March 4, 2024

 FRONT FORK SETTING

The front fork setting should be made depending on the rider’s feeling of an actual run and the circuit conditions.

The front fork setting includes the following three factors:

1.Setting of air spring characteristics

  • Change the fork oil amount.

2.Setting of spring preload

  • Change the spring.

3.Setting of damping force

  • Change the compression damping force.

  • Change the rebound damping force.

    The spring acts on the load and the damping force acts on the cushion travel speed.

CHANGE IN AMOUNT AND CHARACTERISTICS OF FORK OIL

Damping characteristic near the final stroke can be changed by changing the fork oil amount.

Adjust the oil amount in 5 cm³ (0.2 US oz, 0.2 Imp.oz) increments or decrements. Too small oil amount causes the front fork to produce a noise at full rebound or the rider to feel some pressure on his hands or body. Alternatively, too large oil amount will cause the air spring characteristics to have a tendency to be stiffer with the consequent deteriorated performance and characteristics. Therefore, adjust the front fork within the specified range.

  • Recommended oil

    Yamaha Suspension Oil S1

  • Standard oil amount

    295 cm³ (9.97 US oz, 10.4 Imp.oz)

  • Extent of adjustment

    260–365 cm³ (8.79–12.34 US oz, 9.17–12.87 Imp.oz)

A.

Air spring characteristics in relation to oil amount change

B.

Load

C.

Stroke

1.

Max. oil amount

2.

Standard oil amount

3.

Min. oil amount

SETTING OF SPRING AFTER REPLACEMENT

As the front fork setting can be easily affected by the rear suspension, take care so that the front and the rear are balanced (in position etc.) when setting the front fork.

1.Use of soft spring

  • Change the rebound damping force.

    Turn out one or two clicks.

  • Change the compression damping force.

    Turn in one or two clicks.

Generally a soft spring gives a soft riding feeling. Rebound damping tends to become stronger and the front fork may sink deeply over a series of gaps.

2.Use of stiff spring

  • Change the rebound damping force.

    Turn in one or two clicks.

  • Change the compression damping force.

    Turn out one or two clicks.

Generally a stiff spring gives a stiff riding feeling. Rebound damping tends to become weaker, resulting in lack of a sense of contact with the road surface or in a vibrating handlebar.

FRONT FORK SETTING PARTS

  • Front fork spring

STD Spring rate
N/mm

4.7

Type

Spring rate N/mm

Part number

I.D. mark (slits)

SOFT

4.5

BR9-23141-20

I-II

4.6

BR9-23141-30

I-III

 

4.7

BR9-23141-40

I-IIII

 

4.8

BR9-23141-50

I-IIIII

 

4.9

BR9-23141-60

II-II

5.0

BR9-23141-70

II-III

STIFF

5.1

BR9-23141-80

II-IIII

The I.D. mark (slits) is proved on the end of the spring.

REAR SUSPENSION SETTING

The rear shock absorber setting should be made depending on the rider’s feeling of an actual run and the circuit conditions.

The rear suspension setting includes the following two factors:

1.Setting of spring preload

  • Change the set length of the spring.

  • Change the spring.

2.Setting of damping force

  • Change the rebound damping force.

  • Change the compression damping force.

CHOOSING SET LENGTH

1.Place a stand or a block under the engine to put the rear wheel above the floor, and measure the length “a” between the rear wheel axle center and the rear fender holding bolt.

2.Remove the stand or block from the engine and, with a rider astride the seat, measure the sunken length “b” between the rear wheel axle center and the rear fender holding bolt.

3.Loosen the locknut “1” and make adjustment by turning the adjuster “2” to achieve the standard figure from the subtraction of the length “b” from the length “a”.

  • Standard figure

    90–100 mm (3.5–3.9 in)

  • If the machine is new and after it is broken in, the same set length of the spring may change because of the initial fatigue, etc. of the spring. Therefore, be sure to make reevaluation.

  • If the standard figure cannot be achieved by adjusting the adjuster and changing the set length, replace the spring with an optional one and make readjustment.

SETTING OF SPRING AFTER REPLACEMENT

After replacement, be sure to adjust the spring to the set length [sunken length 90–100 mm (3.5–3.9 in)] and set it.

1.Use of soft spring

  • Adjust to decrease rebound damping force to compensate for less spring load. Run with the rebound damping force adjuster one or two clicks turned out, and readjust it to suit your preference.

2.Use of stiff spring

  • Adjust to increase rebound damping force to compensate for greater spring load. Run with the rebound damping force adjuster one or two clicks turned in, and readjust it to suit your preference.

Adjusting the rebound damping force will be followed more or less by a change in the compression damping force. For correction, adjust to decrease compression damping force.

When using a rear shock absorber other than currently installed, use the one whose overall length “a” does not exceed the standard as it may result in faulty performance. Never use one whose overall length is greater than standard.

  • Length “a” of standard shock

    460.5 mm (18.1 in)

REAR SHOCK ABSORBER SETTING PARTS

  • Rear shock spring “1”

STD Spring rate
N/mm

56

Type

Spring rate N/mm

Part number

I.D. mark

SOFT

52

BR9-22212-00
(Blue)

Yellow

54

BR9-22212-10
(Blue)

Pink

 

56

BR9-22212-A0
(Silver)

White

BR9-22212-20*
(Blue)

White

58

BR9-22212-B0
(Silver)

Gold

BR9-22212-30*
(Blue)

Silver

STIFF

60

BR9-22212-40
(Blue)

Brown

* For BSB6

  • The I.D. mark “a” is marked at the end of the spring.

  • Spring specification varies according to the color of I.D. marks.

  • Spring preload adjusting positions

Spring preload adjusting positions

  • Minimum

    Position in which the spring is turned in 1.5 mm (0.06 in) from its free length.

  • Standard

    Position in which the spring is turned in 7.0 mm (0.28 in) from its free length.

  • Maximum

    Position in which the spring is turned in 18.0 mm (0.71 in) from its free length.

For the spring preload adjustment, refer to ADJUSTING THE REAR SHOCK ABSORBER ASSEMBLY.

SUSPENSION SETTING (FRONT FORK)

  • If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to the adjustment procedure given in the same chart.

  • Before any change, set the rear shock absorber sunken length to the standard figure 90–100 mm (3.5–3.9 in).

Symptom

Section

Check

Adjust

Jump

Large gap

Medium gap

Small gap

Stiff over entire range

 

Compression damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Oil amount

Decrease oil amount by about 5–10 cm³ (0.2–0.3 US oz, 0.2–0.4 Imp.oz).

Spring

Replace with soft spring.

Unsmooth movement over entire range

Outer tube

Inner tube

Check for any bends, dents, other noticeable scars, etc. If any, replace affected parts.

Slide metal

Replace with a new one for extended use.

Piston metal

Replace with a new one for extended use.

Lower bracket tightening torque

Retighten to specified torque.

Poor initial movement

 

 

 

Rebound damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Oil seals

Apply grease in oil seal wall.

Soft over entire range, bottoming out

 

 

Compression damping force

Turn adjuster clockwise (about 2 clicks) to increase damping.

Oil amount

Increase oil amount by about 5–10 cm³ (0.2–0.3 US oz, 0.2–0.4 Imp.oz).

Spring

Replace with stiff spring.

Stiff toward stroke end

 

 

 

Oil amount

Decrease oil amount by about 5 cm³ (0.2 US oz, 0.2 Imp.oz).

Soft toward stroke end, bottoming out

 

 

 

Oil amount

Increase oil amount by about 5 cm³ (0.2 US oz, 0.2 Imp.oz).

Stiff initial movement

Compression damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Low front, tending to lower front posture

Compression damping force

Turn adjuster clockwise (about 2 clicks) to increase damping.

Rebound damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Balance with rear end

Set sunken length for 95–100 mm (3.7–3.9 in) when one passenger is astride seat (lower rear posture).

Oil amount

Increase oil amount by about 5 cm³ (0.2 US oz, 0.2 Imp.oz).

“Obtrusive” front, tending to upper front posture

Compression damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Balance with rear end

Set sunken length for 90–95 mm (3.5–3.7 in) when one passenger is astride seat (upper rear posture).

Spring

Replace with soft spring.

Oil amount

Decrease oil amount by about 5–10 cm³ (0.2–0.3 US oz, 0.2–0.4 Imp.oz).

SUSPENSION SETTING (REAR SHOCK ABSORBER)

  • If any of the following symptoms is experienced with the standard position as the base, make resetting by reference to the adjustment procedure given in the same chart.

  • Adjust the rebound damping in 2-click increments or decrements.

  • Adjust the low compression damping in 1-click increments or decrements.

  • Adjust the high compression damping in 1/6 turn increments or decrements.

Symptom

Section

Check

Adjust

Jump

Large gap

Medium gap

Small gap

Stiff, tending to sink

 

 

Rebound damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Spring set length

Set sunken length for 90–100 mm (3.5–3.9 in) when one passenger is astride seat.

Spongy and unstable

 

 

Rebound damping force

Turn adjuster clockwise (about 2 clicks) to increase damping.

Low compression damping

Turn adjuster clockwise (about 1 click) to increase damping.

Spring

Replace with stiff spring.

Heavy and dragging

 

 

Rebound damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Spring

Replace with soft spring.

Poor road gripping

 

 

 

Rebound damping force

Turn adjuster counterclockwise (about 2 clicks) to decrease damping.

Low compression damping

Turn adjuster clockwise (about 1 click) to increase damping.

High compression damping

Turn adjuster clockwise (about 1/6 turn) to increase damping.

Spring set length

Set sunken length for 90–100 mm (3.5–3.9 in) when one passenger is astride seat.

Spring

Replace with soft spring.

Bottoming out

 

 

High compression damping

Turn adjuster clockwise (about 1/6 turn) to increase damping.

Spring set length

Set sunken length for 90–100 mm (3.5–3.9 in) when one passenger is astride seat.

Spring

Replace with stiff spring.

Bouncing

 

 

Rebound damping force

Turn adjuster clockwise (about 2 clicks) to increase damping.

Spring

Replace with soft spring.

Stiff travel

 

 

High compression damping

Turn adjuster counterclockwise (about 1/6 turn) to decrease damping.

Spring set length

Set sunken length for 90–100 mm (3.5–3.9 in) when one passenger is astride seat.

Spring

Replace with soft spring.

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