Measure the valves, replace any valves that are not within the specified dimensions.
The most important parameters of the valve disc:
a = max. 3.5mm;
b = min. 0.5 mm
α= 45°.
In the event that valve stem ends are worn, they can be machined with a grinder provided that no more than 50% of the material is removed.
Inlet valve poppets can be machined on a valve grinder provided that the size (b) not less than 0.5 mm. This is unacceptable for exhaust valves, as they are made of a special material. Exhaust valves can only be made usable again after grinding with paste, or they must be replaced. Under no circumstances should these valves be simply thrown away.
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