CARBURETORS
The Mikuni carburetor has varying
operations
depending upon
varying driving conditions.
It
is
constructed
with
the
float
system,
the
pilot system,
the
main system, and
the
starter
system
(initial starting device).
FLOAT SYSTEM
The
float system
is
designed
to
maintain a
constant
height
of
gasoline during operation.
When
the
fuel flowing from
the
fuel
pump
into
the
float
cham-
ber
through
the
needle valve reaches
the
constant
fuel level,
the
float rises. When
the
buoyancy
of
the
float and
the
fuel pres-
sure
of
the
fuel
pump
balance,
the
needle valve sticks fast
to
the
needle seat, preventing
further
delivery
of
gasoline, there-
by
holding
the
standard level
of
gasoline.
The standard level
of
gasoline
is
set
at
below
30
m/m.±
1
from
the
center
of
the
main bore.
STARTER SYSTEM
The starter system
is
designed
to
make
the
engine
start
quickly
in
cold weather. It
is
constructed
with
functional parts such as
a starter jet, a starter
emulsion
tube,
and a starter plunger, etc.
When
the
engine starts
with
the
throttle
valve closed and
the
starter plunger wide
open,
the
intake negative pressure
of
the
engine works
on
the
fuel nozzle. By
this
negative pressure,
the
fuel
is
measured
by
the
starter
jet, mixed
with
air
in
the
starter
emulsion
tube,
absorbed
into
the
plunger chamber, mixed
again
with
air from
the
starter
air inlet, made
the
most suitable
concentration
of
fuel-air mixture
for
initial starting, and deliver-
ed
to
the
engine
through
the
fuel nozzle.
In
this
starter system,
you
can be sure
of
initial starting
without
any
skill
of
operation, since
both
fuel and air
are
measured and
the
constant
fuel-air mixture ratio
is
always correct.
69
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