APRILIA SHIVER 900, Service Station Manual

Page: 241 / 444

•
a: 35.13 / 35.17 mm (1.3831 / 1.3846
in); Limit: 35.00 mm (1.3779 in);
•
b: 28 mm (1.1023 in);
•
Fasten the camshaft in horizontal po-
sition, as shown in the figure, and make
it spin to check the eccentricity with a
dial gauge; if necessary, replace the
component.
Camshaft eccentricity maximum limit 0.040
mm (0.0016 in)
Valve check
CAUTION
REPLACE THE VALVES ONE AT A TIME. DO NOT MIX THE COMPONENTS. EACH VALVE MUST
BE INSERTED INTO ITS SEAT, WHICH IS MARKED PRIOR TO REMOVAL.
CAUTION
THE SEAT (1) ON THE VALVE HEAD CANNOT BE REGROUND. IF REQUIRED, REPLACE THE
VALVE.
GRINDING WITH ABRASIVE PASTE IS ALLOWED; VALVE STEM END REGRINDING IS NOT AL-
LOWED.
Clean off any combustion residues from the
valves.
Check the seat (1) on the valve head with a ruler
flush.
The surface of the seat must not be concave; re-
place the valve if necessary.
Check the clearance between the stem and the
valve guide:
inlet: 0.013 - 0.040 mm (0.00051 - 0.00157 in);
limit: 0.080 mm (0.00315 in)
outlet: 0.025 - 0.052 mm (0.00098 - 0.00205 in);
limit: 0.100 mm (0.00394 in)
SHIVER 900
Engine
ENG - 241