Yamaha YFM7RD Owner's Manual page 42

(a)
4
1. Spring preload adjusting ring
2. Position indicator
TIP
A special wrench can be obtained at a Yamaha
dealer to make this adjustment.
(b)
4-14
1. Special wrench
Spring preload setting:
Minimum (soft):
1
Standard:
2
Maximum (hard):
5
1