Safety Caution
Caution When installing!

WARNING

Special knowledge is required to replace the front fork, rear cushion unit. If someone without special
knowledge performed installation, and the installation was improper, it may cause damage on the motorcycle
and accident. Please make sure that replacement is conducted in a dealership or controlled environment
where there are technicians with special knowledge and skills.
If the product is installed on a modified motorcycle, it may cause function and performance deterioration.
Install this product only on a motorcycle with genuine parts of its manufacturer.

! CAUTION

This product is a precision machine part. Deformation and dent from a drop, hammer, and shock may cause
function and performance deterioration. When handling and installing the product, do not drop, hammer, andapply shock.
If only one person handles the product, there may be a case that a motorcycle and parts cannot be held byhimself/herself. Make sure 2 or more people work when removing and installing the product.

Caution when Using! WARNING! CAUTION

High-pressure nitrogen gas is filled in this product. When disassembling and refilling nitrogen gas, theproduct may burst causing serious injury. If exposed to flames and puncture a hole, this product may burst
causing serious injury. Replacement and discarding must be done by a specified dealership.
There are recommended inspection items for this product to maintain its performance. If not inspected anddefects are ignored, it may cause function and performance deterioration. When using, make sure to performthe necessary inspection items described in this manual.
Always use the oils specified by SHOWA. When unspecified oils are used, it may cause function andperformance deterioration.

※This product is dedicated for race , so it is not covered by warranty. It is not covered by warranty if it is usedoutside of a race or on a vehicle outside a race circuit. Please use oil dedicated for this model.
Please contact a dealer for details.

Overview
List of Specification FF

SpringOperation oil

Damping
force

List of Specification
A-kit

19Y STD

Rate(N/mm)

5.0

5.0

Type of oil

A15-00

SS19

Amount of oil inthe damper

243cc

243cc

Amount of oil inthe outer tube

315cc

356cc

COMP

Max-20clicksMax-12
clicksREBMax-20
clicks

Max-8
clicks

RCA-kit

19Y STD

Rate(N/mm)

5656

Type of oil

SS25

SS25

Oil level ofdamper

370cc

370cc

Filled gas
pressurekPa

900980Rod size

φ1816

COMP (Low)

Max-20clicksMax-10clicksCOMP (High)

MAX-3 turnMAX-3・1/3turn

REB

Max-20clicksMax-19clicksSpringOperation oil

Damping
force

Necessary Inspection Items
Before riding

Semi-annually

Annually

Check of outer appearance: loose Bolt, cracks,deformations

ㇾㇾㇾ

Operation check of the front fork suspension.

ㇾㇾㇾ

Oil leakage of the front fork suspension.

ㇾㇾㇾOperation check of the rear suspension operation.

ㇾㇾㇾ

Oil leakage of the rear suspension operation.

ㇾㇾㇾManual for A-Kit FF
For details of removing and mounting, please refer to the 18YM CRF450R Owner’S/
Service Manual of the motorcycle manufacturer.

①air pressureadjustment②compression
damping adjuster①air pressure adjustment
1.Before riding, but the bike invertical position. The front wheel
should be off the ground before
release the pressure
2.Install and tighten the pressure
release screw with the specified
torque：1.3 N・ｍ②compression dampingadjusterUse the right size tool for
adjusting the compression
adjuster on the Fork cap.
（8 clicks/1 full turn）
clockwise
HARD
counterclockwise SOFT

！ CAUTION：
Do not force to turn fromthe position that stops
lightly for the Soft side andHard side. It may causeinternal damage.

③rebound damping
adjusterAxle bolts
Tightening torque：20N・ｍ③Rebound Damping
Adjustment
Use the right size tool for
adjusting the rebound adjusteron the Forks centre bolt
（8 clicks/1 full turn）
clockwise
HARD
counterclockwise SOFT

Manual for A-Kit RC
For details of removing and mounting, please refer to the 18YM CRF450R Owner’S/
Service Manual of the motorcycle manufacturer.

①High speedCompression
damping adjuster①:High speed compression damping
adjuster
Use the right size tool for adjusting the 【１】High speed compression damping adjuster on
the Rear Shock absorberclockwise
HARD
counterclockwise SOFT

③Pre-Loadadjustment④spring
length[2][1]！ CAUTION：
Do not force to turn fromthe position that stops
lightly for the Soft side andHard side. It may causeinternal damage.
②Rebound Damping Adjuster
Use the right size tool for adjusting the 【3】Rebound Damping Adjuster on the Rear
Shock absorber（8 clicks /1 full turn）
clockwise
HARD
counterclockwise SOFT

② Rebounddamping adjuster①Low speed compression damping
adjuster
Use the right size tool for adjusting the 【２】High speed compression damping adjusteron the Rear Shock absorber（8 clicks/1 full turn）
clockwise
HARD
counterclockwise SOFT

[3]

③Pre-Load adjustment
Measure the Spring length while the Rear
wheel is off the ground. After loosening theBolt [4], turn the adjusting nut [5] toadjust the spring length.
Take care not to deform the rubber
adjuster. After adjusting, tighten the Bolt[4] with the specified torquetorque：5 N・ｍBolt[4]Adjusting nut[5]④Spring length・Standard237mm
・Adjustment range 230～237mm