Cylinder Head/Valve - SANYANG INDUSTRY CO. XS125-K Service Manual

5. CYLINDER HEAD/ VALVE
TROUBLE SHOOTING ...........................5-1
SERVICE INFORMATION......................5-2
CAM SHAFT REMOVAL .......................5-3
CYLINDER HEAD/ROCKER ARM REMOVAL
CYLINDER HEAD DISASSEMBLY......5-6
VALVE/VALVE GUIDE INSPECTION
TROUBLE SHOOTING
LOW COMPRESSION
1. Valve
Incorrect valve clearance
Burned or bent valves
Incorrect valve timing
Broken valve spring
2. Cylinder head
Leaking or damaged head gasket
Warped or cranked cylinder head
HIGH COMPRESSION
1. Excessive carbon buildup on piston or combustion chamber.
ABNORMAL NOISE
I. Incorrect valve clearance
2. Broken valve spring
3. Worn rocker arm or camshaft
4. Loose or worn cam chain
5. Worn cam chain tensioner
6. Worn cam sprocket teeth
VALVE GUIDE REPLACEMENT .........5-8
VALVE SEAT INSPECTION/REFACING
VALVE SEAT GRINDING ......................5-10
.......5-4 CYLINDER HEAD ASSEMBLY.............5-13
CYLINDER HEAD INSTALLATION.......5-14
...........5-7 CAM SHAFT INSTALLATION...............5-15
......5-9
5-1