Lifan 100-C 2012, Руководство пользователя

Страница: 15 / 22

PRINCIPLE OF SECONDARY INLET SYSTEM &
CRANKCASE GAS RECIRCULATION SYSTEM (EP)
Secondary Inlet System (Fig. 25)
WORKING PRINCIPLE Lead the fresh air into the exhaust pipe so as to
increase oxgen, then re-combust unburnt hydrocarbor (HC) and carbon mon-
oxide (CO) by virtue of exhaust temterature before allowing them to enter air,
thus, HC & CO content in the exhaust gas will decrease. The effect of HC &
CO decrease in the secondary inlet system depends upon oxygen concentra-
tion and temperature in the exhaust passage. As a rule, HC & CO content
after re-oxyenated can decrease by 30 - 60 %. So oxidation of HC & CO needs
more oxygen, i. e. supply more fresh air into exhaust passage, and temparature
must achieve up 400
(for combusting HC) to 500 (for combusting CO).
The secondary inlet system functions by means of exhaust pressure impulse
and a gulp valve.
Secondary gas has an effect on HC & CO, but it is related to A/F of the engine.
NOTE The gulp control valve should be checked periodically. It is recom-
mended that the job is done at least once every 3-month service.
Crankcase Gas Recirculation System
WORKING PRINCIPLE A gas/fuel separator is installed between the
crankcase and air cleaner passage. When the engine is running, the separated
Check for smooth ratation of the throttle
grip from the fully open to the fully closed
position at both full steering position.
Measure the throttle grip free play at the
throttle grip flange. The standard free play
should be approx. 2-6mm.To adjust the free
play, loosen the lock nut, turn the adjuster.
Adjustment over, fasten the lock nut.
air enters into the air cleaner and carburetor via the separator, then returns to
the combusting chamber, avoid exhaust gas in the crankcase directly coming
into air, therefore decrease atmospheric pollution.
NOTE The gas/oil separator should be cleaned periodically. It is recom-
mended that the job is done at least once every 3-month service.
OPERATION OF THROTTLE
(Fig. 26)
Fig. 25
The carburetor is installed between the engine and air cleaner.
NOTE The carburetor has been set accurately in factory. The user only
needs to adjust idle speed after the engine is warmed up.
Adjust idle speed with the throttle stop screw to set idle speed at about
1500r/min. Turn the screw in direction A will increase idle speed, in direc-
tion B decrease idle speed.
When the engine has no idle speed or runs a a decreased speed, set the
throttle stop screw in the middle between the two limit
positions to help mis air and fuel.
CAUTION Since the carburetor
is a precision apparatus, don’t dis-
assemble it without the profes-
sional knowledge.
Fig. 26
Locknut
Adjuster
IDLE SPEED OF CARBURETOR (EP)
( Fig. 27)
Fig. 27
Throttle stop
screw
１００－Ｃ（ＥＮＧＬＩＳＨ）ＯＫ．ｐ６５
2012-9-12, 16:27 15