Operating Range Check - Rotax MML-912 Maintenance Manual

10.3.2) Operating range check

Once the proper idling speed has been established, it is necessary to
General note
check the operating range above the idle speed.
First establish that the engine is developing full take-off performance or
take-off rpm when selected in the cockpit. Then the setting of the operat-
ing range (idle to full throttle) can be checked or adjusted.
To control the operating range above idling the following steps are neces-
Procedure
sary. See
Step
1
2
3
4
5
Effectivity: 912 Series
Edition 2 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Fig. 20.
Start and warm up engine (See Operators Manual). Select full power and check
that both pressure gauges are registering the same readings.
If the same reading is not made on both gauges.
Step
1 Shut down the engine.
2 Check that carburetor actuation effects full travel and that
starting carburetors (choke) are in the full off position.
3 If necessary, fit/modify the carburetor actuation as required
to achieve full power on both carburetors.
Once full power has been established on both carburetors, retard the throttle
and observe the pressure gauge settings. The pressure gauges should show
the same reading for both carburetors.
NOTES: Discrepancies must be compensated for by adjusting the off
idle adjustment (1).
Step
1 Shut down the engine.
2 Loosening the locknut on the bowden cable and adjusting the
off idle adjustment.
3 Tightening the locknut.
4 Re-testing the engine.
Final idle speed adjustment may be required by resetting the idle speed adjust-
ment screws (2).
Equal adjustment must be made on both carburetors.
Any major adjustments required necessitate replaced verification of all param-
eters mentioned in this procedure.
Procedure
Procedure
Procedure
12-20-00
page 39
October 01/2009