KYMCO Downtown 300i ABS User Manual

20. EVAPORATIVE EMISSION CONTROL SYSTEM
Downtown 300i ABS
EVAPORATIVE EMISSION CONTROL SYSTEM FUNCTION
FOREWORD:
The Evaporative Emission Control System is abbreviated to E.E.C. System. This device collects
the fuel vapor from the fuel tank and then the fuel vapor is drawn into the engine for re-burning to
avoid air pollution caused by the fuel vapor diffused into the air.
FUNCTION
Item
Purpose Function
Pur
g
e Control Valve
Control va
p
orized HC fro
m
fuel tank not to diffuse into
the air.
The charcoal canister absorbs va
p
orized HC
from the fuel tank. When the en
g
ine is
runnin
g
and the
p
ur
g
e control valve is o
p
en,
the fuel va
p
or in the charcoal canister is
drawn into the engine for re-burning.
Charcoal Canister
Absorb and store the
va
p
orized HC from the fuel
tank and carburetor.
The va
p
orized HC is absorbed in the charcoal
canister and the s
p
ecified volume of HC in
the emission should not exceed 2g.
P.C.V. System
Com
p
letel
y
recover the HC
from blow-b
y
g
as in the
crankcase for re-burning.
Throu
g
h the P.C.V. s
y
stem, the blow-b
y
g
as
from the crankcase is se
p
arated into fuel
va
p
or and fuel and then drawn into the
cylinder for re-burning.
TROUBLESHOOTING
Engine loses power or runs erratic at idle speed
1. Clogged P.C.V. system
2. Clogged air cleaner
3. Faulty purge control valve
4. Loose or broken E.E.C. system tubes
Engine idles or accelerates roughly
1. Faulty fuel cut-off valve
2. Faulty purge control valve
3. Clogged or faulty charcoal canister
20-2

KYMCO Downtown 300i ABS Specifications

General

Brand	KYMCO
Model	Downtown 300i ABS
Category	Motorcycle
Language	English