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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 from the both forks and
clean the area around the PSF air valves (1).
3. Adjust the PSF air pressure.
• Air fork pump, 0-60 psi 07AMJ-MENA300
Adjust both left and right forks to the same PSF air
pressure.
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 level:
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 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 level
• To adjust the oil level refer to Front Suspension
Assembly on page 118.
Oil levels are:
When adjusting oil levels, bear in mind that the air
in the fork will increase in pressure while riding;
therefore, the higher the oil level, the higher the
eventual pressure of any air in the fork.
with standard PSF air pressure:
Fork Springs
(1) PSF air valve
(1) (1)
Left side:
Right side:
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) 4.3 in (108 mm)
standard 3.4 in (87 mm)
stiff (maximum) 3.3 in (83 mm)
Force (lbf/N)
Oil level (MAX)
3.3 in (83 mm)
Oil level (STANDARD)
3.4 in (87 mm)
Oil level (MIN)
4.3 in (108 mm)
Stroke (in/mm)
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