CARBURETORS (Can't.)
The point
of
the
jet
needle
is
tapered
to
adjust the
flow
of
fuel-
air mixture in accordance
with
the opening
of
the
throttle
valve.
During high
speed
driving (the opening
of
the
throttle
valve
is
above 3/4), the fuel
is
measured
by
the main
jet
and
mixed
with
the air measured
by
the air
jet
to
make a fine spray
of
fuel-air mixture
of
good
quality
for
delivery
to
the engine.
ADJUSTMENTS
When
the engine
has
dual carburetors,
it
is
the prerequisite
for
full
engine performance
to
maintain the equal operation
of
each
carburetor. The following items should
be
followed
cautiously
and accurately.
ADJUSTMENT OF
THROTTLE
CABLE
With your
eye
or plug
gauge,
adjust the opening
of
each
throttle
valve
with
the
throttle
cable attached and
the
throttle
open. With
your
eye, you
can
adjust accurately
by
matching
the corner
of
the cutaway
of
the
throttle
valve
with
the
upper
surface
of
the main bore.
After
adjustment,
be
sure
to
fasten
the
cable adjuster lock nuts
as
well
as
the starter wire.
ADJUSTMENT
OF
IDLING
AND
SYNCHRONIZATION
(a)
Set the air
screw
of
each
carburetor at the standard
return number
and
then fasten the
throttle
stop screw
of
each
carburetor evenly, setting the number at about 1,000
RPM
which
is
a
little
higher than normal idling
speed.
(b)
Warm up the engine completely.
(c)
Find
out
and
set
the position where the number
of
RPMs
of
the engine becomes maximum
by
opening
or
closing the air
screws
one
by
one about 1/2
each
time. In this
case,
be
sure
to
use
a tachometer.
(d) Return
each
screw
of
the
throttle
valve evenly and
set
at
the
normal number
of
rotations
of
idling.
71
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