ReferenceModification no.
- 0 -
Page
103
Date
1997 02 01
Main
914 F
01477
12.3.15)Checking of the carburetor
See also Chapter 13.1.2)
12.3.15.1) Float chamber
Remove float chamber, clean inside and check gasket. Insert both floats on
the guides in float chamber. When the floats rest on the distance sleeve, the
single floats must still be freely moving. They must not block on the float
chamber wall. Check guide sleeve pressed into the float. If necessary, clean
the complete inside of the carburetor. If contamination is suspected, check the
float needle valve too.
12.3.15.2) Inspection of the float needle valve
Only necessary in case of irregularities.
12.3.15.3) Venting of the float chamber
Every disturbance of the float chamber venting influences the carburetor- and
engine function and must be avoided therefore. Ensure free passage of vent
line. Prevent kinks. See Chapter 13.3.2) and 13.1.11).
12.3.15.4) Calibration
Normally, carburetor calibration must not be changed. Size of main jet is
determined on the dyno at an altitude of 300 m (1000 ft.) above M.S.L.
â–² WARNING: Correction of the main jetting only at Aeronautical Service
Centres or by authorized test staff to specifications from
ROTAX. See Chapter 11.3).
12.3.15.5) Carburetor synchronization
The throttle valves have to open synchronously to achieve a steady run on all
four cylinders.
12.3.15.6) Adjusting of the idle speed
Adjusting of the idle speed should always be done at operating temperature
of engine. Under normal circumstances no modification of the idle adjustment
is necessary. If need be, the idle air screw can be turned until reaching an
acceptably smooth running of engine.
â—† NOTE: Turning idle mixture control screw in clockwise direction
results in a leaner mixture, and turning anti-clockwise in a
richer mixture.
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