Honda CX500 1978 Shop Manual page 298

HONDA
CX500
'81 ADDENDUM
--
3. FUEL SYSTEM
WORKING PRACTICE
The fuel valve is equipped with a fuel line diaphragm. After carburetor overhaul, it is necessary t o crank the engine for 2-3
seconds, three times with the throttle fully closed t o fill the float chambers.
For carburetor adjustments, refer t o section 4 and the '80 addendum.
The pilot screw is factory pre-set and should not be removed unless the carburetor is overhauled.
TROUBLE SHOOTING
Fuel Line Diaphragm
Fuel not reaching carburetor
1. Fuel line diaphragm vent tube clogged.
L
2. Fuel line diaphragm vacuum tube clogged.
3.
Clogged fuel line diaphragm.
4. Clogged fuel line diaphragm check valve.
SPECIFICATIONS
[
I
Canada Model
Venturi diameter
Idle speed
Fast idle speed
Float level
Pilot screw opening
Main jets
I
I
Throttle grip free play
CX5OO CUSTOM
ITEM
34 mm (1.3 in)
1,100+ l 0 0 r p m
1,100
-
1.500rpm
1 5 . 5 i 1 mm
See page 23-9
Primary
#
78
Secondary #I 15
2
-
6 mm (118
-
114 in)
CX500 DELUXE
VB25A [VB25B1
Identification mark
Date of Issue: January, 1981
o
HoNDA MOTOR CO., LTD.
24-7
VB28A [VB28Bl