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Honda CRF450R User Manual

Honda CRF450R
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Suspension Adjustment Guidelines
Adjustments for Competition 117
Stiff
suspension
Symptom
Initial travel too stiff:
Stiff on small bumps while riding at full throttle in a straight line.
Stiff on small cornering bumps.
Front end wanders while riding at full throttle in a straight line.
Middle travel too stiff:
Stiff on bumps when cornering.
Front end wanders when cornering.
Stiff suspension on bumps, especially downhill bumps.
While braking, front end dives during initial travel, then feels stiff.
Final travel too stiff:
Doesnt bottom on landings, but feels stiff.
Stiff on large bumps, especially downhill bumps.
Stiff on large bumps when cornering.
Entire travel too stiff:
Stiff suspension on any type of terrain.
Action
Test softer compression damping adjustments in one-click increments.
Reduce the rebound damping adjustments in one-click increments.
Check for dirt in the dust seals. Check the fork oil for any contamination.
If the front end dives while cornering, reduce the rebound damping in one click
increments. If that doesnt solve the problem, install the optional stiff spring.
If the stiff spring makes the suspension too stiff over the full range of travel:
test softer compression damping adjustments in one-click increments until the
desire compression damping for initial travel is obtained.
If initial travel isnt stiff:
Test stiffer compression damping adjustments in one-click increments. (This
should produce smooth fork action from initial to middle travel.)
If initial and middle travel is stiff:
Test softer compression damping adjustments in one-click increments.
Reduce the rebound damping in one-click increments.
If initial and middle travel arent stiff:
Test stiffer compression damping adjustments in one-click increments. (This
should produce smooth fork action from initial to middle travel.)
If final travel is still stiff after the above adjustment, or
If initial and middle travel becomes stiff:
Install the optional stiff spring.
Test softer compression damping adjustments in one-click increments.
If the entire travel feels stiff after the above adjustment:
Test softer compression damping adjustments in one-click increments until the
desired initial travel compression damping is obtained.
Lower the oil level by 0.2 oz (5 cc).
Test softer compression damping adjustments in one-click increments.
Reduce the rebound damping in one-click increments.
Lower the oil level by 0.2 oz (5 cc).

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Honda CRF450R Specifications

General IconGeneral
Bore x Stroke96.0mm x 62.1mm
Compression Ratio13.5:1
Fuel SystemProgrammed Fuel Injection (PGM-FI), 46mm throttle body
IgnitionFull transistorized ignition
StarterElectric
Transmission5-speed
Front Suspension49mm inverted Showa coil-spring fork with rebound and compression damping adjustability; 12.2 inches travel
Front BrakeSingle 260mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire120/80-19
Final DriveChain
Rear SuspensionShowa single shock with Pro-Link; rebound and compression damping adjustability; 12.4 inches travel

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