APRILIA ETX 150 Service Station Manual page 98

Engine
Inspecting the springs and half-cones
Check that the spring supporting caps, the cotters
and the oil seal do not show signs of abnormal
wear. Replace a component when worn.
Measure the unloaded spring length.
Characteristic
Standard length of spring valve
44.8 / 39.2 mm (1.76 / 1.54 in)
Timing
Removing the chain tensioner
•
Remove the central screw (1) of the
chain tensioner, making sure to collect
the tensioning spring (2)
ENG - 98
ETX - STX 150