KYMCO AK 550 Service Manual page 106

4.Engine
TROUBLESHOOTING
Oil level too low
1. Natural oil consumption
2. Oil leaks
3. Worn or poorly installed piston rings
4. Worn valve guide or seal
Poor lubrication pressure
1. Oil level too low
2. Clogged filter or oil passages
3. No use the specified oil
Cylinder Head Camshaft and Valves
• The cylinder head can be serviced with the engine installed in the frame.
Coolant in the radiator and water hoses must be drained.
• When assembling, apply molybdenum disulfide grease or engine oil to the valve
guide movable parts and valve arm sliding surfaces for initial lubrication.
• The valve rocker arms are lubricated by engine oil through the engine oil
passages. Clean and unclog the oil passages before assembling the cylinder
head.
• After disassembly, clean the removed parts and dry them with compressed air
before inspection.
• After removal, mark and arrange the removed parts in order. When assembling,
install them in the reverse order of removal.
4-2
AK 550