Yamaha TZ125M1 Owner's Service Manual page 253

EC72L003
Chassis setting troubleshooting
<Symptom>
Chattering
(Small
rebounds,
up-and-down
movements)
Too stiff
feeling
Spongy feeling
<Cause>
Bottoming (full stroke)
Further in stroke
Too stiff (poor stroke)
Looseness in parts
Tire/Rim
Poor operation
Too stiff (poor stroke)
Bottoming (full stroke)
Poor of damping force
Too soft
7-19
TUN
SETTING
<Measures>
• Increase spring preload.
• Increase damping force for compression.
• Increase damping force for compression, or
decrease damping force for rebound.
• Decrease spring preload.
• Decrease damping force for compression.
• Down the oil level (for front fork only).
• Check bolts, bearings, etc. as well as their
installation.
• Recheck balance.
• Check deformation (runout).
• Check the shock absorber.
(Check rod, inner tube, etc. for bending. If
bent, replace.)
• Check for any deviation from center after
tightening front wheel axle.
(Replace if deviated in any way.)
• Too much tightened bolts for front
fork outer tube ≥ Retorque the bolts to
specification (handle crown, under bracket,
steering damper stay, handlebar).
• Decrease spring preload.
• Decrease damping force (for both compres-
sion and rebound).
• Increase spring preload.
• Increase oil level (for front fork only).
• Increase damping force for compression, or
decrease damping force for rebound.
• Increase damping force (for both compres-
sion and rebound).
• Increase spring preload.