VESPA GTS Super 125 i.e. Service Station Manual page 25

Vespa GTS Super 125 i.e.
- In case of excessive wear or damage, replace the head.
Specification
Exhaust
- Measure the diameter of the valve stems in the three positions indicated in the diagram.
Specification
Intake:
Exhaust:
Specification
Intake:
Exhaust:
- Calculate the clearance between the valve and
the valve guide.
- Check the deviation of the valve stem by resting
it on a «V» shaped support and measuring the ex-
tent of the deformation using a dial gauge.
Characteristic
Limit values admitted:
0.1 mm
STANDARD VALVE LENGTH
Intake
STANDARD DIAMETER
MINIMUM ADMISSIBLE DIAMETER
Characteristics
Desc./Quantity
84.5 mm
94.5 mm
Desc./Quantity
4.987 - 4.972 mm
4.975 - 4.960 mm
Desc./Quantity
4.96 mm
4.945 mm
CHAR - 25