Carburetor Actuation; 1) Pneumatic Synchronization; 2) Mechanical Synchronization; Actuating Of Starting Carburetor - Rotax 912-UL Repair Manual

7 .16) Carbu retof actuation
The throttle valves are actuated by separate cables.
The throttle lever must allow two cable connections and provide an action navel of 65 mm (2
V2"). The actuating force is 6 N (1,32 lb.). For smooth idling, synchronization at the throttle
valves is necessary. When synchronizing,loosen both throttle cables.
The mixture screws are set to the same open position (primary setting 1 1/4 turn open).
There are two possible ways to synchronize the carburetors.
7 .L6.1) Fneumatic synchronization
With suitableflowmeters (synchrotester) ordepression gauges both carburetors are
adjusted to equal flow ratc at idling.
With alternating accelerationoneach carburetorrespectively, the mixture screwscan
be fine-adjusted to achieve equal response to thronle movement on both carbureton.
7 .L6.2) Mechanical synchronization
Turn back stop screws so that throttle valves close fully. After that turn stop screw
in again until it touches the stop on the lever. Now, from this basic position adjust both
stop screws equally till you reach the correct idle speed.
For adjusting the mixture screws proceed as abovc.
Subsequently adjust cables for simultaneous opening of the throttles.
7.17) Starting-carburetor actuation
The starting carburetors are actuated by separate cablcs too. The action travel on the cable is
around 23 mm (15/16"). The actuating force is ryprox. 16 N (3,5 lb.). Ensure the complete
closing of the starting carburetor.