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Adjustments for Competition 113
Front Suspension Adjustments
The CRF uses a pneumatic spring in the front fork.
The front fork spring rate can be adjusted by
changing the fork air pressure and oil capacity.
The forks on CRF’s are about right for riders
weighing between 170 lb (77 kg) and 200 lb (91
kg) (less riding gear). So if you're a heavier rider,
you have to go up on the oil capacity or air
pressure.
Do not adjust the oil capacity or PSF air pressure
to a level that is outside the minimum or maximum
level.
PSF Air Pressure
• Adjust the PSF air pressure when the fork is cold
as follows:
1. Place an optional workstand under the engine,
so that the front wheel is off the ground.
2. Remove the valve caps and clean the area
around the PSF air valve (1).
3. Adjust the PSF air pressure.
• Air fork pump, 0-60 psi 07AMJ-MENA300
Do not adjust the PSF air pressure to a level that is
outside the minimum or maximum level.
The correct “cold” PSF air pressures are:
standard: 35 psi (240 kPa, 2.4 kgf/cm
2
)
with standard oil capacity:
The higher or lower PSF air pressure affects the
entire range of fork travel.
4. Check that there is no air leakage. If there is
any air leakage, replace the air valve assembly.
5. Make sure the valve stem caps are secure. If
necessary, install new caps.
If you need to adjust the PSF air pressure when the
front forks are warm (after driving), refer to page
30.
Oil capacity
• To adjust the oil capacity refer to Fork Assembly
on page 122.
Oil capacities are:
standard: 8.2 US oz (242 cm
3
)
When adjusting oil capacity, bear in mind that the
air in the fork will increase in pressure while
riding; therefore, the higher the oil capacity, the
higher the eventual pressure of any air in the fork.
with standard PSF air pressure:
Fork Springs
(1) PSF air valve
(1)
soft (minimum) 31 psi (220 kPa, 2.2 kgf/cm
2
)
medium-soft 33 psi (230 kPa, 2.3 kgf/cm
2
)
standard 35 psi (240 kPa, 2.4 kgf/cm
2
)
medium-stiff 36 psi (250 kPa, 2.5 kgf/cm
2
)
stiff (maximum) 37 psi (260 kPa, 2.6 kgf/cm
2
)
Force (lbf/N)
PSF air pressure (MAX)
37 psi (260 kpa, 2.6 kgf/cm
2
)
PSF air pressure (STANDARD)
35 psi (240 kpa, 2.4 kgf/cm
2
)
PSF air pressure (MIN)
31 psi (220 kpa, 2.2 kgf/cm
2
)
Stroke (in/mm)
soft (minimum) 7.1 US oz (210 cm
3
)
standard 8.2 US oz (242 cm
3
)
stiff (maximum) 8.5 US oz (250cm
3
)
Force (lbf/N)
Oil capacity (MAX)
8.5 US oz (250 cm
3
)
Oil capacity (STANDARD)
8.2 US oz (242 cm
3
)
Oil capacity (MIN)
7.1 US oz (210 cm
3
)
Stroke (in/mm)
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