KYMCO ZX Service Manual page 188

17
. EVAPORATIVE/EXHAUST EMISSION
EXHAUST EMISSION RELATED SYSTEM INSPECTION
Clean or replace the air cleaner.
Clean and adjust the carburetor.
Inspect the auto bystarter system.
Clean and inspect the spark plug.
Inspect the ignition system.
EXHAUST EMISSION TEST AND ADJUSTMENT
1. Start the engine and warm up for several minutes. (Engine surface temperature 50 60 )
2. Adjust the idle speed to:: 2000±100rpm
3. Connect the emission tester sampling pipe to the exhaust muffler.
Standard:
CO: 3±0.5%
HC: 7000PPM max.
4. If CO or HC exceeds the specified values, adjust the carburetor air screw (A.S.) until CO and HC are
within the specified standard values.
A.S. Opening: 1¼±½ turns
5. If the adjustment of carburetor makes no difference, inspect exhaust emission related system.
17-3
CONTROL SYSTEM
+100
−50
ZX 50
ZX 50