Yamaha YZF-R1 Service Manual page 44

Damping Adjustment Method
Turn clockwise to increase the damping force and anticlockwise to reduce the damping force.
The adjustment range is:
Rebound : 1 to 25 steps back from the adjustor's clockwise lightly tightened position.
Compression : 1 to 25 steps back from the adjustor's clockwise lightly tightened position.
Shipping position
Rebound : 10 steps back from the tightened adjustor position.
Compression : 10 steps back from the tightened adjustor position.
NOTICE
When tightening the adjustor, do it lightly. Over-tightening the adjustor can damage it.
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