Engine Oil/Final Reduction Gear Oil - KYMCO MX 125 Service Manual

3
. INSPECTION/ADJUSTMENT
Remove the timing hole cap.
Check the ignition timing with a timing
light.
When the engine is running at idle speed,
the ignition timing is correct if the "F" mark
on the flywheel aligns with the index mark
on the crankcase.
CYLINDER COMPRESSION
Warm up the engine before compression
test.
Remove the spark plug.
Insert a compression gauge.
Open the throttle valve fully and push the
starter button to test the compression.
Compression: 16kg/cm²
If the compression is low, check for the
following:
- Leaky valves
- Valve clearance too small
- Leaking cylinder head gasket
- Worn piston rings
- Worn piston/cylinder
If the compression is high, it indicates that
carbon deposits have accumulated on the
combustion chamber and the piston head.
Timing Hole Cap
3-7
MX'er SYSTEM
Timing Light
Compression Gauge
ENGINE OIL
OIL LEVEL