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-Pull out the rocker arms shaft and inspect that the rocker arms should not be worn and the oil
hole is not obstructed.
-Pulling cylinder head gently off the cylinder.
-Remove the dowel pins, cylinder head gasket and the chain guide rod.
-Clean the coupling surfaces with carefully not to damage them.
-Clean the combustion chamber, ridding any carbon deposits.
-Check that the valve seats.
-Examine the combustion chamber and shown no sign of cracks or damage.
-Use a calibrated rule, inspect the cylinder head lower surface is perfect flatness.
-Use a thickness gauge, inspect that the
surface wear does not exceed 0.05mm.
-Measure the free length of the valve springs.
The limit of inner spring is 31.2mm.
The limit of outer spring is 34.1mm.
-Examine the valves should not be damaged,
cracked, burnt or bended.
Clean the valve, removing all carbon formation
and measure the diameter of vale axle.
The wear limit is 4.9mm.
Inspect the condition of the seat on the valve
head, damaged or cracked are not allowed.
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