Cylinder Compression; Drive Belt - KYMCO Downtown 125i 2009 Service Manual

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3
. INSPECTION/ADJUSTMENT

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:
Downtown125i:15 kg/cm²
If the compression is low, check for the
following:
‧Leaky valves
‧Valve clearance too 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.

DRIVE BELT

Remove the left crankcase cover.
Inspect the drive belt
for cracks or excessive wear.
Replace the drive belt with a new
one if necessary and in accordance
with the Maintenance Schedule.
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DOWNTOWN 125i
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