Valve Check; Valve Stem Deviation - APRILIA DORSODURO 1200 ABS - ATC Service Station Manual

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Engine
•
Remove the valves.

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.

VALVE STEM DEVIATION

Lift up the valve approx. 10 mm (0.39 in) from its
seat.
Measure the valve stem deviation in two perpen-
dicular directions and position the dial gauge as
shown in the figure.
If the measured deviation exceeds the specified
limit, determine if the valve or the guide must be
replaced.
Characteristic
Valve stem distortion
0.25 mm (0.0098 in)
If the valve stem, when measured with a micro-
meter, is worn to its limit and the clearance ex-
ceeds the specified limit, replace the valve.
If the valve stem lies within the specific limit, re-
place the valve guide.
Recheck the clearance after replacing the valve or
the guide.
Characteristic
Intake valve stem diameter
5.987 - 5.973 mm (0.2357 - 0.2352 in)
Exhaust valve stem diameter
5.975 - 5.960 mm (0.2352 - 0.2346 in)
ENG - 256
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DORSODURO 1200 ABS - ATC