COMCO IKARUS
Maintenance Manual C42 Series
MaintenanceManual C42-
Series_Issue_VII_18.02.2014.doc
Revison No.:1 66 from 107
4.3 Maintenance instructions
4.3.1 Engine compartment
4.3.1.1 Synchronising the carburettors
Synchronising the carburettors may either be done by pneumatic synchronising or by
mechanical synchronising. For pneumatic synchronising two manometers are
required. No special tools are required for mechanical synchronising.
The procedures are described in the Rotax maintenance manual.
Figure 56: Carburettor
A simple mechanical method is described here:
Pre-requisite: The throttle valve stop screws must be synchronised.
•
Set the throttle to idle and then open the throttle until there is approx. ½ -1mm
play on one of the two throttle valve levers (check play by moving the throttle
valve lever by hand).
•
Try to move the throttle valve lever of the 2nd carburettor by hand applying the
same force.
•
Both throttle valve levers should have the same amount of play.
•
Adjust play as required with the Bowden cable adjustments nuts (SW9).
During the first 50 operating hours in particular, the Bowden cables and sleeves tend
to "set" so that the correct settings carried out in the factory may change noticeably.
Note: The throttle valve levers should reach their stop simultaneously when the
throttle levers in the cockpit are approx. 5 mm in front of the pilot seat. An
inadmissible force on the carburettors is thus averted (stop).
choke detent
throttle valve
Bowden cable
adjusting screw
idle stop
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