d02880.fm
MAINTENANCE MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2 / Rev. 0
12-20-00
page 39
October 01/2009
10.3.2) Operating range check
General note Once the proper idling speed has been established, it is necessary to
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.
Procedure To control the operating range above idling the following steps are neces-
sary. See Fig. 20.
Step Procedure
1 Start and warm up engine (See Operators Manual). Select full power and check
that both pressure gauges are registering the same readings.
2 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).
3 Final idle speed adjustment may be required by resetting the idle speed adjust-
ment screws (2).
4 Equal adjustment must be made on both carburetors.
5 Any major adjustments required necessitate replaced verification of all param-
eters mentioned in this procedure.
If the same reading is not made on both gauges.
Step Procedure
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.
Step Procedure
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.
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