Ignition Timing; Cylinder Compression - KYMCO Bet & Win 125 User Manual

3
. INSPECTION/ADJUSTMENT

IGNITION TIMING

• The CDI unit is not adjustable.
• If the ignition timing is incorrect, check
the ignition system,
Remove the timing hole cap.
Check the ignition timing with a timing light.
When the engine is running at the specified
idle speed, the ignition timing is correct if the
"F" mark on the flywheel aligns with the
index mark on the crankcase cover.
Also use a timing light to check the advance.
Raise the engine speed to 4,000rpm.
The index mark should be between the
advance marks.

CYLINDER COMPRESSION

Warm up the engine before compression test.
Remove the center cover and spark plug cap.
Remove the spark plug .
Insert a compression gauge.
Open the throttle valve fully and push the
starter button to test the compression.
Compression: 15±2kg/cm_
If the compression is low, check for the
following:
Leaky valves
Valve clearance to small
Leaking cylinder head gasket
Worn pistons
Worn piston/cylinder
If the compression is high, it indicates that
carbon deposits have accumulated on the
combustion chamber and the piston head.
3-7
Bet & Win 125/150
Timing Hole Cap
"F" Mark
Timing Light
Compression Gauge