BRP-Rotax
MAINTENANCE MANUAL LINE
IDLE SPEED ADJUSTMENT
General note
ATTENTION
IF satisfactory idle speed adjustment cannot be achieved, inspection of the idle
jet or additional pneumatic synchronization will be necessary.
See Chapter 12-20-00 section Pneumatic synchronization.
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 adjustment
screw of the throttle valve. See Chapter 12-20-00 section Mechanical synchronization.
Optimizing en-
gine running
Necessary only if not taken care of at synchronization.
Step
Procedure
1 Close idle mixture screw by turning clockwise to screw in fully and then
opening again by 1.5 turns counter clockwise.
2
Starting from this basic adjustment, the idle mixture screw is turned until the
highest idle speed is reached.
3 The optimum setting is the middle between the two positions at which an
rpm. drop is noticed.
4
Then readjustment of the idle speed is carried out using the idle speed ad-
justment screw and if necessary, by slightly turning the idle mixture screw
again.
NOTE
Turning the idle mixture control screw in clockwise direction results
in a leaner mixture and turning counter clockwise in a richer mixture.
Effectivity: 912 Series
Rev. 0
12–20–00
Page 37
January 01 2020
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