VESPA GTS Super 125 i.e. Service Station Manual page 26

Characteristics
- Check the concentricity of the valve head by
placing a dial gauge at right angles to the valve
head and rotating it on the «V» shaped support.
Characteristic
Admissible limit:
0.03 mm
Measure the valve guide.
Characteristic
Valve guide:
5 +0.012 mm
- After measuring the valve guide diameter and the
valve stem diameter, check clearance between
guide and stem.
Specification
Standard clearance:
Admissible limit:
Specification
Standard clearance:
Admissible limit:
- Check that there are no signs of wear on the mating surface with the set screw articulated terminal.
CHAR - 26
Vespa GTS Super 125 i.e.
EXHAUST
INTAKE
Desc./Quantity
0.025 to 0.052 mm
0.09 mm
Desc./Quantity
0.013 - 0.04 mm
0.08 mm