Honda CRF450R Owner's Manual page 34

4. SERVICE AND MAINTENANCE
Cam Shaft Holder Assembly Removal
Record the intake valve clearance, exhaust valve clear-
ance and decompressor arm clearance.
Loosen a cam sprocket bolt.
Rotate the primary drive gear lock bolt (crankshaft)
clockwise one turn and loosen the other sprocket bolt.
(1) CAM SPROCKET BOLTS
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Remove the cam chain tensioner lifter cover bolt and
sealing washer.
(1) CAM CHAIN TENSIONER LIFTER COVER BOLT
(2) SEALING WASHER
Make a tensioner shaft stopper tool out of a thin piece
of steel (0.8 mm thick) using the diagram.
12.0 mm
Turn the tensioner shaft clockwise with the stopper tool
until it stops, in order to retract the tensioner fully.
Then insert the stopper tool fully to hold the stopper in
the fully retracted position.
1
(1) STOPPER TOOL
1