Inlet: 4.96 mm
Valve check Standard diameter:
Inlet: 4.972 ÷ 4.987 mm
Valve check Standard diameter:
Exhaust: 4.96 ÷ 4.975 mm
- Measure the diameter of the valve stems in the
three positions indicated in the diagram.
- Calculate the clearance between valve and valve
guide.
- Check that there are no signs of wear on the fay-
ing surface with the articulated set screw terminal.
- If no anomalies are found during the above
checks, you can use the same valves. For best
sealing results, it is advisable to grind the valves.
Grind the valves gently with a fine-grained lapping
compound. Upon grinding, keep the cylinder head
with the valve axes in a horizontal position. This
Engine X9 Evolution 125
ENG - 128
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