Ohlins FGYA581 Mounting Instruction
- Category
- Motorcycles
- Type
- Mounting Instruction
Mounting Instructions
Öhlins front fork kit FG YA 581 for Yamaha WR YZ 2005
© Öhlins Racing AB. All rights reserved. Any reprinting or unauthorized use without the
written permission of Öhlins Racing AB is prohibited. Printed in Sweden.
Öhlins front fork 48 EXF
CAUTION!
The front fork springs are delivered separately and
must be installed before the front fork is mounted
to the bike. See page 4.
Your Öhlins front fork 48 EXF 2005 is an upside
down type front fork featuring the following ad-
justers.
Compression damping adjuster
The compression adjuster is located at the bottom
of the fork leg.
Adjustments are made by turning the screw.
Rebound damping adjuster
Adjustments are made at the top of the fork leg
by turning the wheel.
Spring pre-load adjuster
Adjustments are made by changing pre-load tube
inside the fork.
NOTE!
When delivered the Öhlins front fork is dialed to
recommended settings for the specific brand and
make of the motorcycle. If you have changed the
settings, check like this:
The adjusters have a normal right hand tread. Turn
the damping adjusters clockwise to fully closed (pos.
zero [0]). Turn counter clockwise to open and count
the clicks until you reach the recommended number
of clicks. See Setup data on page 8.
CAUTION!
Do not use too much force, delicate sealing sur-
faces can be damaged.
Compression
adjustment
Spring
pre-load
adjuster
Rebound damping
adjuster
Checking sag and ride height
Rear suspension
R1.Bike on a stand with the
suspension fully extended = ............
R2.Bike on the ground without rider = ........... .
R3.Bike on the ground with rider = ............
Free sag
R1 - R2 = ............
Recommended: 30±5 mm
Ride height
R1 - R3 = ............
Recommended: 30% of the total stroke
NOTE!
If ride height is higher than recommended,
softer spring/springs must be used.
If ride height is lower than recommended,
harder spring/springs must be used.
Contact your Öhlins dealer for advice.
Öhlins Racing AB, Box 722, S-194 27 Upplands Väsby, Sweden.
Phone +46 8 590 025 00. Fax +46 8 590 025 80.
www.ohlins.com
Part No. FG YA 581. Issued 04 11 25
Setup data
Lenght 938 mm
Stroke 300 mm
Rebound adjuster 14 clicks
Compression adjuster 14 clicks
Spring pre-load 4 mm
Front fork oil level 100 mm
Front fork position 4 mm
Spring rate:
YZ/WR 250F: 4.1 N/mm
YZ/WR 450F: 4.3 N/mm
Fork position is
measured from
the top of the fork
leg, to the top
surface of the
triple clamp.
4 mm
Oil level
Oil level is
measured from
the top of the
outer leg, with the
top nut off, the
fork fully
compressed and
no spring
installed.
Bike on a stand.
F1
R1
Bike on the ground.
F2
R2
Bike with rider on.
F3
R3
Öhlins products are subject to continual improve-
ment and development. Consequently, although
these instructions include the most up-to-date
information available at the time of printing, there
may be minor differences between your suspen-
sion and this manual. Please consult your Öhlins
dealer if you have any questions with regard to
the contents of the manual.
NOTE!
During storage and transportation, espe-
cially at high ambient temperature, the oil
and grease used for assembling may run out
inside the packing and damage the
expanded polystyrene packing material. This
is not unusual and is in no way detrimental
to thefront fork.
Kit contents
Before installing the suspension components,
please check the contents of the kit, listed on
the front page of this instruction. If anything is
missing, contact your Öhlins dealer.
Description Pcs. Part No.
Front fork type 1 FG YA 581
Spring (4.1 N/mm) 2 02428-41
Spring (4.3 N/mm)*
Spring (4.5 N/mm) 2 02428-45
Spring support 2 02436-04
Sticker Öhlins 2 02332-09
Sticker Öhlins 2 00197-01
Owners Manual 1
* Use a 4.1 N/mm spring in one leg and
a 4.5 N/mm in the other.
Before installation
Öhlins Racing AB can not be held responsible for
any damage whatsoever to suspension components
or vehicle, or injury to persons, if the instructions for
fitting and maintenance are not followed exactly.
Similarly, the warranty will become null and void if
the instructions are not adhered to.
WARNING!
1. Installing suspension components, that is
not approved by the vehicle manufacturer,
may affect the stability of your vehicle. Öhlins
Racing AB cannot be held responsible for
any personal injury or damage whatsoever
that may occur after fitting the suspension
components. Contact an Öhlins dealer or
other qualified person for advice.
2. Please study and make certain that you
fully understand all the mounting instructions
and the owners manuals before handling this
suspension components kit. If you have any
questions regarding proper installation
procedures, contact an Öhlins dealer or other
qualified person.
3. The vehicle service manual must be
referred to when installing the Öhlins
suspension components
Safety signals
Important information concerning safety is
distinguished in this manual by the
following notations:
The Safety alert symbol means:
Caution! Your safety is involved.
WARNING!
Failure to follow warning instructions
could result in severe or fatal injury
to anyone working with, inspecting or
using the suspension, or to bystanders.
CAUTION!
Caution indicates that special
precautions must be taken to avoid
damage to the suspension.
NOTE!
This indicates information that is of
importance with regard to procedures.
Notes
WARNING!
1. It’s advisable to have an Öhlins dealer or other
qualified person to fit your front fork.
2. Instructions in the motorcycle workshop manual
are to be followed when removing the front fork.
3. When working on the motorcycle it must be
securely supported to prevent it from falling over.
Mounting Instructions
1
Put the bike on a stand so the front wheel has
ground clearance. Make sure it’s steadily positioned
and will not fall over.
2
Remove the front wheel, protecting covers and
the brake caliper. Let the caliper stay fitted to the
brake hose.
WARNING!
Replacing the steering stem is a demanding task
and must be carried out by an authorized dealer
or another qualified workshop.
WARNING!
Faulty handling when refitting the steering stem
can cause damage to the triple clamps and may
affect the riding characteristics of the motorcy-
cle.
CAUTION!
It is of vital importance that the triple clamps are
aligned.
3
Fit the Öhlins front fork legs to the triple clamps.
Tighten to a torque of 10-12 Nm for the lower
triple clamp and 20 Nm for the upper triple clamp.
NOTE!
Do not overtighten, as there is risk of deforming
the front leg tubes. This may disturb the front fork
movement.
2
3
2
Upper triple clamp
Lower triple clamp
Front leg cover
Brake
caliper
Caliper
protection
cover
Front fork leg
Front wheel
5
Install the the correct spring. Two pairs of springs
are provided – spring ratio 4.1 N/mm and 4.5 N/
mm, respectively.
NOTE!
A spring ratio of 4.3 N/mm is obtained if a 4.1 N/mm
spring is used in one leg and a 4.5 N/mm spring in
the other leg.
6
Fit the spring support, the desired pre-load tube
and the top nut.
7
Install the fork top cap. Tighten (30 Nm) the top
cap and the lock nut against each other, use tool
1860-01 and 17 mm wrench.
Adjust the compression and the rebound valves
according to specification card.
Spring
Top cap
Pre-load tube
Spring support
7
6
5
CAUTION!
Do not overtighten the clamps. There is a risk of
deforming the fork leg tubes. See the motorcycle’s
Workshop manual for correct torques.
9
Fit the legs on the motorcycle.
Tightening torques:
Upper tripple clamp: 20 Nm
Lower triple clamp: 10 Nm
8
Refit the top cap and tighten. Use top cap tool
1761-02 or 1860-01.
The top cap should not be tightened hard, only
turned in position by hand.
Tool
1761-02
8
17 mm wrench
17 mm wrench
NOTE!
The front fork legs must be aligned before
the front wheel axle is tightened.
5
4
Put the wheel back in position. Reassemble the
brake and fit the hose holder.
NOTE!
Do not tighten the front wheel axle before the
front legs are aligned. (5)
5
Let the motorcycle stand on the ground and com-
press the front suspension as hard as possible a
couple of times. This will align the fork legs.
NOTE!
Another way to align the front legs is to rotate
the front wheel as fast as possible and bring it to
a fast stop by braking.
6
Tighten the wheel axle and refit the removed pro-
tecting covers. Fit the Öhlins front leg covers.
NOTE!
Make sure that all bolts are tightened to the correct
torque and that nothing restrains the front fork when
the suspension is been fully compressed. See the
motorcycles workshop manual.
7
Continue your work with adjustments – see the
Öhlins Owners Manual.
Installing springs
1
Put the bike on a stand and loosen the screws in
the top fork crown that hold the fork legs.
NOTE!
On most MX-bikes you have take of the handle
bar off before you can unscrew the top cap.
Remove the adjustment wheel and the springs
and balls of the adjuster.
4
NOTE!
Closing the compression and the rebound valves
will keep the damper rod extended, making it
easier to install the new spring.
Pull out the damper rod as far as possible.
Close the compression and the rebound valve
(clockwise).
Slot
screwdriver
Guide sleeve
4
Adjustment
wheel
Balls and
springs
2
Unscrew the top cap, use tool (1860-01 or
1761-02). Put a box under the front wheel so
that the springs are visible.
Tool (1860-01)
Top cap
17 mm
wrench
Damper rod
extender
Tool (1761-02)
Tool 1860-01
3
Remove the top cap from the damper rod
extender. Use a 17mm wrench, and tool (1860-01
or 1761-02).
Damper
rod assy
17 mm wrench
-
1
-
2
-
3
-
4
Ohlins FGYA581 Mounting Instruction
- Category
- Motorcycles
- Type
- Mounting Instruction
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