3) Carburetor Synchronization; 1) Mechanical Synchronization; 2) Pneumatic Synchronization - Rotax 914 F Maintenance Manual

13.1.3) Carburetor synchronization

1
2
X
3
00039
Pic. 74
Page Date
130 1997 02 01
For smooth idling, synchronization of the throttle valves is necessary. When
synchronizing, slacken both throttle cables.

13.1.2.1) Mechanical synchronization

See Pic. 74.
For synchronous basic throttle adjustment (mechanical synchronization)
proceed as follows:
For new adjustment turn back both stop screws W (throttle valve stop screws)
so that throttle valves close fully.
Close throttle valve fully with throttle lever Q. Adjust stop screw W so that a
gap (X) of 0,1 mm (.004 in.) remains between stop screw W and stop E on
the lever. Now turn stop screw in by 1,5 turn.
Same procedure on the second carburetor.
Under normal circumstances the mechanical carburetor synchroniza-
tion is sufficiently precise.
NOTE: Subsequently adjust cables for simultaneous opening of
the throttles.

13.1.3.2) Pneumatic synchronization

See Pic. 75.
NOTE: Is not possible with drip tray fitted. If a pneumatic synchro-
nization should be absolutely necessary, remove the drip
tray and refit it after synchronization.
With suitable flow meters (synchro tester) or depression gauges both carbu-
retors are adjusted to equal flow rate at idling. Remove the compensating
tube (connection between intake manifolds) and plug the connections.
Remove plug screws W M3,5x5 and connect the depression gauge(s).
At idling adjust the stop screws (see Pic. 74) so that both depression gauges
indicate the same pressure and the idle speed is correct. With alternating
acceleration on each carburetor respectively, the idle mixture screws can be
fine-adjusted to achieve equal response to throttle movement on both
carburetors.
ATTENTION: Respect the indication of the instrument manufacturer.
Refit plug screws M3,5x5.
Main
914 F
Reference Modification no.
- 0 -