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Honda CRF450RX 2020 User Manual

Honda CRF450RX 2020
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Suspension Adjustment Guidelines
152 Adjustments for Competition
Suspension Adjustment Guidelines
Follow the procedures described below to accurately adjust your CRF, using the methods described on pages 143 – 151. Remember to make all adjustments in
one-click or 1/12 turn increments. Test ride after each adjustment.
Front Suspension Adjustment
Adjustments for Type of Track
Hard-surfaced track Begin with the standard setting. If the suspension is too stiff/soft, adjust according to the chart below.
Sand track Adjust to a stiffer position.
Example: Turn the compression damping adjuster to a stiffer position.
Install the optional stiff spring. (Adjust compression damping to a softer position and rebound damping to a stiffer position at this
time.)
Mud track Adjust to a stiffer position because mud build-up increases your CRF’s weight.
Example: Turn the compression damping adjuster to a stiffer setting.
Install the optional stiff spring
.
Adjustments for Too Soft/Stiff Damping
Symptom Action
Soft
suspension
Initial travel too soft:
Steering is too quick.
Front end darts while cornering or riding in a straight line.
Test stiffer compression damping adjustments in one-click increments.
Test stiffer rebound damping in one-click increments.
Middle travel too soft:
Front end dives when cornering.
If suspension isn’t stiff in initial travel:
Test stiffer compression damping adjustments in one-click increments.
If initial travel becomes stiff because of the above adjustment:
Reduce the rebound damping in one-click increments.
Test softer compression damping adjustments in one-click increments.
If that doesn’t solve the problem, install the optional stiff spring.
Final travel too soft:
Bottoms on landings.
Bottoms on large bumps, especially downhill bumps.
If initial and middle travel aren’t stiff:
Test stiffer compression damping adjustments in one-click increments.
If initial and middle travel are stiff:
Install the optional stiff spring.
If initial travel is stiff after installing the optional stiff spring:
Test softer compression damping adjustments in one-click increments.
If initial travel is still soft after installing the optional stiff spring:
Test stiffer compression damping adjustments in one-click increments.
If final travel is still soft after installing the optional stiff spring:
Increase the fork oil capacity in increments of 0.2 US oz (5 cm
3
).
Entire travel too soft:
Front end shakes.
Fork bottoms over any type of terrain.
Install the optional stiff spring.
Test stiffer compression damping adjustments in one-click increments.
Increase rebound damping in one-click increments.

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Honda CRF450RX 2020 Specifications

General IconGeneral
Engine Type449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke96.0mm x 62.1mm
Compression Ratio13.5:1
InductionProgrammed Fuel Injection (PGM-FI), 46mm throttle body
IgnitionFull transistorized ignition
Transmission5-speed
Final DriveChain
Front BrakeSingle 260mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire120/80-18
Wheelbase58.3 inches
Seat Height37.8 inches
Ground Clearance12.9 inches
StarterElectric
Trail4.6 inches
Front Suspension49mm inverted fork with rebound and compression damping adjustability; 12.0 inches travel
Rear Suspension12.4 inches of travel
Valve TrainUnicam, four-valve

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