KYMCO Zing 125 Service Manual page 174

19
. EVAPORATIVE/EXHAUST EMISSION
CONTROL SYSTEM
CARBURETOR ADJUSTMENT
1. Start and warm up the engine for five
minutes. Adjust the pilot screw to find
the highest idle speed.
2. Turn the throttle stop screw to obtain the
specified idle speed of 1600±100rpm.
3. Rotate the throttle grip slightly to make
sure the idle speed is maintained within
the specified range.
4. If the engine misses or runs erratic,
repeat the above steps.
Pilot Screw Opening: 2±½ turns
SPARK PLUG INSPECTION/
CLEANING
1. Remove the spark plug.
2. Check the spark plug for wear, damage
and fouling deposits. Clean any fouling
deposits with a spark plug cleaner or a
wire brush.
Specified Spark Plug: DR8EA
Spark Plug Gap: 0.6～0.7mm
＊ ＊ ＊ ＊
When installing, first screw in the spark
plug by hand and then tighten it with a
spark plug wrench.
IGNITION SYSTEM INSPECTION
＊ ＊ ＊ ＊
The CDI unit is not adjustable.
If the ignition timing is incorrect, check
the ignition system.
1. Remove the ignition timing eye hole
cap on the left crankcase cover.
2. Use a timing light to check if the index
mark on the left crankcase cover aligns
with the "F" mark on the flywheel. If no,
replace the CDI unit with a new one.
Ignition Timing: 15°±1.5°/1600±100rpm
19-11
Throttle Stop Screw
Side Electrode
Center Electrode
Eye Hole
Washer