APRILIA SCARABEO 500 - 2008, Service Station Manual

Page: 184 / 324

VALVE STANDARD LENGTH
Specification Desc./Quantity
Inlet: 95.0 ± 0.3 mm
Outlet: 94.2 ± 0.3 mm
- 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).
Engine
SCARABEO 500
ENG - 184