Honda CX500 1978 Shop Manual page 37

HONDA
CXSOO
I
.
FUEL SYSTEM
SERVICE INFORMATION 4- 1 COMPONENT ASSEMBLY 4-8
TROUBLESHOOTING 4- 1 FLOAT LEVEL ADJUSTMENT 4-9
CARBURETORREMOVAL 4-2 FAST IDLE ADJUSTMENT 4-9
CARBURETOR SEPARATION 4-3 CARBURETOR INSTALLATION 4-9
CARBURETOR ASSEMBLY 4-4 PILOT SCREW INITIAL SETTING 4-10
VACUUM CYLINDER
DISASSEMBLYIINSPECTION 4-5
FUEL TANK 4-1 1
FLOAT CHAMBER DISASSEMBLY 4-6 AIR CLEANER CASE 4-1 1
AIR CUTOFF VALVE CRANKCASE BREATHER SYSTEM 4-12
DISASSEMBLY 4-8
SERVICE INFORMATION
WORKING PRACTICE
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 O-rings. Replace them with new ones on
reassembly.
The float bowls have drain plugs that can be loosened to drain residual gasoline.
SPECIAL TOOL
FLOAT GAUGE 07401-0010000
SPECIFICATIONS
TROUBLESHOOTING
.-
Engine Cranks But Won't Start
1. No fuel in tank
2. No fuel getting to cylinders
3. Too much fuel getting to cylinders
4.
No spark at plugs
-
ignition malfunction
5.
Air cleaner clogged
Engine Idles Roughly, Stalls, or Runs Poorly
1.
ldle speed incorrect
2.
Ignition malfunction
3. Low compression
4.
Richmixture
5. Lean Mixture
6.
Air cleaner clogged
7.
Air leaking into manifold
8.
Fuel contaminated
9.
Carburetors not synchronized
10.
Faulty vacuum piston
Lean Mixture:
1.
Carburetor fuel jets clogged
2. Vacuum piston stuck closed
3.
Fuel cap vent blocked
4. Fuel filter clogged
5. Fuel line blocked
6. Float valve faulty
7.
Float level too low
Rich Mixture:
1.
Choke stuck closed
2.
Float level set too high or float sticking
3. Carburetor air jets clogged
4.
Sticking float
5. Dirty air cleaner
ITEM
Venturi diamet~
Setting mark
Float level
Pilot screw
Idle speed
Vacuum pressure difference
between carburetors
Throttle grip free play
Date of Issue: January,
1978
OHONDA MOTOR CO., LTD.
4- 1
-
STANDARD
35 mm
(1.38
in.)
VB26A
15.5 mm (0.61
in.)
See Page 4-1 0
1,100i
l 0 0 r p m
4~
, ,
Hg
2
-
6 mm
(118-114
in.)