HER CHEE GTC-50, Service Manual

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ADLY
MOTO
6-1
6. CYLINDER HEAD / CYLINDER / PISTON
Attention of Operation
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Can be operated when engine installed on vehicle.
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Must cleaning before operating , avoiding dust enter the engine.
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Remove the gasket dust stay on joint face.
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When remove the cylinder , avoid to use screw driver to damage the joint face.
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Avoid to damage the cylinder inner surface and piston face.
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Cleaning before check parts, and smear motor oil appointed in sliding face before
the installation.
Diagnosis of Troubles
Low compression pressure, poor start, idle speed not stable
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Air leakage of cylinder head gasket
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Wear & damage the piston ring
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Wrong installation of spark plug
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Wear & damage the cylinder and piston
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Inlet valve poor.
Compression pressure too high, overheating, locking
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Piling up carbon of cylinder head or piston head.
Piston Knocking Noise
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Wear the cylinder and piston
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Wear the piston pin hole and piston pin
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Wear the needle bearing of crank connecting rod (small end)
Piston ring noise
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Wear or damage the piston ring
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Wear or damage the cylinder