Fuel System - Honda NHSO aeroBO 1983 Shop Manual

SERVICE I N FORMATION
TROUBLESHOOTING
THROTTLE VALVE DISASSEMBLY
CARBURETOR REMOVAL
FLOAT/FLOAT VALVE/JETS
DISASSEMBLY
JETS/FLOAT VALVE/FLOAT
ASSEMBLY
SERVICE INFORMATION
G E N E R A L
Gasoline is extremely flammable and
or olio w flames or sparks ill the work area.
•
The fuel tank is equipped with an auto fuel valve that is turned OFF automatically when the engine is stopped.
Use caution when working with gasoline. Always work in
•
•
When disassembling fuel system parts. note the locations
Bleed air from the oil outlet line whenever it is disconnected.
•
TOOLS
Special
Hand vacuum pump
Common
F I oat level gauge
SPE C I F I CATIONS
Venturi dia.
Identification number
Float level
Air screw opening
Idle speed
Throttle grip free play
Main jet
TROUBLESHOOTING
Engine cranks won't start
but
1 . No fuel in tank
2. Fuel not reaching carburetor
3. Too much fuel getting to cylinder
4. Clogged air cleaner
Rich mixture
1. Faulty float valve
2. Float level too high
3. Carburetor jets clogged
Date of Issue: May, 1983
© HONDA MOTOR CO., LTD.
4 -1 F LOAT LEVEL I NSPECTION
CARBURETOR INSTALLATION
4-1
THROTTLE VALVE
4-2
INSTALLATION
4-3
A I R SCREW
HIGH ALTITUDE ADJUSTMENT
4- 5
R E E D VALVE
4-6
AUTO F U E L VALVE
i s
explosive under certain conditions. Work ill a well ventilated area. Do not smoke
a well-ventilated area and away from sparks or flames.
of the 0-rings. Replace them with new ones during assembly.
ST·AH-260-MC7 ( U.S.A. only)
07401-001 0000
Engine idles roughly, stalls or runs poorly
1 . Idle speed incorrect
2. No spark at plug
3. Loss of compression
4. Rich mixture
5. Lean mixture
6. Clogged air cleaner
7. Intake pipe leaking
8. Fuel contaminated
35

4. FUEL SYSTEM

1 6 mm (0.63 in)
PB54D
8.5 mm (0.335 in)
See page 4-1 0
1,800
100 rpm
±
2-6 mm ( 1/8- 1/4 in)
#88
Lean mixture
1. Carburetor fuel jets clogged
2. Fuel cap vent clogged
3. Clogged fuel filter
4. Fuel line kinked or restricted
·
5. Faulty float valve
6. Float level too low
7. Clogged air vent tube
8. Clogged fuel strainer
4-7
4-7
4-9
4-10
4-11
4-12
4-13
4 - 1