VESPA 946 E4 EMEA 2021 Manual page 39

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
Specification
bearing «A»
bearing «B»
bearing «C»
Measure the unloaded spring length
Characteristic
Standard length
35.8 mm
- Clean the valve seats of any carbon residues.
- Using the Prussian blue, check the width of the
impression on the valve seat "V".
Characteristic
Standard value:
1 - 1.3 mm
- If the impression width on the valve seat is larger than the prescribed limits, true the seats with a 45°
mill and then grind.
- In case of excessive wear or damage, replace the head.
HEAD BEARINGS
Ø 28.000 (+0.007 +0.028) mm
Ø 42.000 (+0.009 +0.034) mm
Technical Data
Desc./Quantity
Ø 10.000 (+0.015) mm
DT - 39