Page 1
Owners Manual
Öhlins Superbike Front Fork FG 670
Page 2
Safety signals
Important information concerning safety is
distinguished in this manual by the
following notations:
!
This 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.
Introduction
All of Öhlins advanced suspension products
are adapted to the brand and model. This
means that length, travel spring action and
damping charac teristics, are tested individually just for the motorcycle that you have
decided to fit with Öhlins suspension.
Before installation
Öhlins Racing AB can not be held re spon si ble for any damage whatsoever to sus pen sion or vehicle, or injury to persons, if
the instruc tions for fitting and main tenance
are not fol lowed exactly. Similarly, the
warranty will be come null and void if the
instructions are not ad hered to.
! WARNING!
1. Installing a suspension, that is not ap proved by the vehicle man u fac tur er, may
affect the stability of your ve hi cle. Öhlins
Rac ing AB cannot be held responsible for
any per son al in ju ry or dam age what so ev er
that may oc cur after fi t ting the sus pen sion.
Contact an Öhlins deal er for advice.
2. Please study and make certain that you
ful ly un der stand all the mount ing in struc tions
and the owner´s man u als before han dling
this suspension kit. If you have any questions
regarding proper in stal la tion pro ce dures,
contact an Öhlins deal er or.
3. The vehicle service manual must be
re ferred to when installing the Öhlins suspension.
NOTE!
Öhlins products are subject to con tin u al
improve ment and de vel op ment. Con se quent ly, although these in struc tions in clude
the most up-to-date in for ma tion available
at the time of print ing, there may be minor
dif fer enc es between your sus pen sion and
this manual. Please con sult your Öhlins
dealer if you have any ques tions with regard to the con tents of the manual.
NOTE!
During storage and transportation, es pe -
ly at high ambient tem per a ture, the oil
cial
and grease used for as sem bling may run
out inside the pack ing and dam age the expanded pol y sty rene pack ing ma te ri al. This
is not unusual and is in no way det ri men tal
to the suspension.
© Öhlins Racing AB.
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Öhlins Racing AB is prohibited.
Printed in Sweden.
2
Page 3
Öhlins Front Fork FG 670
This Super Bike front fork is an improved
version of FG 570 with pressurised damping system. FG 670 is based on 6 years
experience from factory road racing. The
pressurised damping system improves the
front fork function at high frequency movements. The immediate damping responses
improve the tyre feeling and also give more
possibilities for adjustments. Of course
the combination of spring and air-gap (oil
level*) still gives a possibility to adjust the
characteristic of the fork to suit different
tracks and riders.
For example a soft spring in combination
with a small air-gap (high oil level) gives a
more progressive action of the front forks.
NOTE!
Gas pressure should not be changed or
used as an alternative to adjust the damping.
For better understanding, please refer to
our oil level chart see page 17.
A telescopic front fork is depending on a
smooth friction-free action. Make sure your
front forks are serviced regularly and don’t
use strong solvents such as brake cleaner
to clean the front forks. This will dry out the
seals and cause friction.
Contents
Before installation
Öhlins front fork FG 670
Adjusters
Setting up your forks
Changing springs
Changing seals
Dismantling the forks
Assembly of the forks
Oil level adjustment
Troubleshooting
Guidelines
Individual adjustments
Technical information
Spare parts list
Service tools
...........................................................2
...........................................................................4
.....................................................................19
.................................................3
......................................................5
...........................................................6
...............................................................7
.....................................................8
..................................................12
......................................................17
............................................................18
.................................................20
...................................................22
.............................................................23
...............................................................26
*
Front fork 670 is equipped with an external reservoir, pressurized
with nitrogen. A dividing piston separates the oil from the gas.
3
Page 4
Adjusters
Your Öhlins super bike front fork is provided with the following external adjusters:
• Spring pre-load adjuster
• Rebound damping adjuster.
• Two type of compression
damping adjuster:
- Reservoir valve adjuster in the
lower part of the fork leg.
- Main valve bleed circuit.
NOTE!
The rebound damping adjuster is located at
the top of the right hand fork leg. The Main
valve bleed circuit (compression adjuster) is
located at the top of the left hand fork leg.
Spring pre-load adjustment
Use a 14-mm wrench to turn the upper
adjustment screw. The adjustment range
is 0-18mm. On the adjustment screw one
turn will change 1mm in spring pre-load.
Recommended static sag is 25-30 mm.
Compression adjustment main valve.
Adjust the compression damping on the
adjustment screw positioned at the top of
the left hand fork leg. Use a hex key with
spherical head (use tool 794-01).
Adjustment range from closed valve
(clockwise) to maximum open valve
(counter clockwise) is 20 “clicks”. Recommended adjustment “click”, from closed
position: See specification card.
Compression adjustment reservoir valve
(Base valve)
Adjust the compression damping (shaft
displacement) on the lower part of the fork
legs. Use a normal screwdriver. Adjustment
range from closed valve (clockwise) to
maximum open valve (counter clockwise)
is 20 “clicks”. Recommended adjustment
“clicks”, from closed position:
See specification card.
Spring pre-load adjustment
14 mm wrench
Increase spring pre-load
Top cap
Reduce spring pre-load
Compression adjustment
Left Hand Fork Leg
Clockwise turn
closes = increase
compression
damping
Counter clockwise
turn opens = reduce
compression damping
Tool 794-01
Rebound adjustment
Right Hand Fork Leg
Clockwise turn
closes = increase
rebound damping
Counter clockwise
turn opens = reduce
rebound damping
Tool 794-01
Rebound adjustment
Adjust the rebound damping on the adjustment screw positioned at the top centre of
the right hand fork leg. Use a hex key with
a spherical head (use tool 794-01).
Adjustment range from closed valve (clockwise) until maximum open valve (counter
clockwise) is 20 “clicks”. Recommended
adjustment “click”, from closed position:
See specification card.
4
Compression adjusment reservoir valve (Base valve))
Counter clockwise turn opens =
reduce compression damping
Tool 794-01
Clockwise turn closes =
increase compression damping
Page 5
Setting up your forks
F1
R1
A-D. Bike on a stand
R2
E. Bike on the ground F. Bike with rider on
Here are some basic guidelines, how to set
up your Öhlins front forks. However, you
must remember that the front forks are just
one part of your motorcycle and to get it to
work properly, the whole motorcycle has to
be set up according to your bikes manual.
1
Put your bike on a front stand and fit the
Öhlins front fork.
NOTE!
The lower triple clamp must not be tightened to more than 12-15 Nm. This is also
important for the steering damper bracket,
when located around the upper front leg.
To high torque might deform the front fork
leg.
2
Set your initial pre-load of the spring, by
using a 14mm socket or wrench, until you
get a static sag of 25-30 mm. Each turn
gives 1mm in pre-load, maximum pre-load
is 18mm.
Spring pre-load adjustment
14 mm wrench
Increase spring pre-load
Reduce spring pre-load
F2
R3
F3
Setting the spring pre-load generally on
the bike
3
Pre-load on the spring/springs is very
important, since it affects the height of
the motorcycle and the fork angle. Consequently, handling characteristics can be
changed, even negatively.
Proceed as follows (it will be much easier if
done by two persons):
1 Place the motorcycle on a stand.
2 Lift up the rear end to a fully extended upper
position.
3 Measure the distance, e.g. from the ower edge of
the rear mud guard or from a point marked by a
piece of tape, immediately above the rear whee
axle, to the wheel axle. (R1)
4 Make a similar measurement on the front axle, e.g.
from the bottom of the upper fork crown to the
front wheel axle. The fork must be fully
extended. (F1)
5 Allow the motorcycle (without rider) to apply load
on the springs and repeat the measuring proce dure. (R2, F2)
6 Then take the same measurements with the rider
and equipment on the motorcycle. It is important
that the rider has a correct riding posture, so that
the weight is balanced on the front and rear wheel
in the same way as when riding. (R3, F3)
4
The measurements may not differ from the
following sizes:
Without rider:
Rear: 10-20 mm (R1-R2)
Front: 20-30 mm (F1-F2)
With rider:
Rear: 25-40 mm (R1-R3)
Front: 35-50 mm (F1-F3)
5
Page 6
Changing springs
1.
Unload the spring pre-load completely
by turning the adjustment nut counter
clockwise as far as possible. Use a 14 mm
wrench or socket.
12
2.
Loosen the screws that hold the fork legs
in the upper triple clamps.
3.
Remove the Top nut assembly. Use tool
797-01.
4.
Remove the top nut assembly from the
piston shaft. Use a 14 mm wrench to the
top and a 19 mm wrench to hold the nut on
the lower side of the top nut.
5.
Remove the adjustment driver and the
spring. Use a wire with a hook and carefully pull out the preload tube.
6.
Check the oil level according to page 17.
NOTE!
Use Öhlins Front fork oil 1311-01 only.
7.
Refit the Pre-load tube. Install the new
spring and refit the adjustment driver.
8.
Refit the top nut assembly to the piston
shaft. Tighten the jam nut to 20 Nm.
9.
Refit the top nut into the fork leg, with
the front wheel off the ground (use tool
797-01). Tighten the upper triple clamps
and adjust the preload, compression and
rebound according to above instructions.
CAUTION!
The top nut should only be tightened by
hand into the fork leg.
6
14 mm wrench
34
Tool 797-01
14 mm wrench
19 mm wrench
5 6
Adjustment driver
Spring
Preload tube
Tool 1765-03
1305-01
Check the oil level
CAUTION!
8 9
20 Nm
Tool 797-01
Page 7
Changing seals
!
1.
Remove the fork legs from the motorcycle.
Put the fork legs in upright position for
about 5 minutes to allow the oil to settle.
2.
Fasten the fork leg in a vice. Use soft jaws.
3.
Carry out instructions 1 to 5 in “Changing
springs”, page 6.
4.
Drain the cylinder tube from oil.
5.
Remove the outer tube, clean the seal and
check the condition. If the seal is in good
condition apply some red grease (146-01)
to it. A damaged seal must be replaced!
6.
First remove the circlip, then the seal and
finally the washer.
7.
Apply a thin layer of Öhlins red grease
(146-01) to the washer and to the sealing
surfaces of the fork seal. Install the seal
and the washer in the outer tube. Fit the
circlip into the groove.
NOTE!
It is important to use the correct grease in
order to achieve optimum fork function.
8.
Apply some front fork oil (1311-01) to the
inner tube surface and carefully mount the
outer tube (slide it completely down).
2 4
5 6
1st, Circlip
2nd, Seal
3rd, Washer
NOTE!
7
Circlip
Seal
Washer
0
180
8
Tire Lewer
WARNING!
! WARNING!
Be careful not to damage the fork seal!
9.
Repeat instructions 6 to 9 in “Changing
springs” on page 6. Refit the front fork.
7
Page 8
Dismantling the Forks
!
1.
Remove the fork legs from the motorcycle.
Put the fork legs in upright position for
about 5 minutes to allow the oil to settle.
2.
Fasten the fork leg in a vice. Use soft jaws.
3.
Unload the spring pre-load completely
by turning the adjustment nut counter
clockwise as far as possible. Use a 14 mm
wrench or socket.
NOTE!
Do not use the pre-load adjuster to tighten
or loosen the top-nut assy.
4.
Loosen the top nut assembly. Use tool
797-04.
5.
Remove the top nut assembly from the
piston shaft. Use a 14 mm wrench to the
top and a 19 mm wrench to hold the nut on
the lower side of the top nut.
6.
Remove the adjustment driver and the
spring. Use a wire with a hook and carefully pull out the preload tube.
7.
Remove the screw and o-ring from the
reservoir end cap.
NOTE!
Before the gas pressure is relieved the
adjuster settings must be counted and
noted. Even check that the gas pressure is
correct. Follow that, the adjusters should
be set in a fully open position.
8.
Relieve the nitrogen gas by inserting an
injection needle into the reservoir end cap
through the rubber valve.
8
23
14 mm wrench
4 5
Tool 797-04
14 mm wrench
19 mm wrench
6 7
Adjustment driver
Spring
NOTE!
WARNING!
8
Preload tube
Page 9
!
WARNING!
Releasing high pressure gas from the front
fork can be hazardous. Do not perform any
kind of service until gas pressure is completely released.
9.
Remove the circlip.
10.
Use tool 720-03 to lift up the reservoir end
cap. Install the tool 720-02 into the gas
piston.
11.
Use tool 1797-04 and 1765-03 to unscrew
the seal head from the cartridge tube.
Remove the piston rod unit.
12.
Fasten the piston rod in a vice. Use soft
jaws (727-02). Remove the nut with a 13
mm wrench or socket. Remove the valve
from the piston rod.
Place all parts, including the shims, in their
correct position on the work bench. Clean
all parts thoroughly and dry with compressed air.
NOTE!
The right hand fork leg is the rebound leg.
The left hand fork leg is the compression
leg.
Notes
910
Tool 1765-03
Tool 720-03
11
Tool 1797-04 Piston rod unit
Seal head
NOTE!
12
13 mm socket
Nut
Rebound Valve RH-Leg
Soft jaws
(727-02)
Compression Valve LH-Leg
Tool 720-02
9
Page 10
13.
Remove the Piston holder. Use a 22 mm
wrench.
14.
Remove the Topout spring, the Sleeve, the
Spacer and the O-ring.
15.
Remove the Seal head. Check the O-ring
and the X-ring. Change them if necessary.
16.
Remove the needle and change the O-ring
if necessary.
17.
Drain the cylinder tube from oil.
18.
Remove the gas piston in the reservoir, use
tool 720-02.
19.
Drain the reservoir from oil.
20.
Use a 17 mm wrench to unscrew the
complete compression valve at the bottom
of the fork.
13
22 mm Wrench
14
Piston holder
Topout spring
Sleeve
Spacer
O-ring
15 16
X-ring
Seal head
O-ring
17
18
O-ring
Rebound neendle
21.
Remove the piston from the compression valve. Place the shims in their correct
position on the work bench. Clean all parts
thoroughly, change O-rings if necessary
and dry all parts with compressed air.
Notes
10
19
21
20
Page 11
22.
Remove the outer tube, clean the seal and
check the condition. If the seal is in good
condition apply some red grease (146-01)
to it. A damaged seal must be replaced!
23.
First remove the circlip, then the seal and
finally the washer.
24.
Heat the tube where the bushings are positioned. Use a heat air gun.
22 23
180
1st, Circlip
2nd, Seal
3rd, Washer
0
25.
Put the outer tube standing up on a soft
suface, seal side facing down. Remove the
bushings by pushing them out. Use attachment bar (1757-01) and dismantling sleeve
(1759-07) from the top nut side.
26.
Tap gently on the attachment bar with a
heavy hammer, until the bushings are free
and can be released from the seal side of
the outer tube.
27.
Check the innertube for damages, replace
if necessary. Use a heat gun to warm up
the fork bottom and tool 786-05 to unscrew the inner tube of the fork leg.
28.
Check the reservoir tube for damages,
replace if necessary. Use tool 786-07 to
unscrew the reservoir tube.
24 25
Heat air gun
26 27
Upper bushing
Lower bushing
28
Tool 786-07
Attachment bar
(1757-01)
Dismantling sleeve
(1759-07)
Rubber mat
Tool 786-05
11
Page 12
Assembly of the forks
1.
Use Tool 786-07 to refit the reservoir tube.
Tighten to 45 Nm.
2.
Use Tool 786-05 to refit the inner tube of
the fork leg. Tighten to 80 Nm.
3.
Put the outer tube standing up on a soft
surface, seal side up. Fit the bushings
from the seal side of the outer leg. Install
first the upper bushing then the lower one.
Use installing sleeve (1759-08), guide ring
(1758-04) and attachment bar (1757-01)
when installing the upper bushing. Apply Loctite 601 on the seat position of the
upper bushing, use a long brush. Tap the
attachment bar until it reaches the correct
position (stop against a shoulder).
4.
When the upper bushing is in position, the
lower bushing is to be installed the same
way. Apply some red grease (146-01) to
the bushing before installation.
12
Tool 786-07
Apply Red grease (146-01), No loctite!
3
Long brush
Loctite 601
Outer tube
Lower bushing
Upper bushing
Tool 786-05
Guide ring
(1758-04)
Attachment bar
(1757-02)
Installing sleeve
(1759-08)
5.
Apply a thin layer of Öhlins red grease
(146-01) to the washer and to the sealing
surfaces of the fork seal. Install the seal
and the washer in the outer tube. Fit the
circlip into the groove.
NOTE!
It is important to use the correct grease in
order to achieve optimum fork function.
6.
Install the piston and the shims on the
base valves. Tighten the 8 mm nut with
a torque of 7 Nm. Check the piston ring
and the O-rings for damages. Replace if
necessary.
Install the base valve assembly into the
valve housing. Tighten to 20 Nm.
12
4
6
8 mm Nut,
7Nm
valve assembly,
20 Nm
Rubber mat
5
Circlip
Washer
Seal
Page 13
!
Basevalve RIGHT side (rebound leg)
1669-01, Sleeve
1693-01, Spring
530-22, Shims
338-11, O-ring
1670-01, Piston
Shim stack Comp.
Clamp Comp.
1674-01, Washer
1675-01, Nut
4803-11
(3 Nm , loctite 243)
Basevalve LEFT side (compression leg)
1675-01, Nut
1674-01, Washer
Clamp Comp.
Shim stack Comp.
1670-01, Piston
338-11, O-ring
530-22, Shims
1693-01, Spring
1669-01, Sleeve
1672-01, Collar
7.
Apply some front fork oil (1311-01) to the
inner tube surface and carefully mount the
outer tube (slide it completely down).
! WARNING!
Be careful not to damage the fork seal!
1672-01, Collar
1658-03, End piece
1658-01, End piece
WARNING!
438-02, End piece
438-02, O-ring
1242-09, Needle
1474-01, Spring
87
884-02 x 2, Ball
338-53, O-ring
8.
Fill up with Öhlins front fork oil (1311-01) all
the way to the edge of the reservoir. Continue to fill until the oil level is the same in
both the reservoir and in the cylinder tube.
9.
Push the gas piston, with teflon band
and O-ring fitted, to the reservoir bottom
9
Tool 720-02
without allowing it to be pressed back over
the circlip groove, make sure that there is
no air between the piston and the oil. Use
tool 720-02.
Close the compression adjuster.
13
Page 14
10.
Grip the piston shaft with soft jaws 727-02.
Fit the O-ring on the adjustment needle.
Apply plenty of red grease on the O-ring so
that the needle slides easily into the piston
shaft.
11.
Check the X-ring and O-ring on the seal
head. Replace if necessary. Smear plenty
of white grease on the X-ring before you fit
it. Use tool 0715-01 to get the X-ring into
the right position.
10.
Wrap some teflon tape arond the thread
of the shaft to protect the seal and O-ring
from damages. Apply some red grease
(146-01) to the tape and the shaft end.
Mount the seal head and the O-ring.
10
10
11
11
X-ring
O-ring
Tool 0715-01
Piston holder
Topout spring
Sleeve
Spacer
11.
Use a brass wire brush to clean the piston
rod from tape. Mount Spacer, Sleeve, Topout spring and the Piston holder.
12.
Tighten the Piston holder to a torque of 15
Nm.
13.
Refit the Compression/Rebound valve. Use
the picture below to make it right. Tighten
the 8 mm nut with a torque of 7 Nm.
LEG (RH)
REBOUND
CAUTION!
1675-01, Nut
1674-01 2x,
Washer
CAUTION!
LEG (LH)
COMPRESSION
2061-03, Piston
Shim stack
(rebound)
Clamp (rebound)
1675-01, Nut
1674-01, Washer
14
1674-01, Washer
Shim stack
Clamp (rebound)
(rebound)
Shim Stack
1447-02,
Piston ring
12
15 Nm
Shim stack
1447-02,
Pison ring
2061-03, Piston
525-18, Shims
(compression)
525-18, Shims
Clamp (comp.)
(compression)
Clamp (comp.)
530-22, Shims
1149-01, Wave
NOTE!
13
1654-09,
Piston holder
1654-09,
Piston holder
8 mm Nut (7 Nm)
Page 15
CAUTION!
The Washers must be positioned correctly
(Notice that there is a difference between
the compression and the rebound valve).
Also make sure to fi t the Wave washer
(1149-01) in the correct position (convex
side facing piston).
NOTE!
The right hand fork leg is the rebound leg.
The left hand fork leg is the compression
leg.
14.
Fit the Seal head tool and the Top-out
spring tool on the piston rod. Pull the Topout spring tool and, at the same time, push
the Seal head tool to contract the Top out
spring. Install tool 2810-01 on tool 176503 to keep the contraction. Assemble the
complete piston rod into the cartridge tube
and tight it by hand (3-4 turns).
NOTE!
Make sure that the gas piston is pressed
down completely
15.
Tighten the Seal head to 20 Nm. Use Seal
head tool (1797-04 and 1765-03).
NOTE!
14
15
Tool 1765-03
Tool 2810-01
Tool 1797-04
20 Nm
16
Tool 720-03
16.
Check the O-ring on the reservoir cap
assy. Replace if necessary. Apply some red
grease on the O-ring and push the reservoir cap assy into the chamber using tool
720-03.
17.
Fit the circlip. Make certain that it enters its
groove properly.
18.
Once again contract the top out spring
using tool 2810-01, tool 1765-03 and tool
1797-04
NOTE!
Nitrogen (N2) gas. Use pressure gauge
(1781-01)
17
18
15
Page 16
! WARNING!
!
Use of infl ammable gas for pressurising
the soch absorber can be hazardous. Use
nitrogen gas (N2) only!
WARNING!
19
20
19.
Check the gas pressure stipulated in the
spec. card. Dip the needle of the gas tool
(1781-01) in red grease and insert the needle through the gas filler valve.
Charge with gas to the correct pressure,
according to the spec. card.
NOTE!
Ensure that there is no leakage of gas or
fl uid.
20.
Screw the gas filler screw with O-ring.
Remove tool 2810-01 and tool 1797-04 to
release the top-out spring.
21.
Push tool 1765-03 to a stop and check the
oil level according to page 17.
NOTE!
Use Öhlins Front fork oil 1311-01 only.
22.
Refit the Pre-load tube. Install the spring
and refit the adjustment driver.
23
Refit the top nut assembly to the piston
shaft. Tighten the jam nut to 20 Nm.
NOTE!
21
3 Nm
22
Tool 1765-03
1311-01
Check the oil level
24.
Refit the top nut into the fork leg (use tool
797-01). Adjust the preload, compression
and rebound.
CAUTION!
The top nut should only be tightened by
23
20 Nm
CAUTION!
24
Tool 797-01
hand into the fork leg. The tightening force
of the triple clamp will hold it in locked
position.
16
Page 17
Oil level adjustment
Compared with conventional type of front
forks, the upside down front forks are very
sensitive to variations in oil level. Therefore,
adjust the oil level with special care.
A change in the fork oil level will not affect
the spring force at the beginning of the fork
travel, but will have a great effect at the
end of the travel.
When the oil level is raised:
The air spring in the later half stage of
travel is stronger, and make the front forks
more progressive.
When the oil level is lowered:
The air spring of the travel is lessened, and
thus the front fork less progressive. The
oil level works most efficient at the end of
the fork travel. Air spring characteristics
shown, is a general card description to understand the difference when the oil level is
changed.
NOTE!
Adjust the oil level in mm according to the
fi gure with the fork leg fully compressed.
For the right oil-level, please see the specifi cation card.
Air spring characteristics
Air inside the front fork works as a spring.
The graph at the bottom of the page shows
the spring force related to stroke when the
oil level is changed between 140 mm and
200 mm. Standard oil level is 180 mm.
Öhlins front fork fl uid 1311-01
Push to a stop,
use tool 1765-03
Check the oil level
17
Page 18
Troubleshooting
Below are a few examples of how to adjust
for the most common road holding problems in Road Racing driving.
1.
The front wheel “chatters” entering a
corner, the problem goes away, as soon as
you let the brakes off, or when you get on
the power.
• This is caused by the fact that the fork is working
too low in the travel and reaches the progressive,
hard part at the end of the travel.
• Put on more pre-load.
• Change to a harder spring.
• If a lot of stroke remains after riding, drop the oil
level. See oil level chart.
• Make sure the front forks have no friction.
• Rear ride height is to high, too much rear spring
pre-load.
• Lower the rear end by taking off pre-loadfrom rear
shock spring.
2.
The front wheel is jumping during the last
part of braking.
• If a lot of stroke remains, the oil level is too high.
Lower the oil level.
• If the fork is bottoming, put in harder springs and
keep the oil level.
4.
The front end loses grip coming out of a
corner.
• Not enough rebound damping. Put on some more
rebound damping.
• Too much pre-load. Take off some pre-load.
• Rear end is too soft. Put on a harder rear spring.
• Front end is too high. Lower the front end by
pulling the fork legs through the triple clamps.
As mentioned in the beginning, the whole
bike setup affects the front forks. Try to
understand the feelings and work step by
step.
NOTE!
Our advice is to change only one thing at a
time and do everything step by step.
1
3.
The front end feels unpredictable and unsafe in the middle of the corner (between
braking and getting on power).
• Not enough rebound damping. Put on more
damping.
• Too much rebound damping. If it at the same time
feels harsh, take off some rebound damping.
• Too much compression damping. Also gives a
harsh feeling. Take off some compression
damping.
18
4
Page 19
Guidelines
The settings on this pressurised Front
Fork are based on what currently is being
used in Moto GP racing, furthermore the
delivery spec is something we like to refer
to as a “balanced setting”. This means that
the pressure drop over the bottom valves
(base valves) and the top pistons (ø25mm)
are matched.
In order to avoid an unnecessary high internal pressure or risk of cavitation, please
use the following guide lines when adjusting the front fork.
The FG 670 front fork can be divided into
two parts. One being the so-called
rebound leg (right leg), and one the
compression leg (left leg).
Compression adjustment
Left Hand Fork Leg
Clockwise turn
closes = increase
compression
damping
Counter clockwise
turn opens = reduce
compression damping
Tool 794-01
Rebound adjustment
Right Hand Fork Leg
Clockwise turn
closes = increase
rebound damping
Counter clockwise
turn opens = reduce
rebound damping
Tool 794-01
Start click position in this example:
Rebound (Top right) = 10 clicks open,
Rebound base (bottom right) = 16, never
adjust
Compression (top left) = 12
Compression base (bottom left) = 12
Rebound damping adjustment.
The rebound damping is adjusted on the
top of the right leg. Standard click position
is 10 clicks open from fully closed position.
The recommended range of adjustment
with this setting is 6-16 clicks open from
fully closed position.
Compression damping adjustment.
As said earlier the compression damping on this Front fork (FG 570) has been
checked for balance at the factory before delivery. In order not to change this
matched pressure balance between the
25mm valves (main piston) and the base
valves (bottom left and right leg), please
use the following guidelines.
By changing both the top and bottom
compression adjusters at the same time
you have a greater chance of keeping the
pressure balance between these adjusters
more constant.
For individual adjustments, see next page.
Compression adjusment reservoir valve (Base valve))
Counter clockwise turn opens =
reduce compression damping
Tool 794-01
Clockwise turn closes =
increase compression damping
19
Page 20
Individual adjustments
Individual adjustments
Below you can find the recommended adjustment range for the top left compression
leg adjuster, with different positions on the
bottom base valve. From soft to hard:
Base 19 clicks, top 17-20 clicks
SOFT
Base 16 clicks, top 14-18 clicks
Base 12 clicks, top 11-14 clicks
HARD
Base 10 clicks, top 10-12 clicks
Base valve:
The left bottom base valve can be adjusted from 8- 13 clicks, if top compression
is set at 12 clicks open.
Compression adjustment
Left Hand Fork Leg
Clockwise turn
closes = increase
compression
damping
Counter clockwise
turn opens = reduce
compression damping
Compression adjusment reservoir valve (Base valve))
Counter clockwise turn opens =
reduce compression damping
Tool 794-01
Tool 794-01
Rebound adjustment
Right Hand Fork Leg
Clockwise turn
closes = increase
rebound damping
Counter clockwise
turn opens = reduce
rebound damping
Clockwise turn closes =
increase compression damping
Tool 794-01
Other tips and tricks
For on track adjustments and satisfying
your riders needs we could also look at the
adjuster from this angle:
1.
The compression damping from your left
base valve can be adjusted when you need
more compression damping, but you don’t
want the damping to react too quick! Let’s
say the rider needs more damping during
braking, then close the bottom adjuster 1-3
clicks since this adjustment will have time
to react during braking, but will allow the
front fork to go smoothly over bumps at
hard cornering.
2.
If the rider complains about lack of ”tire
feel” you can improve this by closing the
top left compression adjuster (2-3 clicks)
since these adjustments will give a quicker
response. This could also improve the
rider’s initial dive of the front fork when he
is applying the front brake NB! By closing
this adjuster too much, can also remove
some comfort and make the fork feel hard
and harsh.
Should the above instructions not be
enough or the standard setting somehow
not meeting the needs for you riders, then
please contact Öhlins racing AB Sweden
for setting information rather than attempting to modify the setting yourself. We have
a vast setting bank for this front fork with
balanced and matched settings to choose
from.
20
Page 21
Notes
21
Page 22
Technical information
Fork length: 730 mm.
Stroke: 130 mm.
Free spring length: 260 mm.
Rebound adjustment:
Base setting 9-12 “clicks”.
Maximum open valve 20 “clicks”.
Compression adjustment:
Base setting 6-16 “clicks”.
Maximum open valve 20 “clicks”.
Compression adjustment (Base valve):
Base setting 6-16 “clicks”.
Maximum open valve 20 “clicks”.
Spring pre-load adjustment:
0-18 mm (0-18 turns).
Spring rate:
4744-95 9.5 N/mm (marking -95).
Optional springs supplied:
4744-10 10.0 N/mm (marking -10)
4744-90 9.0 N/mm (marking -90)
Optional springs:
4744-85 8.5 N/mm (marking -85)
4744-80 8.0 N/mm (marking -80)
Oil Capacity:
Please see specification card.
Use Öhlins high performance front fork
fluid No. 5 (1311-01) only.
Tighten torque:
Lower triple clamp bolt 12-15 Nm.
Upper triple clamp bolt 18-22 Nm
Tighten torque, Loctite and Grease:
Grease:
Öhlins front fork grease 146-01
(red grease).
Service interval:
Every 10 hours
22
Page 23
Spare parts list, FG 670
1
2
3
4
5
4
6
7
8
9
10
11
37
39
40
12
13
14
52
15
16
17
18
19
20
21
22
23
24
25
26
27
28
52
51
50
34
35
36
38
49
48
47
43
42
46
41
45
44
Pos. Part No. Pcs. Description Type/remarks
1 04732-05 2 Top nut assembly See page 24
2 01408-04 2 Adjustment driver
3 04744-95
04744-10
04744-90
4 01438-04 4 Guide ring
5 01460-46 2 Preload tube
6 01900-06 2 Fork leg outer
7 01683-02 2 Bushing, upper
8 01684-02 2 Bushing, lower
9 04758-01 2 Washer
10 04720-02 2 Seal
11 04759-01 2 Circlip
12 02807-01 2 Adjustment rod
13 01901-04 2 Rod extensioner
14 02302-08 2 Guide sleeve
29
15 01440-01 2 Bump rubber
16 01651-04 2 Seal head
17 01027-04 2 X-ring
18 00438-02 2 O-ring
19 01056-04 2 Bushing
20 00438-41 2 O-ring
30
21 02803-01 2 Spacer
22 01653-05 2 Sleeve
23 04718-04 2 Topout spring
24 01698-30 2 Rebound needle
31
25 00338-14 2 O-ring
26 02368-01 2 Shaft
27 - 1 Compression valve (LH) See page 25
28 - 1 Rebound valve (RH) See page 25
29 01656-02 2 Cylinder tube
30 00338-72 2 O-ring
31 01700-01 2 Fork leg inner
32 01565-04 1 Stroke indicator
33 00338-63 1 O-ring
32
34 00191-17 2 Sticker “Ö”
33
35 04759-02 2 Circlip
36 01682-28 2 Fender bracket ring
37 01678-14 2 Fender bracket
38 00382-08 2 Screw
39 01902-13
01902-1411
40 01240-08 4 Bolt Titan
41 00438-33 2 O-ring
42 00382-07 2 Screw
43 01669-02 4 Caliper sleeve
44 - 2 Base valve See page 24
45 00338-72 2 O-ring
46 02804-01 2 Reservoir tube
47 00338-25 2 O-ring
48 01447-02 2 Piston ring
49 02806-01 2 Gas piston
50 00161-08 2 Reservoir end kit
51 01152-01 2 Circlip
52 00196-01 2 Sticker “Warning”
2
Spring
2
Option spring
2
Option spring
Fork bottom
Fork bottom
25.5/260/9.5
25.5/260/10.0
25.5/260/9.0
Left
Right
23
Page 24
Top nut assy
1
2
3
4
3
6
7
8
9
10
11
12
5
Base valve
17
18
19
20
21
22
23
24
25
26
Spare parts list, Top nut assey
Pos. Part No. Pcs. Description Type/remarks
1 01473-01 2 Circlip
2 01467-03 2 Needle
3 00884-04 4 Ball
4 01474-01 2 Spring
5 00577-01 2 O-ring
6 03312-01 2 Adjuster
7 03309-01 2 Thin Shim
8 00338-72 2 O-ring
9 03318-05 2 Housing
10 00338-02 2 O-ring
11 03309-01 2 Thin Shim
12 03317-01 6 Wave washer
13 03309-02 2 Thick shim
14 03313-01 2 Nut
15 03315-01 2 Preload socket
16
Spare parts list, Base valve
Pos. Part No. Pcs. Description Type/remarks
16 04803-11 1 Jet (RH) Rebound leg
17 01675-01 2 Nut
18 01674-01 2 Washer
19 - 2 Clamp compression See spec. card
20 - - Shim stack See spec. card
21 01670-01 2 Piston compression
22 00338-11 2 O-ring
23 00530-22 2 Shims
24 01693-01 2 Spring
25 01669-01 2 Sleeve
26 01672-01 2 Spring collar
27 01658-01 1 End piece (LH) Comp. leg
28 01658-03 1 End piece (RH) Rebound leg
29 00438-02 2 O-ring
30 01242-09 1 Adjustment needle (LH) Comp. leg
31 00884-02 2 Ball (LH) Comp. leg
32 01474-01 1 Spring (LH) Comp. leg
33 00338-53 1 O-ring (LH) Comp. leg
34 01473-02 1 Circlip(LH) Comp. leg
24
13
14
15
27 28
29
31
32
31
30
33
34
Page 25
Compression valve
1
Rebound valve
2
3
4
14
Spare parts list, Compression valve (LH)
Pos. Part No. Pcs. Description Type/remarks
1 01654-09 1 Piston holder
2 00530-22 1 Shims
3 01149-01 1 Wave washer
4 00525-18 2 Shims
5 - 1 Washer See spec. card
6 - - Shim stack (comp.) See spec. card
7 01447-02 1 Piston ring
8 02061-03 1 Piston
9 - - Shim stack (reb.)
10 - 1 Washer See spec. card
11 01674-01 2 Washer
13 01675-01 1 Nut
5
6
7
8
9
10
11
13
15
16
17
18
19
20
21
22
Spare parts list, Rebound valve (RH)
Pos. Part No. Pcs. Description Type/remarks
14 01654-09 1 Piston holder
15 - 1 Washer See spec. card
16 - - Shim stack (comp.) See spec. card
17 01447-02 1 Piston ring
18 02061-03 1 Piston
19 - - Shim stack (reb.) See spec. card
20 - 1 Washer (reb.) See spec. card
21 01674-01 2 Washer
22 01675-01 1 Nut
25
Page 26
Service tools
1
2
5
4
10
11
15
Pos. Part No. Pcs. Description
1 00727-02 1 Soft jaws (one pair)
3
6-9
13
12
14
2 00786-05 1 Inner tube tool
3 00786-07 1 Cartridge tube tool
4 01781-01 1 Gas tool
5 00797-01 1 Top nut socket
6 01757-01 1 Attachment bar
7 01759-07 1 Dismantling bar
8 01759-08 1 Installing sleeve
9 01758-04 1 Guide ring
10 00720-02 1 Measure pin
11 00720-03 1 Pin tool
12 01765-03 1 Pull-up spring tool
13 01797-04 1 Seal head tool
14 02810-01 1 Pull-up spring tool holder
15 00715-01 1 Screwdriver
26
Page 27
Notes
27
Page 28
More info
www.ohlins.com
Öhlins Racing AB, Box 722, S-194 27 Upplands Väsby, Sweden
Phone +46 8 590 025 00, Fax +46 8 590 025 80
07280-12D, Issued 06 07 26. Öhlins Racing AB, Mattias Johansson, majo/ Update: Tiina Harakka
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