Rear Head Check; Valve Removal - APRILIA DORSODURO 1200 ABS - ATC Service Station Manual

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Engine
•
Remove the fixed chain slider.
NOTE
ON REASSEMBLY, PERFECTLY CLEAN THE MATING
SURFACE OF THE SPECIAL SCREW RETAINING THE
IDLE GEAR AND THE THREE TIMING GEARS AND RE-
PLACE THE ALUMINIUM WASHER.

Rear head check

•
Using a round scraper, clean off any carbon deposits in the combustion chamber.
CAUTION
DO NOT USE A POINTED INSTRUMENT TO AVOID DAMAGING OR SCRATCHING THE SPARK
PLUG THREADS OR THE VALVE SEATS.
•
Check that cylinder head is not damaged or scratched; replace it if necessary.
•
Check that there are no mineral deposits or rust in the cylinder head water cooled jacket;
remove them if necessary.
•
Check that the tappet covers and the camshaft toothed wheel cover are not damaged or
worn; replace the defective part(s).
Valves

Valve removal

•
Remove the head.
•
Place the head on supporting surface.
•
Number the valves and their bucket tappets in order to position them correctly upon refitting.
•
Remove the bucket tappets and the
adjustment shims using a magnet.
ENG - 254
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DORSODURO 1200 ABS - ATC