Yamaha YZ125/LC Manuel D'atelier Du Proprietaire page 550

SETTING
EC72B000
Rear suspension setting
The rear suspension setting should be made
depending on the rider's feeling of an actual run
and the circuit conditions.
The rear suspension setting includes the follow-
ing two factors:
1. Setting of spring preload
9 Change the set length of the spring.
9 Change the spring.
2. Setting of damping force
9 Change the rebound damping.
9 Change the compression damping.
EC72C001
Choosing set length
1. Place a stand or block under the engine to
put the rear wheel above the floor, and mea-
sure the length a between the rear wheel
axle center and the rear fender holding bolt.
2. Remove the stand or block from the engine
and with a rider astride the seat, measure
the sunken length b between the rear wheel
axle center and the rear fender holding bolt.
3. Loosen the locknut 1 and make adjustment
by turning the spring adjuster 2 to achieve
the standard figure from the subtraction of
the length b from the length a.
Standard figure:
90~100 mm (3.5~3.9 in)
7-20
TUN