ZONGSHEN ZS125-86 Service Manual page 30

2. Maintenance of Evaporative System
It is the role of the professional maintenance staff or the company's after-sales service personnel to
maintain the fuel evaporation device in order to eliminate the failure timely, extend the service life, and
reduce maintenance costs. Thus the best performance of the fuel evaporator can be guaranteed to achieve
the purpose of environmental protection and pollution reduction.
The specific maintenance methods are implemented according to the following steps:
[1] Check the intake negative-pressure hose clamp, intake rubber hose clamp and intake iron pipe
fixing bolts for any looseness. In the above situation, it is necessary to tighten or replace the clamps. [2]
Check the intake negative-pressure hose and intake rubber hose for any aging, leakage or breakage. In the
above situation, it is necessary to replace the intake negative-pressure hose and intake rubber hose.
[3] Check the service condition of the carbon tank and anti-dumping valve. If the carbon tank and anti-
dumping valve are clogged or fails to work properly, it is necessary to replace the carbon tank and anti-
dumping valve.
[4] Check the air cleaner for any clogging or damage phenomenon. If this is the case, it is necessary to
replace the air cleaner. [5] Check the service condition of the catalytic converter. If the catalytic converter
is damaged or fails to work properly, it is necessary to replace the catalytic converter.
3. Refer to Table 3-5 in respect of damage forms, fault phenomena and common
maintenance methods of the evaporative system:
Component
Name
Evaporative
devices
24
Table 3-5: Maintenance of Evaporative System (EVAP)
Component Fault
Damage Form
The evaporating pipe The fuel vapor in the fuel
of the fuel tank is tank cannot be discharged
clogged. smoothly.
The fuel vapor in the fuel
The anti-damping valve tank cannot be discharged
is clogged. into the carbon tank
smoothly.
The fuel vapor in the fuel
The anti-damping valve tank cannot be discharged
is broken. into the carbon tank
smoothly.
The connecting hose
The inlet leaks.
becomes loose.
The fuel vapor cannot be
The carbon tank is
discharged into the carbon
clogged.
tank smoothly.
The carbon tank is
The carbon tank leaks.
broken.
The catalytic device is
----------------------
damaged
Motorcycle Fault
Phenomenon Phenomenon
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
The oil vapor is discharged
into the atmosphere
directly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
The oil vapor is discharged
into the atmosphere
directly.
The motorcycle emission
cannot reach State III
standards
Maintenance Method
Dredge the evaporating
pipe or replace the fuel
tank
Dredge or replace the
anti-damping valve.
Replace the anti-
damping valve.
Replace the connecting
hose.
Dredge or replace the
carbon tank.
Replace the carbon tank
Replace the catalytic
device