APRILIA M192M Workshop Manual page 168

UPDATING ENGINES M192M / M191M
• Remove the camshaft drive pulley and its washer.
•
Remove the screw, spacer and tensioner shoe.
•
Remove the chain and the sprocket.
NOTE It is advisable to mark the chain to ensure that its
original turning direction is maintained. The tensioner shoe
must be removed from the transmission side. The lower
chain guide shoe can only be removed after the head is dis-
assembled.
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Engines M192M / M191M