VESPA 946 E4 EMEA 2021 Manual page 40

Technical Data
- Measure the diameter of the valve stems in the
three positions indicated in the diagram.
Specification
Intake:
Exhaust:
- Check the deviation of the valve stem by resting
it on a «V» shaped abutment and measuring the
extent of the deformation with a dial gauge.
Characteristic
Limit value admitted:
0.02 mm
- Check the oscillation of the valve head by ar-
ranging a dial gauge at right angle relative to the
valve head and rotate it on a "V" shaped abutment.
Characteristic
Limit allowed:
0.3 mm
Measure the valve guide.
Characteristic
Valve guide:
4.3 ± 0.1 mm
DT - 40
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
STANDARD DIAMETER
Desc./Quantity
4.030 to 4.015 mm
4.975 - 4.960 mm