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2. INSPECTION/ADJUSTMENT QUANNON 125
IGNITION TIMING
· The CDI unit is not adjustable.
· If the ignition timing is incorrect, check
the ignition system.
Remove the ignition timing eyes hole cap on
the left crankcase cover.
Eyes Hole
Check the ignition timing with a timing light.
When the engine is running at idle speed,
the ignition timing is correct if the index mark
on the left crankcase cover aligns with the
"F" mark on the flywheel.
Timing Light
"F" Mark
CYLINDER COMPRESSION
Warm up the engine before compression
test.
Stop the engine, then remove the spark plug
and insert a compression gauge.
Open the throttle valve fully and crank the
engine with the starter motor or kick lever.
Measure the compression.
Compression: 13kg/cm
Compression Gauge
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.
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