650 RPM.
The idle screw is free and the position can be changed until the right RPM is reached. The two
screws L and H are sealed for safety reasons. Check that both carburettor screws are sealed and
in the correct position with respect to the marks. If the engine shows any of the problems listed
above, the carburettor should be checked by an authorized dealer.
Setting
Screw L
Screw H
Idle
Cosmos 300 – User manual – V3
Cosmos 300
34±2 minutes (sealed for warranty purposes)
74±2 minutes (sealed for warranty purposes)
1.800-2.000 RPM
32
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