Kymco Agility 50 - Service manual > Cylinder head removal

Remove the camshaft.

Remove the carburetor. Remove the exhaust muffler.

Remove the carburetor intake manifold.

Remove the cooling fan cover.

Remove the engine cover bolts and screws.

Separate the engine cover joint claws.

Remove the cylinder head.

Remove the dowel pins and cylinder head gasket.

Remove the cam chain guide.

CYLINDER HEAD DISASSEMBLY

Remove the valve spring cotters, retainers, springs, spring seats and valve stem seals using a valve spring compressor.

• Be sure to compress the valve springs with a valve spring compressor.
• Mark all disassembled parts to ensure correct reassembly.

Valve Spring Compressor
Valve Spring Compressor Attachment

Remove carbon deposits from the combustion chamber.

Clean off any gasket material from the cylinder head mating surface.

Be careful not to damage the cylinder head mating surface.

INSPECTION

CYLINDER HEAD

Check the spark plug hole and valve areas for cracks.

Check the cylinder head for warpage with a straight edge and feeler gauge.

Service Limit: 0.05mm repair or replace if over

VALVE SPRING FREE LENGTH

Measure the free length of the inner and outer valve springs.

Service Limits:

Inner : 30.1mm replace if below
Outer : 33.3mm replace if below

VALVE/ VALVE GUIDE

Inspect each valve for bending, burning, scratches or abnormal stem wear.

Check valve movement in the guide.

Measure each valve stem O.D.

Service Limits:

IN : 4.9mm replace if below
EX: 4.9mm replace if below

CYLINDER HEAD ASSEMBLY

• When assembling, a valve spring compressor must be used.
• Install the cotters with the pointed ends facing down from the upper side of the cylinder head.

Valve Spring Compressor
Valve Spring Compressor Attachment

Tap the valve stems gently with a plastic hammer for 2-3 times to firmly seat the cotters.

Be careful not to damage the valves.

See also: