Idle Speed Adjustment - Rotax 912 Series Maintenance Manual

10.5) Idle speed adjustment

General note See
Idle adjustment Always carry out idle speed adjustment when the engine is warm.
- Basic adjustment of the idle speed is first effected using the idle speed
Optimizing en-
Necessary only if not taken care of at synchronization.
gine running
Step
1
2
3
4
Effectivity: 912 Series
Edition 3 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Fig. 21.
If satisfactory idle speed adjustment cannot be
NOTICE WARNUNG
achieved, inspection of the idle jet or additional pneu-
matic synchronization will be necessary.
See chap. 12-20-00 section: 10.3).
adjustment screw (2) of the throttle valve.
See chap. 12-20-00 section: 10.2).
Close idle mixture screw (4) by turning clockwise to screw in fully and then
opening again by 1.5 turns counter clockwise.
Starting from this basic adjustment, the idle mixture screw (4) is turned until
the highest idle speed is reached.
The optimum setting is the middle between the two positions at which an rpm.
drop is noticed.
Then readjustment of the idle speed is carried out using the idle speed adjust-
ment screw (2) and if necessary, by slightly turning the idle mixture screw
again.
NOTES: Turning the idle mixture control screw in clockwise direction
results in a leaner mixture and turning counter clockwise in
a richer mixture.
Procedure
12-20-00
September 01/2012
page 43