Kymco Agility 50 - Service manual > Carburetor idle speed

• The engine must be warm for accurate idle speed inspection and adjustment.

Remove the inspection cover.

Warm up the engine before this operation.

Start the engine and connect a tachometer.

Turn the throttle stop screw to obtain the specified idle speed.

Idle Speed: 1900100rpm

When the engine misses or run erratic, adjust the pilot screw.

IGNITION TIMING

The CDI unit is not adjustable. If the ignition timing is incorrect, check the ignition system.

Remove the right of the fan cover.

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.

Also use a timing light to check the advance.

Raise the engine speed to 4,000rpm and the index mark on the crankcase cover should be aligned with the advance mark on the flywheel.

CYLINDER COMPRESSION

Warm up the engine before compression test.

Remove the met-in box and center cover.

Remove the spark plug.

Insert a compression gauge.

Open the throttle valve fully and push the starter button to test the compression.

Compression: 16kg/cm2rpm

If the compression is low, check for the following:

• Leaky valves
• Valve clearance to 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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