WP XACT PRO 8950 User manual

OWNER'S MANUAL
XACT PRO 8950
Art. no. 53000175en
http://www.wp-suspension.com

DEAR WP CUSTOMER
*53000175en*
53000175en
02/2019
DEAR WP CUSTOMER
Congratulations on your decision to purchase a WP chassis component. You are now the owner of a state-of-
the-art sports chassis that you will continue to enjoy for a long time if you maintain it properly.
We wish you good and safe riding at all times!
The Owner's Manual contained the latest information for this model series at the time of going to print. How-
ever, minor differences due to further developments in design cannot be ruled out completely.
All specifications contained herein are non-binding. WP Suspension GmbH specifically reserves the right to
modify or delete technical specifications, prices, colors, forms, materials, services, designs, equipment, etc.,
without prior notice and without providing reasons, to adapt these to local conditions, as well as to stop the
production of a particular model without prior notice. WP accepts no liability for delivery options, deviations
from figures and descriptions, misprints, and other errors. The models portrayed partly contain special equip-
ment that does not belong to the regular scope of supply.
© 2019 WP Suspension GmbH, Mattighofen Austria
All rights reserved
Reproduction, even in part, as well as copying of all kinds, is permitted only with the express written permission
of the copyright owner.
WP Suspension GmbH
Stallhofnerstraße 3
5230 Mattighofen, Austria
This document is valid for the following models:
XACT PRO 8950 (18.18.0T.07)

TABLE OF CONTENTS
2
TABLE OF CONTENTS
1 MEANS OF REPRESENTATION........................ 3
1.1 Symbols used ....................................... 3
1.2 Formats used........................................ 3
2 SAFETY ADVICE ............................................... 4
2.1 Use definition –intended use ............... 4
2.2 Misuse................................................... 4
2.3 Safety advice ........................................ 4
2.4 Degrees of risk and symbols ................ 4
2.5 Safe operation....................................... 5
2.6 Work rules............................................. 5
2.7 Environment.......................................... 5
2.8 Owner's Manual.................................... 5
2.9 Correct installation................................ 6
2.10 Chassis tightening torques ................... 6
3 IMPORTANT NOTES ......................................... 7
3.1 Manufacturer and implied warranty...... 7
3.2 Fuel, auxiliary substances..................... 7
3.3 Spare parts, accessories ...................... 7
3.4 Service .................................................. 7
3.5 Figures .................................................. 7
3.6 Customer service.................................. 7
4 SERIAL NUMBERS............................................ 8
4.1 Shock absorber article number ............ 8
5 PREPARING FOR USE...................................... 9
5.1 Advice on preparing for first use........... 9
6 RIDING INSTRUCTIONS ................................. 10
6.1 Checks and maintenance measures
when preparing for use....................... 10
7 SERVICE SCHEDULE...................................... 11
7.1 Additional information......................... 11
7.2 Required work..................................... 11
7.3 Recommended work........................... 11
8 SERVICE WORK ON THE CHASSIS ............... 12
8.1 Raising the motorcycle with a lift
stand ................................................... 12
8.2 Removing standard shock
absorber .......................................... 12
8.3 Installing the WP PRO
COMPONENTS shock absorber ..... 12
8.4 Removing the motorcycle from the
lift stand .............................................. 12
9 TUNING THE CHASSIS................................... 14
9.1 Checking the basic chassis setting
with rider's weight............................... 14
9.2 Compression damping of the shock
absorber.............................................. 14
9.3 Shock absorber rebound damping..... 14
9.4 Adjusting the low-speed
compression damping of the shock
absorber.............................................. 15
9.5 Adjusting the high-speed
compression damping of the shock
absorber.............................................. 15
9.6 Adjusting the low-speed rebound
damping of the shock absorber.......... 16
9.7 Adjusting the high-speed rebound
damping of the shock absorber.......... 17
9.8 Measuring the rear wheel dimension
unloaded ............................................. 18
9.9 Checking the static sag of the
shock absorber ................................... 18
9.10 Checking the riding sag of the
shock absorber ................................... 19
9.11 Adjusting the spring preload of the
shock absorber ................................... 19
9.12 Adjusting the riding sag .................. 20
10 TECHNICAL DATA .......................................... 21
10.1 Shock absorber .................................. 21
11 SUBSTANCES................................................. 23
12 STANDARDS ................................................... 24
13 LIST OF ABBREVIATIONS .............................. 25
INDEX ...................................................................... 26

MEANS OF REPRESENTATION 1
3
1.1 Symbols used
The meaning of specific symbols is described below.
Indicates an expected reaction (e.g. of a work step or a function).
Indicates an unexpected reaction (e.g. of a work step or a function).
All work marked with this symbol requires specialist knowledge and technical understand-
ing. In the interest of your own safety, have these jobs performed by a WP Authorized Cen-
ter! There your WP chassis will be treated with the optimum care and attention by specially
trained experts using the necessary special tools.
Indicates a page reference (more information is provided on the specified page).
Indicates information with more details or tips.
Indicates the result of a testing step.
Indicates the end of an activity, including potential rework.
1.2 Formats used
The typographical formats used in this document are explained below.
Proprietary name Indicates a proprietary name.
Name®Indicates a protected name.
Brand™ Indicates a brand available on the open market.
Underlined terms Refer to technical details or indicate technical terms, which are explained
in the glossary.

2 SAFETY ADVICE
4
2.1 Use definition –intended use
This chassis component is designed and built to withstand the normal stresses and strains of regular racing.
Info
Only use this chassis component in closed-off areas remote from public road traffic.
Only use this chassis component in the vehicle for which the chassis component is approved and/or
recommended.
2.2 Misuse
The chassis component must only be used as intended.
Dangers can arise for people, property and the environment through use not as intended.
Any use of the chassis component beyond the intended and defined use constitutes misuse.
Misuse also includes the use of operating and auxiliary fluids which do not meet the required specification for
the respective use.
2.3 Safety advice
A number of safety instructions need to be followed to operate the product described safely. Therefore read
this instruction and all further instructions included carefully. The safety instructions are highlighted in the text
and are referred to at the relevant passages.
Info
Various information and warning labels are attached in prominent locations on the product described.
Do not remove any information or warning labels. If they are missing, you or others may not recognize
dangers and may therefore be injured.
2.4 Degrees of risk and symbols
Danger
Identifies a danger that will immediately and invariably lead to fatal or serious permanent injury if the
appropriate measures are not taken.
Warning
Identifies a danger that is likely to lead to fatal or serious injury if the appropriate measures are not
taken.
Caution
Identifies a danger that may lead to minor injuries if the appropriate measures are not taken.
Note
Identifies a danger that will lead to considerable machine and material damage if the appropriate measures are
not taken.

SAFETY ADVICE 2
5
2.5 Safe operation
Danger
Danger of accidents A rider who is not fit to ride poses a danger to him or herself and others.
–Do not operate the vehicle and use chassis components if you are not fit to ride due to alcohol,
drugs or medication.
–Do not operate the vehicle and use chassis components if you are physically or mentally impaired.
Warning
Danger of burns The damper gets very hot when the vehicle is driven.
–Do not touch the damper before it has cooled down.
–Allow the damper to cool down before performing any work.
Only use the chassis component when it is in perfect technical condition, in accordance with its intended use,
and in a safe and environmentally compatible manner.
If there are faults, which impair safety, have them immediately remedied in a WP Authorized Center.
Adhere to the information and warning labels on the chassis component.
2.6 Work rules
Special tools are necessary for certain tasks. The tools are not a component of the chassis component, but can
be ordered using the number in parentheses.
During assembly, use new parts to replace parts which cannot be reused (e.g., seals, seal rings, O-rings).
In the case of certain screws, a thread locker (e.g. Loctite®) is required. Observe the manufacturer's instruc-
tions.
After disassembly, clean the parts that are to be reused and check them for damage and wear. Change dam-
aged or worn parts.
After completing a repair or service work, check the operating safety of the chassis component.
2.7 Environment
If you use your chassis component responsibly, you can ensure that problems and conflicts do not occur.
When disposing of used oil, other operating and auxiliary fluids, and used components, comply with the laws
and regulations of the respective country.
2.8 Owner's Manual
It is important that you read this Owner's Manual carefully and completely before making your first trip. The
Owner's Manual contains useful information and many tips on how to operate, handle, and service your motor-
cycle. This is the only way for you to find out how to set up the chassis component ideally and how to protect
yourself from injury.
Keep the Owner's Manual in an accessible place to enable you to refer to it as needed.
If you would like to know more about the chassis component or have questions on the material you read,
please contact a WP Authorized Center.
The Owner's Manual is an important part of the chassis component and must be handed over to the new
owner if the vehicle is sold.

2 SAFETY ADVICE
6
2.9 Correct installation
Correct installation analogously to original components and in accordance with the instructions of the vehicle
manufacturer is essential for ensuring maximum safety and functionality.
It is therefore strongly recommended that you have the chassis component installed at a WP Authorized Cen-
ter.
2.10 Chassis tightening torques
Unless otherwise stated, the tightening torques that apply are those in the vehicle manufacturer's instructions.

IMPORTANT NOTES 3
7
3.1 Manufacturer and implied warranty
The work prescribed in the service schedule must be carried out in a WP Authorized Center only, since other-
wise no warranty claims will be recognized. Damage or secondary damage caused by tampering with and/or
conversions on the chassis component are not covered by the warranty.
3.2 Fuel, auxiliary substances
The fuel and auxiliary substances specified in the Owner's Manual must be used in accordance with the speci-
fications.
3.3 Spare parts, accessories
For your safety, only use spare parts and accessory products that are approved and/or recommended by WP
and have them installed in a WP Authorized Center. WP accepts no liability for other products and any resulting
damage or loss.
Certain spare parts and accessory products are specified in parentheses in the descriptions. Your WP Autho-
rized Center will be pleased to advise you.
3.4 Service
A prerequisite for perfect operation and prevention of premature wear is that the service, care, and tuning work
is properly carried out as described in the Owner's Manual. Incorrect adjustment and tuning of the chassis and
suspension can lead to damage and breakage of components.
Use of the chassis component under difficult conditions, such as on sand or on wet and muddy surfaces, can
lead to considerably more rapid wear. For this reason, it may be necessary to inspect or replace parts before
the next scheduled service.
It is imperative that you adhere to the stipulated service intervals. If you observe these exactly, you will ensure a
much longer service life for your chassis component.
3.5 Figures
The figures contained in the manual may depict special equipment.
In the interest of clarity, some components may be shown disassembled or may not be shown at all. It is not
always necessary to disassemble the component to perform the activity in question. Please follow the instruc-
tions in the text.
3.6 Customer service
If you have any questions about your chassis component or WP, your WP Authorized Center will be pleased to
advise you.
A list of WP Authorized Centers can be found on the WP website.
International WP Suspension website: http://www.wp-suspension.com

4 SERIAL NUMBERS
8
4.1 Shock absorber article number
M01599-10
The shock absorber article number 1is stamped on the base of
the shock absorber.
Info
The shock absorber article number consists of an eight-
figure number with a single letter in the sixth position.

PREPARING FOR USE 5
9
5.1 Advice on preparing for first use
Warning
Danger of accident Modifications to the suspension setting may seriously alter the handling charac-
teristic.
Extreme modifications to the suspension setting may cause a serious deterioration in the handling
characteristic and overload components.
–Only make adjustments within the recommended range.
–Ride slowly to start with after making adjustments to get the feel of the new handling characteristic.
–Adjust the chassis component for yourself before using it for the first time.

6 RIDING INSTRUCTIONS
10
6.1 Checks and maintenance measures when preparing for use
Info
Before every use, check the condition of the chassis component and ensure that it is safe to operate.
The chassis must be in perfect technical condition when it is being operated.
H02560-01
–Check chassis component for damage.

SERVICE SCHEDULE 7
11
7.1 Additional information
Any further work that results from the required work or from the recommended work must be ordered sepa-
rately and can be invoiced separately.
Different service intervals may apply in your country, depending on the local operating conditions.
7.2 Required work
Every 40 operating hours
Service the shock absorber. ●
●Periodic interval
7.3 Recommended work
Once after 20 operating hours
Service the shock absorber. ○
○One-time interval

8 SERVICE WORK ON THE CHASSIS
12
8.1 Raising the motorcycle with a lift stand
Note
Danger of damage The parked vehicle can roll away or fall over.
–Park the vehicle on a firm and level surface.
401942-01
–Raise the motorcycle in accordance with the instructions of
the vehicle manufacturer.
Neither wheel is in contact with the ground.
–Secure the motorcycle against falling over.
8.2 Removing standard shock absorber
H03314-10
–Remove the standard shock absorber as per the instructions
of the vehicle manufacturer.
8.3 Installing the WP PRO COMPONENTS shock absorber
H03314-11
–Install the shock absorber in accordance with the instructions
of the vehicle manufacturer.
8.4 Removing the motorcycle from the lift stand
Note
Danger of damage The parked vehicle can roll away or fall over.
–Park the vehicle on a firm and level surface.

SERVICE WORK ON THE CHASSIS 8
13
H03151-01
–Remove the motorcycle from the lift stand as per the instruc-
tions of the vehicle manufacturer.
–Remove the lift stand.

9 TUNING THE CHASSIS
14
9.1 Checking the basic chassis setting with rider's weight
401030-01
–For optimal motorcycle riding characteristics and to avoid
damage to forks, shock absorbers, link fork and frame, the
basic settings of the suspension components must match the
rider's weight.
–This chassis component is factory set to a standard rider's
weight.
Guideline
Standard rider weight 75 … 85 kg (165 … 187 lb.)
–If the rider's weight is above or below this range, the basic
setting of the suspension components must be adjusted
accordingly.
–Small weight differences can be compensated by adjust-
ing the spring preload, but in the case of large weight differ-
ences, the springs must be replaced.
9.2 Compression damping of the shock absorber
The compression damping of the shock absorber is divided into two ranges: high-speed and low-speed.
High-speed and low-speed refer to the compression speed of the rear wheel suspension and not to the vehicle
speed.
The high-speed setting, for example, has an effect on the landing after a jump: the rear wheel suspension com-
presses quickly.
The low-speed setting, for example, has an effect when riding over long ground swells: the rear wheel suspen-
sion compresses slowly.
These two ranges can be adjusted separately, although the transition between high-speed and low-speed is
gradual. Thus, modifications in the high-speed range affect the compression damping in the low-speed range
and vice versa.
9.3 Shock absorber rebound damping
The rebound damping of the shock absorber is divided into two ranges: high-speed and low-speed.
High-speed and low-speed refer to the rebound suspension speed of the rear wheel and not to the vehicle
speed.
The high-speed setting affects, for example, the rebound of the rear wheel after a jump and the traction when
the rear wheel rebounds quickly.
The low-speed setting affects the overall vehicle balance.
These two ranges can be adjusted separately, although the transition between high-speed and low-speed is
gradual. Consequently, modifications in the high-speed range affect the rebound in the low-speed range and
vice versa.

TUNING THE CHASSIS 9
15
9.4 Adjusting the low-speed compression damping of the shock absorber
Caution
Risk of injury Parts of the shock absorber will move around if the shock absorber is detached incor-
rectly.
The shock absorber is filled with highly compressed nitrogen.
–Please follow the description provided. (Your WP Authorized Center will be pleased to assist you.)
Info
The effect of the low-speed setting can be seen in slow to normal compression of the shock absorber.
M01596-11
–Turn adjusting screw 1clockwise with a hexagon socket
wrench up to the last perceptible click.
Info
The low-speed adjuster is the lower adjuster L.
–Turn counterclockwise by the number of clicks correspond-
ing to the shock absorber type.
Guideline
Low-speed compression damping
125/150/250 SX EU
TC 125/150/250 EU
12 clicks
250 SX‑F EU
FC 250 EU
10 clicks
350/450 SX‑F EU,
125/250 SX US,
250/350/450 SX‑F US
FC 350/450 EU,
TC 125/250 US,
FC 250/350/450 US
15 clicks
Info
Turn clockwise to increase damping; turn counter-
clockwise to reduce damping during slow to normal
compression.
9.5 Adjusting the high-speed compression damping of the shock absorber
Caution
Risk of injury Parts of the shock absorber will move around if the shock absorber is detached incor-
rectly.
The shock absorber is filled with highly compressed nitrogen.
–Please follow the description provided. (Your WP Authorized Center will be pleased to assist you.)
Info
The effect of the high-speed setting can be seen in fast compression of the shock absorber.

9 TUNING THE CHASSIS
16
M01596-10
–Turn adjusting screw 1clockwise with a hexagon socket
wrench up to the last perceptible click.
Info
The high-speed adjuster is upper adjuster H.
–Turn counterclockwise by the number of clicks correspond-
ing to the shock absorber type.
Guideline
High-speed compression damping
125/150/250 SX EU,
450 SX‑F EU
TC 125/150/250 EU,
FC 450 EU
38 clicks
250 SX‑F EU
FC 250 EU
35 clicks
350 SX‑F EU,
125/250 SX US,
250/350/450 SX‑F US
FC 350 EU,
TC 125/250 US,
FC 250/350/450 US
40 clicks
Info
Turn clockwise to increase damping; turn counter-
clockwise to reduce damping during fast compres-
sion.
9.6 Adjusting the low-speed rebound damping of the shock absorber
Caution
Risk of injury Parts of the shock absorber will move around if the shock absorber is detached incor-
rectly.
The shock absorber is filled with highly compressed nitrogen.
–Please follow the description provided. (Your WP Authorized Center will be pleased to assist you.)
M01597-10
–Turn adjusting screw 1clockwise up to the last perceptible
click.
Info
The low-speed adjuster is adjuster REB.
–Turn counterclockwise by the number of clicks correspond-
ing to the shock absorber type.

TUNING THE CHASSIS 9
17
Guideline
Low-speed rebound damping
125/150 SX EU,
350 SX‑F EU
TC 125/150 EU,
FC 350 EU
20 clicks
250 SX EU,
250/450 SX‑F EU,
125/250 SX US,
250/350/450 SX‑F US
TC 250 EU,
FC 250/450 EU,
TC 125/250 US,
FC 250/350/450 US
25 clicks
Info
Turn clockwise to increase the damping; turn counter-
clockwise to reduce the damping at a slow rebound
speed.
9.7 Adjusting the high-speed rebound damping of the shock absorber
Caution
Risk of injury Parts of the shock absorber will move around if the shock absorber is detached incor-
rectly.
The shock absorber is filled with highly compressed nitrogen.
–Please follow the description provided. (Your WP Authorized Center will be pleased to assist you.)
M01597-11
–Turn adjusting screw 1clockwise up to the last perceptible
click.
Info
The high-speed adjuster is adjuster TXN.
–Turn counterclockwise by the number of clicks correspond-
ing to the shock absorber type.
Guideline
High-speed rebound damping
125/150/250 SX EU,
250/350/450 SX‑F EU,
125/250 SX US,
250/450 SX‑F US
TC 125/150/250 EU,
FC 250/350/450 EU,
TC 125/250 US,
FC 250/450 US
15 clicks
350 SX‑F US
FC 350 US
20 clicks

9 TUNING THE CHASSIS
18
Info
Turn clockwise to increase the damping; turn coun-
terclockwise to reduce the damping at a fast rebound
speed.
9.8 Measuring the rear wheel dimension unloaded
Preparatory work
–Raise the motorcycle with a lift stand. ( p. 12)
400988-10
Main work
–Measure the distance –as vertical as possible –between the
rear axle and a fixed point, for example, a mark on the side
cover.
–Note down the value as dimension A.
Finishing work
–Remove the motorcycle from the lift stand. ( p. 12)
9.9 Checking the static sag of the shock absorber
400989-10
–Measure dimension Aof rear wheel unloaded. ( p. 18)
–Hold the motorcycle upright with the aid of an assistant.
–Measure the distance between the rear axle and the fixed
point again.
–Note down the value as dimension B.
Info
The static sag is the difference between measure-
ments Aand B.
–Check the static sag.
Static sag
125/150/250 SX EU,
250/350/450 SX‑F EU,
125/250 SX US
TC 125/150/250 EU,
FC 250/350/450 EU,
TC 125/250 US
38 mm (1.5 in)
FC 250/350/450 US 40 mm (1.57 in)
» If the static sag is less or more than the specified value:
–Adjust the spring preload of the shock absorber.
( p. 19)