Yamaha YZ450F(T) Owner's Service Manual page 628

SETTING
2. Use of stiff spring
Generally a stiff spring gives a stiff riding
feeling. Rebound
become weaker, resulting in lack of a
sense of contact with the road surface or in
a vibrating handlebar.
To set a stiff spring:
• Change the rebound damping.
Turn in one or two clicks.
• Change the compression damping.
Turn out one or two clicks.
È Coverage of spring by weight
É Rider weight
1 Soft
2 Standard
3 Stiff
7 - 15
T U N
damping tends to