Fuel System; Engine Crank But Won't Start - Honda CX650C 1983 Shop Manual

SERVICE INFORMATION
TROUBLESHOOTING
CARBURETOR REMOVAL
CARBURETOR SEPARATION
CARBURETOR ASSEMBLY
VACUUM CYLINDER
DISASSEMBLYllNSPECTIBN
FLOAT CHAMBER DISASSEMBLY
AIR
CUT-OFF VALVE
DISASSEMBLY
ACCELERATOR
PUMP DISASSEMBLY
COMPONENT ASSEMBLY
FLOAT LEVEL
FAST IDLE ADJUSTMENT
ACCELERATOR PUMP ADJUSTMENT
CARBURETOR INSTALLATION
PI LOT SCREW ADJUSTMENT
HIGH ALTITUDE ADJUSTMENT
FUEL TANK
AIR CLEANER CASE
SERVICE INFORMATION
G E N E R A L
Use caution when working with gasoline. Always work in a well-ventilated area and away from sparks or open flames.
When disassembling fuel system parts, note the locations of the 0-rings. Replace them with new ones or7 reassembly.
@
The float bowls have drain plugs that can be loosened to drain residual gasoline.
SPECIFICATIONS
. . . - . - . p -
- - . . . . - p . - - - - p . - - . . .
. -
Venturi diameter 35 mm (1.4 in) Idle speed
- . . - p - . . - - - . - -
Identification No. VB2AB
Vacuum pressure difference
40 mm (1.6 in) Hg
Float level
~ ~ ~ w ~ e r r ~ ~ : e o ' s ~ . . ~ ~ ~ ~
2 - 6 m m
Pilot screw See page 4-1 3
(1/8
-
l / 4 in)
Throttle grip free play
TROUBLE VALVE TOOLS
Carburetor front and rear stay screws
2.8- 4.2 N.m (0.28-0.42 kg-m, 2-3 ft-lb)
Special
Carburetor pilot screw wrench 07908-4220201
Fuel valve lock nut
Hand vacuum pump A973X-041 -XXXXX
20-25 N.m (2.0-2.5 kg-m, 14-18 ft-lb)
(U.S.A. only)
or ST-AH-260-MC7
Common
Float level gauge 07401 -001 0000
Engine Cranks But Won't Start
Lean Mixture:
@
No fuel in tank.
e Carburetor fuel jets clogged.
e No fuel getting to cylinders.
(B
Vacuum piston stuck closed.
7-00
much fuel getting t o cylinders. 63
Fuel cap vent blocked.
@
No spark at plugs - ignition malfunction.
Fuel filter clogged.
Fuel flow restricted.
@
Fuel line blocked.
Engine Idles Roughly,
Stalls,
or Runs Poorly
@
Float valve faulty.
co Idle speed incorrect.
*
Float level too low.
@
Ignition malfunction.
@
Fuel flow restricted.
ad
Low compression.
Rick Mixture:
~4
Rich mixture.
@
Choke stuck closed.
Lean Mixture.
*
Float level set too high or float sticking.
e Air cleaner clogged. Carburetor air jets clogged.
cp
Air leaking into intake pipe.
@
Sticking float.
a,
Fuel flow restricted. Dirty air cleaner.
Fuel contaminated. Fuel
flow
restricted:
e Carburetors not synchronized. Fuel strainer or fuel valve clogged.
e Faulty vacuum piston.
@
Fuel tank cap breather hole clogged.
Vacuum tube or air vent tube clogged.
*
Fuel valve diaphragm faulty.
Date of Issue: December, 1982
O HONBA MOTOR
Co.,,
LTD.