CARBURETORS (Can't.)
MAIN
SYSTEM
(a)
Be
sure
to
use
proper tools
for
disassembling the main jet
and the needle jet, and
be
careful
not
to
make scratches when
reassembling. (Excessive tightening
is
a
cause
of
disfigure
or
damage.)
FLOAT
SYSTEM
(a)
Be
careful
not
to
bend the
float
guide pin in handling.
If
bent, the pin
causes
malfunctioning
of
the float.
(b) The needle valve
can
be
disassembled
into
the
valve
seat
and
the
float
valve. When
it
is
replaced
because
of
wear
or
scratches,
use
the complete needle valve assembly.
(c)
Every
time
overhaul
is
performed, replace the
float
cham-
ber packing
with
a new one.
DISORDER
AND
ADJUSTMENT
A carburetor
is
a
vessel
with
a
lot
of
precision jets
and
a con-
stant
fuel level.
It
is
so
constructed
that
when the negative
pressure
of
intake
of
the engine functions, proper concentration
of
fuel-air
mixture
is
obtained
for
the operation
of
the engine.
Accordingly, except
for
the mechanical disorders, most carbure-
tor
problems
are
caused
by
an
abnormal concentration
of
the
fuel-air
mixture
due
to
accumulated
dirt
and dust
and
wear
of
parts.
Disorders
of
the engine due
to
an
abnormal fuel-air
mixture
are
as
follows:
When
the fuel-air
mixture
is
too
rich:
(
1)
The rotations sound overwrapped
and
intermittent.
(2) When the choke
is
opened, the condition worsens.
(3)
When
the engine
is
warmed up, the condition worsens.
(4) The ignition
plug becomes dark
and
dusty.
(5) Exhaust
gas
is
rich.
74
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