VESPA GTS Super 300 ie 2008 Service Station Manual page 27

Vespa GTS Super 300 ie (2008)
Characteristics
MINIMUM ADMISSIBLE DIAMETER
Specification Desc./Quantity
Intake: 4.96 mm
Exhaust: 4.945 mm
- Calculate the clearance between valve and 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
- 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.
CHAR - 27