Gilera 633721 Workshop Manual page 148

Engine
Inspecting the valves
- Measure the diameter of the valve stems in the three positions indicated in the diagram.
Specification
Outlet:
Specification
Outlet:
- Calculate the clearance between valve and valve guide.
- Check the deviation of the valve stem by resting
it on a "V" shaped abutment and measuring the
extent of the deformation with a comparator.
Characteristic
Limit values admitted:
0.1 mm
- Check the concentricity of the valve head by ar-
ranging a comparator at right angle relative to the
valve head and rotate it on a "V" shaped abutment.
Characteristic
Admissible limit:
0.03 mm
ENG - 148
STANDARD DIAMETER
Inlet:
MINIMUM ADMISSIBLE DIAMETER
Inlet:
Nexus 500 euro 3
Desc./Quantity
4.987 - 4.972 mm
4.975 - 4.960 mm
Desc./Quantity
4.96 mm
4.945 mm