Honda CM400A - Fuel System: High Altitude Adjustment

HONDA
CB4008 '80 CB400T ADDENDUM
VI. FUEL SYSTEM
GENERAL INFORMATION
The C84OOT carburetor bore size has been changed to 30 mm (1.18 in).
.
An accelerator pump circuit has been added.
See Caution and Notes under Pilot Screw Removal and Pilot Screw Adjustment (Page 24-1
1).
Refer to section 20 for carburetor adjustment procedures not described in this section.
CARBURETOR SPECIFICATIONS
Identification mark
Idle speed
Vacuum difference
(at idle)
Float level
Pilot screw initial opening
Venturi bore Primary
Secondary
VB22B
1,200 ? 100 rpm
40
mmHg (1.6 inHg)
15.5 2 0.5 mm (0.61 ? 0.02 in)
See page 24-1
1
13 mm (0.5 in)
30 mm (1.2 in)
CARBURETOR SEPARATION
Remove the carburetors (page 4-21,
Separate the carburetors (page 4-2) noting
that the accelerator pump joint pipe must be
removed.
CARBURETOR ASSEMBLY
install a new O-ring on each end of the ac-
-
celerator pump and fuel joint pipes.
/
Assemble the right and left carburetors noting
ACCELERATOR PUMP JOINT PIPE
the compression spring location.
Install the front and rear stays.
Refer to page 4-8 for carburetor installation.
FLOAT LEVEL INSPECTION
Measure the float level with the float tip just
contacting
;he float valve and the carburetor
inclined 15
-45' from vertical.
FLOAT LEVEL: 15.5 mm
f 0.5 mm
(0.61
t 0.02in)
Replace the float if necessary.
Date of
Issue: Nov., 1979
O HONDA MOTOR CO., LTD.