VESPA GTS Super 300 ie 2008 Service Station Manual page 26

Characteristics
- Remove any carbon deposits from the valve
seats.
- Check the width of the mark on the valve seat
«V» with Prussian blue.
Characteristic
Standard value:
1 - 1.3 mm
Admissible limit:
1.6 mm
- If the width of the mark on the valve seat is larger than the prescribed limits, true the seats with a 45°
milling cutter and then grind.
- In case of excessive wear or damage, replace the head.
Specification
Valve check Standard length
Valve check Standard length
- Measure the diameter of the valve stems in the
three positions indicated in the diagram.
Specification
Intake:
Exhaust:
CHAR - 26
Vespa GTS Super 300 ie (2008)
S
TANDARD VALVE LENGTH
STANDARD DIAMETER
Desc./Quantity
Intake: 94.6 mm
Exhaust: 94.4 mm
Desc./Quantity
4.987 - 4.972 mm
4.975 - 4.960 mm