Suzuki GN125F Service Manual page 86

Invert the absorber and stroke it several times to remove the
oil.
Remove the damper rod bolt by using the special tools
and hexagon wrench.
11F14 010: Front absorber tools -
Remove the oil lock piece and damper rod with rebound
spring.
Separate the inner tube from the outer tube.
Remove the stopper ring.
Remove the oil seal by using the special tool.
09913-50121: Oil seal remover
The oil seal removed should be replaced with a new
one.
CHASSIS
5-8