Yamaha wr450f Manuel d'utilisateur télécharger pdf (Page 6)

500

450

400

350

300

250

200

150

100

Stroke mm

20 40 60 80 100 120

Oil level 100 mm Oil level 110 mm Oil level 120 mm Oil level 130 mm

In general, compression damping changes should

be used to influence the bike’s stability and re-

sponse, while rebound damping changes should

be used to influence comfort and traction.

When you need more damping force, you should

mainly try to increase compression damping and

use as little rebound damping as possible.

This usually means that you gain comfort and

performance in handling.

Oil level adjustment

As the air trapped between the oil and the top

nut acts as an air-spring, a change in oil level will

effect the damping forces. Not in the early stage

of fork travel, but a great deal in the later stage.

A general description of how the oil level/air-

spring effects the damping forces are shown in

Fig.4.

The air-spring gives the Öhlins USD fork a pro-

gressive spring rate, preventing it from bottoming

out hard.

By using different combinations of springs and oil

levels/air-springs you can alter the characteristic

of the fork and tailor it to suit different tracks and

conditions.

CAUTION!

The oil level must be the same in both front fork legs.

Riding a bike with different oil levels will cause

instability.

When the oil level is raised

The air-spring in the later half of travel is strong,

and thus the front fork hard.

When the oil level is lowered

The air-spring in the later half of travel is soft,

and thus the front fork soft.

CAUTION!

Adjust the oil level with the fork leg fully com-

pressed and no pre-load washer or spring installed.

NOTE!

See Mounting Instructions for recommended oil

level.

The oil level is measured from the top of the outer

leg, with the top nut off (Fig.6).

Changes in oil level should be made in small

steps. We recommend a change of 5 mm at a

time and not outside the range of 80-130 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

pre-load washer or

spring installed.

Oil level

Force

Stroke

Air spring

A change in oil level

will effect the damp-

ing forces, not in the

early stage of fork

travel but a great

deal in the later

stage.

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Yamaha wr450f Manuel d'utilisateur Page 6

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