VESPA GTS Super 300 ie 2008 Service Station Manual page 28

Characteristics
Specification
Standard clearance:
Admissible limit:
Specification
Standard clearance:
Admissible limit:
- Check that there are no signs of wear on the mating surface with the set screw articulated terminal.
- If no faults are found during the above checks,
you can use the same valves. To obtain better
sealing performance, grind the valve seats. Grind
the valves gently with a fine-grained lapping com-
pound. During the grinding, keep the cylinder head
with the valve axes in a horizontal position. This
will prevent the lapping compound residues from
penetrating between the valve stem and the guide
(see figure).
CAUTION
TO AVOID SCORING THE FAYING SURFACE, DO NOT KEEP ROTATING THE VALVE WHEN NO
LAPPING COMPOUND IS LEFT. CAREFULLY WASH THE CYLINDER HEAD AND THE VALVES
WITH A SUITABLE PRODUCT FOR THE TYPE OF LAPPING COMPOUND BEING USED.
CAUTION
DO NOT REVERSE THE FITTING POSITIONS OF THE VALVES (RIGHT - LEFT).
- Check that the camshaft bearings exhibit no scores or abnormal wear.
- Using a micrometer, measure the camshaft bearings.
Specification
Camshaft check: Standard diameter
Camshaft check: Standard diameter
CHAR - 28
Vespa GTS Super 300 ie (2008)
INTAKE
EXHAUST
S
TANDARD DIAMETER
Bearing A Ø: 36.95 ÷ 36.975 mm
Bearing B diameter: 19.959 ÷ 19.98 mm
Desc./Quantity
0.013 - 0.04 mm
0.08 mm
Desc./Quantity
0.025 to 0.052 mm
0.09 mm
Desc./Quantity