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CB250
Addendum
NOTE
•
The
pilot
screw
is
factory pre-set
and should
not be
removed
unless the carburetor
is
overhauled.
Turn
the
pilot
screw
in
and
careful
[y
count
the
number
of
turns before
it
seats
lightly.
Make
a
note
of
this
to
use
as
a
reference
when
reinstalling
the
pilot
screw.
If
new
pilot
screw
is
installed,
turn
pilot
screw
out
to
the
initial
opening
before
making
a pilot
screw adjustment
(page
19-20).
Requisite Service
•
Carburetor
removal/installation
(page
19-17)
Procedure
Q'ty
Remarks
Vacuum
Chamber
Disassembly Order
i
•
-
Assembly
ts
in
the reverse order
ot
disassembly.
(1)
Vacuum
chamber
cover
screws
A
4
(2)
Vacuum
chamber
cover
[
IN
W
I
t
At
installation,
hold the
piston
almost
full
open
to avoid
pinching the
diaphragm
with
chamber.
(3)
Spring
\
(4)
Diaphragm/vacuum
piston
(5)
Jet
needle holder
i
(6)
Spring
i
(7)
Jet
needle
i
Float
Chamber
Disassembly Order
Assembly
is
in
the reverse order of disassembly.
18)
Carburetor heater
r
(9)
Collar
>
,i
.
(10)
Float
Chamber
cover
screws
A
At
installation,
first
tighten
the
two
screws on
the
dowel
pin
side.
(11)
Float
chamber
1,
(12)
Float pin
1
(13)
Float
1
For
float level of
inspection,
refer
to
the section
S of
the
Common
Service
Manual.
(14)
Float
valve
(15)
Main
jet
(16)
Needle
jet
holder
(17)
Needle
jet
(18)
Slow
jet
Bystarter
Valve Disassembly Order
Assembly
is
in
the reverse order
of
disassembly.
(19)
Bystarter valve
1
(20)
Spring
1
(21)
Valve nut
1
Pilot
screw Disassembly Order
Assembly
is
in
the reverse order
of
disassembly.
(22)
Pilot
screw
V
(23)
Spring
1
(24)
Washer
1
(25)'
O-ring
1
.
19-19
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