Honda CRF450R 2009 Service Manual page 553

TROUBLESHOOTING
POOR HANDLING
Steering is heavy
Steering stem adjusting nut too tight
• Damaged steering head bearings
• Faulty HPSD
Either wheel is wobbling
Excessive wheel bearing play
Bent rim
Improperly installed wheel hub
Excessively worn swingarm pivot bearings
Bent frame
The motorcycle pulls t o one side
Fron t and rear wheels not aligned
Bent fork
Bent swingarm
Benl axle shaft
Benl frame
NOTE '
For the recommendations below to
be
most useful , the motorcycle must
be
adjusted as follows:
- Forie compression damping at standard position. at standard fork oil quantity and viscosity, and air
pressure zero ('09
+
' 12)1PSF standard cold air pressure (After ' 12).
- Shock: nitrogen pressure 1 MPa (10.2 kg/cm2, 145 psi). compression and rebound damping standard
position. and spring preload adjusted so the bikes sags with rider seated · see Owner's manual for spring
preload adjustment
Make only one change at a time in the sequence of remedies given below
Front End Oversteers ; It Cuts Too Sharply (such as In sand)
• Increase the fork oil capacity
• Use stiffer for1c; spring (,09· '12)
Front End Understeers; It Wa s hes Out Or Pus hes (such as on at tight track with hard ground)
• l ower fork oil capacity
• Use softer fork spring ('09 • ' 12)
Front End Hunts At High Speed ; It Wanders Under Power
• Increase the for1c; oil capacity
• Increase the shock oil preload
Front End Shakes Under Heavy Braking
Decrease shock absorber preload
• Increase shock absorber rebound damping
• Increase the for1c; oil capacity
Front End Hops Over Bumps In Smooth Turns
Decrease the fork oil capacity
• Decrease fork compression damping
• Use softer fork spring ('09 - ' 12)
Rear End Hops Over Bumps While A ccelerating
• Decrease shock absorber preload
• Decrease shock absorber compression damping
Rear End Gets Poor Traction While Accelerating Away From A Corner
Decrease shock absorber preload
• Decrease shock absorber compression damping
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