2004 YAMAHA YZ85 set clock

3 - 37
INSP
ADJ
IGNITION TIMING CHECK
IGNITION TIMING CHECK
1. Remove:

Air scoop

Spark plug

Left crankcase cover
2. Attach:

Dial gauge 1

Dial gauge stand 2
Dial gauge and stand:
YU-3097/90890-01252
Stand:
YU-12565PA30870
3. Rotate the rotor 1 until the piston reaches
top dead center (TDC). When this hap-
pens, the needle on the dial gauge will stop
and reverse directions even though the
rotor is being turned in the same direction.
4. Set the dial gauge to zero at TDC.
5PA30880
5. From TDC, rotate the rotor clockwise until
the dial gauge indicates that the piston is at
a specified distance from TDC.
Ignition timing (B.T.D.C.):
0.9 mm (0.035 in)
6. Check:

Ignition timing
Punch mark a on rotor should be aligned
with punch mark b on stator.
Not aligned → Adjust.
5PA30890

7 - 18
TUNSETTING
Suspension setting

Front fork
NOTE:

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 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).

7 - 19
TUNSETTING

Rear shock absorber
NOTE:

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 damping in 2-click increments or decrements.
SymptomSection
Check Adjust
JumpLarge
gapMedium
gapSmall
gap
Stiff, tending to sink
{{Rebound damping
Spring set lengthTurn 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.
Spongy and unstable{{Rebound damping
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Replace with stiff spring.
Heavy and dragging{{Rebound damping
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Replace with soft spring.
Poor road gripping{Rebound damping
Compression damping
Spring set length
SpringTurn adjuster counterclockwise (about 2 clicks) to
decrease damping.
Turn adjuster clockwise (about 2 clicks) to increase
damping.
Set sunken length for 75 ~ 80 mm (3.0 ~ 3.1 in)
when one passenger is astride seat.
Replace with soft spring.
Bottoming out{{Compression damping
Spring set length
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Set sunken length for 75 ~ 80 mm (3.0 ~ 3.1 in)
when one passenger in astride seat.
Replace with stiff spring.
Bouncing{{Rebound damping
SpringTurn adjuster clockwise (about 2 clicks) to increase
damping.
Replace with soft spring.
Stiff travel{{Compression damping
Spring set length
SpringTurn 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.
Replace with soft spring.