APRILIA SCARABEO 500 2008 Service Station Manual page 184

Engine
Specification
Outlet:
- Check that there are no signs of wear on the fay-
ing surface with the set screw articulated terminal.
- If no anomalies are found during the above
checks, the same valves can be reused. For better
sealing results, it is advisable to grind the valve
seats. Grind the valves gently with fine-grained
lapping compound. Upon grinding, keep the cylin-
der head in 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 ROTATE 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 CHANGE THE VALVE FITTING POSITION (RH - LH).
ENG - 184
VALVE STANDARD LENGTH
Inlet:
SCARABEO 500
Desc./Quantity
95.0 ± 0.3 mm
94.2 ± 0.3 mm