APRILIA SHIVER 900 Service Station Manual page 240

Engine
•
Release the valve springs.
•
Remove the valve spring fittings and
the springs.
•
Remove the valves.
Checking the overhead camshaft
Check that the camshaft toothed wheel works
properly: if it is damaged or does not move
smoothly, replace both the timing chain and the
camshaft toothed wheel.
CAMSHAFT LOBES
•
Check that they do not show blue col-
ouring, pitting or scratches; otherwise,
replace the camshaft and the relevant
toothed wheel.
•
Use a micrometer to check the sizes
(a) and (b) of the camshaft lobes.
Camshaft lobes sizes:
Inlet
•
a: 36.28 / 36.32 mm (1.4283 / 1.4299
in); Limit: 36.15 mm (1.4232 in);
•
b: 28 mm (1.1023 in);
Outlet
ENG - 240
SHIVER 900