2002 YAMAHA YZ85 torque

3 - 33
INSP
ADJ
STEERING HEAD INSPECTION AND ADJUSTMENT
lTighten the steering ring nut 3 using
steering nut wrench 4.
NOTE:
Set the torque wrench to the steering nut
wrench so that they form a right angle.
Steering nut wrench:
YU-33975/90890-01403
T R..
Steering ring nut (initial tighten-
ing):
38 Nm (3.8 m • kg, 27 ft • lb)
lLoosen the steering ring nut one turn.
lRetighten the steering ring nut using the
steering nut wrench.
WARNING
Avoid over-tightening.
T R..
Steering ring nut (final tighten-
ing):
4 Nm (0.4 m • kg, 2.9 ft • lb)
lCheck the steering stem by turning it lock
to lock. If there is any binding, remove the
steering stem assembly and inspect the
steering bearings.
lInstall the upper bracket 5, steering stem
nut 6, handlebar 7, handlebar upper
holder 8 and number plate 9.
NOTE:
lThe upper handlebar holder should be
installed with the punched mark a for-
ward.
lInsert the end of fuel breather hose 0 into
the hole of the steering stem.
CAUTION:
First tighten the bolts on the front side of
the handlebar holder, and then tighten
the bolts on the rear side.
T R..
Steering stem nut:
115 Nm (11.5 m • kg, 85 ft • lb)
Handlebar upper holder:
27 Nm (2.7 m • kg, 19 ft • lb)
Pinch bolt (upper bracket):
22 Nm (2.2 m • kg, 16 ft • lb)
Number plate:
7 Nm (0.7 m • kg, 5.1 ft • lb)
5PA30750
5PA30760

5 - 38
CHAS
25. Loosen:
lRebound damping adjuster 1
NOTE:
lLoosen the rebound damping adjuster finger
tight.
lRecord the set position of the adjuster (the
amount of turning out the fully turned in posi-
tion).
5PA51170
26. Install:
lFront fork cap bolt 1
Fully tighten the front fork cap bolt onto the
damper rod by hand.
NOTE:
Make sure that there is a clearance a of Zero
~ 1 mm (Zero ~ 0.04 in) between the front fork
cap bolt and locknut 2.
5PA51180
27. Tighten:
lFront fork cap bolt (locknut) 1
NOTE:
Hold the locknut 2 and tighten the front fork
cap bolt with specified torque.
5PA51190
T R..15 Nm (1.5 m · kg, 11 ft · lb)
28. Install:
lFront fork cap bolt 1
To outer tube.
NOTE:
Temporarily tighten the cap bolt.
5PA51200
29. Install:
lProtector guide 1
5PA51210
FRONT FORK

5 - 39
CHAS
Front fork installation
1. Install:
lFront fork 1
NOTE:
lTemporarily tighten the pinch bolts (lower
bracket).
lDo not tighten the pinch bolts (upper bracket)
yet.
5PA51220
2. Tighten:
lFront fork cap bolt 1
3. Adjust:
lFront fork top end a
Front fork top end (standard) a:
YZ85: 24 mm (0.94 in)
YZ85LW: Zero mm (Zero in)
T R..28 Nm (2.8 m · kg, 20 ft · lb)
5PA51230
4. Tighten:
lPinch bolt (upper bracket) 1
lPinch bolt (lower bracket) 2
CAUTION:
Tighten the lower bracket to specified
torque. If torqued too much, it may cause
the front fork to malfunction.5PA51240
T R..22 Nm (2.2 m · kg, 16 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
5. Install:
lProtector 1
lBolt (protector) 2
NOTE:
Fit the brake hose into the guides a of the pro-
tector.
5PA51260
T R..7 Nm (0.7 m · kg, 5.1 ft · lb)
FRONT FORK

5 - 50
CHAS
9. After tightening the nut, check the steering
for smooth movement. If not, adjust the
steering by loosening the steering ring nut
little by little.
10. Adjust:
lFront fork top end a
Front fork top end (standard) a:
YZ85: 24 mm (0.94 in)
YZ85LW: Zero mm (Zero in)
5PA51600
11. Tighten:
lPinch bolt (upper bracket) 1
lPinch bolt (lower bracket) 2
CAUTION:
Tighten the lower bracket to specified
torque. If torqued too much, it may cause
the front fork to malfunction.5PA51610
T R..22 Nm (2.2 m · kg, 16 ft · lb)
T R..20 Nm (2.0 m · kg, 14 ft · lb)
STEERING

7 - 18
TUNSETTING
Suspension setting
lFront fork
NOTE:
lIf 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.
lBefore any change, set the rear shock absorber sunken length to the standard figure 75 ~ 85 mm
(3.0 ~ 3.3 in).
SymptomSection
Check Adjust
JumpLarge
gapMedium
gapSmall
gap
Stiff over entire range
{{{Compression damping
Oil level (oil amount)
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with soft spring.
Unsmooth movement
over entire range{{{{Outer tube
Inner tube
Under bracket tightening
torqueCheck for any bends, dents, and other noticeable
scars, etc. If any, replace affected parts.
Retighten to specified torque.
Poor initial
movement{Rebound damping
Oil sealTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Apply grease in oil seal wall.
Soft over entire range,
bottoming out{{Compression damping
Oil level (oil amount)
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Increase oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).
Replace with stiff spring.
Stiff toward stroke end{Oil level (oil amount) Decrease oil level by about 5 mm (0.2 in).
Soft toward stroke end,
bottoming out{Oil level (oil amount) Increase oil level by about 5 mm (0.2 in).
Stiff initial movement{{{{Compression dampingTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Low front, tending to
lower front posture{{Compression damping
Rebound damping
Balance with rear end
Oil level (oil amount)Turn adjuster clockwise (about 2 clicks) to increase
damping.
Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 80 ~ 85 mm (3.1 ~ 3.3 in) when
one passenger is astride seat (lower rear posture).
Increase oil level by about 5 mm (0.2 in).
“Obtrusive” front, tend-
ing to upper front pos-
ture{{Compression damping
Balance with rear end
Spring
Oil level (oil amount)Turn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Set sunken length for 75 ~ 80 mm (3.0 ~ 3.1 in) when
one passenger is astride seat (upper rear posture).
Replace with soft spring.
Decrease oil level by about 5 ~ 10 mm (0.2 ~ 0.4 in).