YG125-30A Maintenance Manual
Rear wheel and rear suspension device
125
For the damage form, fault symptom and repair method of rear wheels
Component
description
Damage form
Trouble symptom of
component
Trouble symptom of
motorcycle
Repair method
Rear wheel
Rear rim is twisted
and deformed
．
Rear rim is twisted and
deformed
．
Off racking in running
．
rear
wheel wobbles in running
Replace rear rim
The hub bearing hole
is over worn
The bearing block hole
has a loose match with
the bearing.
Off racking in running
．
rear
wheel wobbles in running
Replace rear rim
The bearing is over
worn and
damaged
The axial and radial
gaps of bearing inner
and outer rings are too
big or is insufficient
rotation.
Off racking in running
．
rear
wheel wobbles in running
Replace bearing
Rear tire
The inner tire is
pricked or broken
Rear tire has very low
pressure
Inflexible of direction
handle, insufficient engine
output
Repair or replace
inner tire
The tire is over worn
(the tire vein depth is
less than 2mm)
It is possible to slip and has
a poor slip proof function
Replace outer tire
Maintenance of Rear Transmission
Component
description
Damage form
Trouble symptom of
component
Trouble symptom of
motorcycle
Repair method
Sprocket
and cam
sprocket
Gear is over wor
Drive chain has abnormal
sound, drive chain is easy
to fall out.
Replace sprocket
and cam sprocket
Drive chain
Too dirty or poor
lubrication
Drive chain has abnormal
sound
Clean and lubricate
the chain.
Improper chain
tightness.
Chain is over tight
Drive chain has abnormal
sound
Adjust the chain
tightness to
15~25mm
Chain is over loose
Drive chain is easy to fall
out.
Adjust the chain
tightness to
15~25mm
Over worn
Drive chain has abnormal
sound, and is easy to fall.
Replace drive chain
Maintenance of Rear Suspension
Component
description
Damage form
Trouble symptom of
component
Trouble symptom of
motorcycle
Repair method
Rear shock
absorber
assembly
Rear shock
absorber spring is
broken or with
insufficient
elastic force
Rear shock absorber
spring is broken or
with insufficient
elastic force
Rear shock absorber is
over soft or over hard
Replace rear shock
absorber spring
Leakage at rear
damper
Leakage at rear
damper
Leakage at rear shock
absorber
，
rear
shock absorber is over soft
Replace rear
damper
Piston rod on rear
damper is bent,
deformed or broken
Piston rod on rear
damper is bent,
deformed or broken
Rear shock absorber is
over hard
Replace rear
damper
https://www.motomanuals.net/
