CARBURETORS (Con't.)
(e)
Find
out
and
set
the position once more where engine
rotation
becomes maximum
by
opening
or
closing the air
screws
one
by
one about
1/16
each
time.
(f)
If
the
number
of
rotations
has
changed
in
the adjustment
mentioned in paragraph (e),
set
once more at the normal
number
of
rotations
of
idling
by
means
of
each
throttle
stop
screw.
(g)
Remove the plug cap
of
each
cylinder and check whether
the down percentage in the number
of
rotations
of
the engine
is
constant
or
not
at
that
time.
If
not,
return the
throttle
stop
screw
on
the side where the
down
percentage
is
larger and adjust
so
as
to
make the
down
percentage constant.
(h) In the last step, operate
for
5-10 minutes
by
idling.
If
the rotations
of
the engine
are
normal during
that
time, the
adjustment
is
complete.
If
abnormal, remove the ignition plug
and check the
condition
of
combustion.
If
the combustion
seems
to
be
somewhat over, return the air screw, and
if
some-
what under, fasten the air screw.
ADJUSTMENT IN ACCORDANCE WITH THE ALTITUDE
AND THE TEMPERATURE
The density
of
the
air varies according
to
the
altitude
and the
temperature.
It
is
necessary
that
the delivery
of
the fuel in the
carburetor should
be
changed according
to
the change
of
the
density
of
the air.
INITIAL
STARTING
For initial starting in cold weather, start the engine
with
the
choke
full
open. On
this
occasion,
it
is
necessary
to
be
careful
not
to
open the
throttle
valve.
If
you open the
throttle
valve,
the
negative pressure
working
for
the injection
of
the
fuel
for
72
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