Checking The Decompression System; Checking The Overhead Camshaft - APRILIA PEGASO 650 STRADA Service Station Manual

PEGASO 650 STRADA - TRAIL - FACTORY
•
Remove the valve.

Checking the decompression system

•
Check the decompression system with
both the camshaft toothed wheel and
the decompression pin fitted on the
camshaft.
•
Check that the decompression lever
pin (1) protrudes from the camshaft.
•
Check that decompression cam (2) is
free to move without obstacles.

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: 43.488 / 43.588 mm (1.7121 / 1.7161
in); Limit 43.388 mm (1.7062 in)
Engine
ENG - 129