Yamaha YZ250(V) Owner's Service Manual page 578

SETTING
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)
NOTE:
9 If the machine is new and after it is broken in,
the same set length of the spring may change
because of the initial fatigue, etc. of the spring.
Therefore, be sure to make re-evaluation.
9 If the standard figure cannot be achieved by
adjusting the spring adjuster and changing the
spring set length, replace the spring with an
optional one and make re-adjustment.
7-18
TUN