Aeon AT56-69E, Service Manual, Page: 117 / 196

FUEL AND CARBURETOR
6-7
FLOAT HEIGHT ADJUSTMENT
1. Hold the carburetor in an upside down position.
2. Measure the distance from the front mating surface of the
float chamber (gasket removed) to the top of the float.
3. The float arm should be resting on the needle valve, but not
compressing it.
NOTE: If the float is past parallel with the mating
surface, the carburetor has likely been tilted back too
far and the float tongue is compressing the needle
valve pin.
3. Measure the height from the float bowl-mating surface to
the top of step of the float as shown. Both sides of float should
be parallel to each other. The measurement should be made at
the mid-point on top of the float using Float Adjustment Tool
or a caliper. When measuring the height, verify the inlet needle
valve spring is not compressed.
Float Height:
Parallel to Gasket Surface 15 ± 1mm
4. If the float height is not within the specification,
inspect the valve seat and needle valve.
FUEL LEVEL TEST
A fuel level test can be performed if the drain hose fitting is
accessible. Be sure to re-attach the bowl drain hose after
performing the test. A fuel level test allows you to observe the
height of the fuel in the float bowl without removing the
carburetor. The fuel level can be observed with the engine
either running or shut off, however, engine must run briefly to
allow fuel level to stabilize..
1. Attach a clear line to drain fitting. Be sure line fits tightly on
fitting. Position hose along side of carburetor as shown.
2. Open bowl drain screw by turning counterclockwise
approximately two turns. Start and run engine for 3 to 5
seconds to allow fuel level to stabilize in the line. If level is out
of specification, remove carburetor and inspect inlet needle
and seat, float height, passages, etc.
NOTE: If a line was removed to perform this
procedure, it must be replaced.
Fuel Lever: 4.5mm
Above the float chamber mating surface.