Defective Brakes; Poor Braking; Oil Leaks Or Malfunctioning Of Front Fork; Unstable Steering - Yamaha SZR 660 Service Manual

DEFECTIVE BRAKES/
OIL
LEAKS
OR MALFUNCTIONING OF FRONT FORK
TRBL
SHTG
9
DEFECTIVE
BRAKES
POOR BRAKING
Front
and
rear disk
brake
UNSTABLE STEERING
PROBABLE CAUSES
•
Brake pads worn
•
Brake
disk
worn
•
Water
in
the
brake
fluid
• Brake
fluid leak
• Brake
fluid
tank defective
•
Bleed cap
not
sealed
to calipers
• Fastening
bolt
loose
• Brake hose cracked
• Brake
disk dirty or
greasy
• Brake pads
dirty or
greasy
•
Incorrect
brake
fluid
level
OIL
LEAKS OR MALFUNCTIONING OF FRONT FORK
OIL
LEAKS
MALFUNCTIONING
PROBABLE CAUSES
• Inner tube deformed,
damaged
or rusty
• Outer
tube
damaged
or cracked
•
Oil
seal
lip
damaged
• Oil seal
assembled
incorrectly
•
Oil level incorrect (excessive)
• Shock-absorber rod stop
bolt
loose
•
O-ring on cap broken
• Drain
bolt
loose
• Drain
bolt
gasket
damaged
PROBABLE CAUSES
•
Inner tube
deformed,
damaged
or rusty
•
Outer tube deformed
or
damaged
• Fork
spring
damaged
• Piston
worn
or
damaged
•
Shock-absorber
rod
deformed
or
damaged
• Incorrect
oil
viscosity
• Incorrect
oil level
• Cartridge defective (overhaul)
Handle
bar
Steering
Front fork
Tyres
Wheels
Frame
UNSTABLE
STEERING
TRBL
SHTG
9
PROBABLE CAUSES
• Assembled
crooked or incorrectly
Handle bar crown assembled
incorrectly
Lower bracket crooked
Lower
steering
column
installed incorrectly
{ring
nuts not tightened
correctly)
Bearing or bearing tracks
damaged
Oil level not the
same
in
both tubes
Spring broken
Front
fork
crooked
Tyre pressure incorrect for type of load
Tyre pressure incorrect
Tyres
worn non-uniformly
Wheels
balanced
incorrectly
Wheel
deformed
• Bearing loose
* Wheel
axle
deformed
or loose
• Wheels excessively
off-centre
Deformed
Head
tube
damaged
Ball track
installed incorrectly
Rear swing arm
-j
—
•
Bushes
or bearings
consumed
'
—
• Deformed
or
damaged
Rear shock absorber
Spring yielded
Spring preload
incorrect
Oil leak
Transmission chain
Chain set incorrectly
Cowling
t
—
* Damaged
or broken
'
—
Assembled
incorrectly
9-7
9-8