PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 272 / 892

3. Rectify the valve only as much as to obtain an
even surface contacting the valve seat.
MAKE SURE THAT VALVES ARE MACHINED WITH THE
CORRECT ANGLE
.
Characteristic
Valve rectification angle:
45.5°
4. Visually check if the valve stem end has traces
of abnormal wear.
If the valve stem shows abnormal wear, proceed
with the relevant rectification.
This reworking must however be comprised within
a 2 mm limit from the rated length value.
DO NOT OVERHEAT THE VALVE DURING RECTIFICA-
TION.
Characteristic
Inlet valve rated length:
112.8 mm
Exhaust valve rated length:
114.5 mm
5. Check the valve head thickness.
If the valve head thickness is shorter than the min-
imum value allowed, replace the valve.
Characteristic
Inlet valve minimum thickness allowed:
0.8 mm
Exhaust valve minimum thickness allowed:
1.0 mm
Engine
PORTER 1.3 16V
EN - 272