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ENGLISH
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:
Table 3-5: Maintenance of Evaporative System (EVAP)
Component
Name
Damage Form
Component Fault
Phenomenon
Motorcycle Fault
Phenomenon
Maintenance Method
Evaporative
devices
The evaporating pipe
of the fuel tank is
clogged.
The fuel vapor in the fuel
tank cannot be discharged
smoothly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
Dredge the evaporating
pipe or replace the fuel
tank
The anti-damping valve
is clogged.
The fuel vapor in the fuel
tank cannot be discharged
into the carbon tank
smoothly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
Dredge or replace the
anti-damping valve.
The anti-damping valve
is broken.
The fuel vapor in the fuel
tank cannot be discharged
into the carbon tank
smoothly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
Replace the anti-
damping valve.
The connecting hose
becomes loose.
The inlet leaks.
The oil vapor is discharged
into the atmosphere
directly.
Replace the connecting
hose.
The carbon tank is
clogged.
The fuel vapor cannot be
discharged into the carbon
tank smoothly.
Too high air pressure in
the fuel tank causes the oil
vapor to be discharged into
the atmosphere directly.
Dredge or replace the
carbon tank.
The carbon tank is
broken.
The carbon tank leaks.
The oil vapor is discharged
into the atmosphere
directly.
Replace the carbon tank
The catalytic device is
damaged
----------------------
The motorcycle emission
cannot reach State III
standards
Replace the catalytic
device
