4) Idle Speed Adjustment - Rotax 914 F Maintenance Manual

2

13.1.4) Idle speed adjustment

00040
1
Pic. 76
Modification no.
- 0 -
x 0,1
bar
00040
See Pic. 76.
Basic adjustment:
Close mixture control screw Q completely by turning clockwise and then
open up again by 1 1/2 turn.
Basic adjustment is 1 1/2 turn.
Fine adjustment on engine:
NOTE: Idle adjustment is not possible with drip tray fitted. If an idle
adjustment is absolutely necessary, remove the drip trays
and refit them after adjustment.
Adjusting of the idle speed should always be done at operating temperature
of engine.
First, close mixture control screw Q completely by turning clockwise and
then open up again by 1 1/2 turn (like for basic adjustment).
NOTE: Turning idle mixture control screw in clockwise direction
results in a leaner mixture and turning anti-clockwise in a
richer mixture.
Starting from the basic setting turn the mixture control screw until
reaching the maximum engine rpm. The optimum setting is the
middle between the two positions at which an rpm. drop is noticed.
Finalize the setting of the idle speed by fine adjusting with idle
screw (see Pic. 74) and, if necessary, by adjusting again mixture
control screw.
ATTENTION: If satisfactory idle ajdustment is not possible, an additional
pneumatic synchronization is necessary.
Reference
2
1
x 0,1
bar
Pic. 75
Main
914 F
Date Page
1997 02 01 131