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the valve guide.
4.
Overhauling the valve
- clean the carbon deposit
- check if the valves bent, burn or worn out.
- measure stem diameter of valves.
Limits:
Air inlet valve 5.43 mm
Exhaust valve 5.41 mm
Check the contact surface of valve, if the surface is
rough, rust or uneven, replace it. Measure the valve
line width.
Length along the axis, limits:
Air inlet valve: 1.8 mm
Exhaust valve: 1.5 mm
5.
Overhauling the valve spring
- check the valve appearance for deformation or
abnormal wear.
- measure the free length of inner and outer springs.
Limits: 22.5 mm
6.
Overhauling the spark plug
- Check the spark plug electrode and the center
electrode, if there is carbon deposit, clean it up.
- Check the corrosion of the spark plug electrode and
the central electrode. If there is too much corrosion,
replace the spark plug.