8-
1-2
PILOT SYSTEM
The pilot system feeds the fuel
to
the engine during idling and low-speed operation.
The fuel is fed through the
main
jet to the pilot jet, where it is metered, and mixed
with
the air metered by.the pilot air jet.
The fuel-air mixture is fed to the engine through the pilot outlet and the by-pass.
During
engine
idling,
the fuel is mainly fed from the pilot outlet.
8-1
-3
MAIN
SYSTEM
The main system feeds the fuel to the engine during medium- and high-speed operation.
The fuel is metered by the
main
jet and fed to the main nozzle.
The
air metered by the main
air
jet is mixed
with
the fuel
through the bleed holes in the main nozzle, and the mixture
is
atomized out of the main bore. It is mixed again with the
air
taken through the air cleaner into an optimum fuel-air mixture, which
is
supplied to the engine.
8-
1-4
CHOKE
The choke
is
used for easy start in the cold season. When the recoil starter
is
pulled
with
a
closed choke, the negative pres-
sure applied to the main nozzle increases
and
draws much fuel accordingly; thus easily start up the engine.
8-2
DISASSEMBLY
and
REASSEMBLY
Apart
from
mechanical failures, most
of
carburetor troubles are caused by
an
incorrect mixing ratio, which may arise mainly
due to a clogged up air or fuel passage in jets, or fuel level variations.
In
order to assure proper
flow
of
air
and fuel, the car-
buretor must be kept clean at all times. The carburetor
(See
Figs.
57
and
58.)
disassembly
and
7
I
8
-4gJ
12
A
reassembly procedures are
as
follows:
29
"i
134
7
l0e
8*
l1
"---@
12
4
Fig.
57
(EY
15,201
Fig.
58
(E
Y28)
-43
-
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