2011 YAMAHA YZ85 torque
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INSTRUMENT AND CONTROL FUNCTIONS
4-10
4
A special wrench can be ob-
tained at a Yamaha dealer to
make this adjustment.
The spring preload setting is
determined by measuring dis-
tance A, shown in the illustra-
tion. The longer distance A is,
the lower the spring preload;
the shorter distance A is, the
higher the spring preload.
With each complete turn of
the adjusting nut, distance A
is changed by 1.5 mm (0.06
in).3. Tighten the locknut to the specified
torque. NOTICE: Always tighten
the locknut against the adjust-
ing nut, and then tighten the
locknut to the specified torque.
[ECA10121]
Rebound damping force
To increase the rebound damping force
and thereby harden the rebound damp-
ing, turn the adjusting screw in direction
(a). To decrease the rebound damping
force and thereby soften the rebound
damping, turn the adjusting screw in di-
rection (b).
1. Locknut
2. Spring preload adjusting nut
1. Distance A
Spring preload:
Minimum (soft):
Distance A = 218.5 mm (8.60 in)
Standard:YZ85(A)
Distance A = 215.0 mm (8.46 in)
For Europe only: Distance A =
212.0 mm (8.35 in)
Standard:YZ85LW(A)
Distance A = 207.0 mm (8.15 in)
For Europe only: Distance A =
212.0 mm (8.35 in)
Maximum (hard):
Distance A = 202.5 mm (7.97 in)
Tightening torque:
Locknut:
35 Nm (3.5 m·kgf, 25 ft·lbf)
1. Rebound damping force adjusting screw
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Page 53 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-9
7 To install the spark plug
1. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
2. Install the spark plug with the
spark plug wrench, and then tight-
en it to the specified torque.
TIPIf a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4–1/2 turn
past finger tight. However, the spark
plug should be tightened to the speci-
fied torque as soon as possible.3. Install the spark plug cap.
EAU41448
Transmission oil The transmission must be checked for
oil leakage before each ride. If any
leakage is found, have a Yamaha deal-
er check and repair the motorcycle. In
addition, the transmission oil must be
changed at the intervals specified in the
periodic maintenance and lubrication
chart.
1. Start the engine, warm it up for
several minutes, and then turn it
off.
2. Place the motorcycle on a level
surface and hold it in an upright po-
sition.
3. Place an oil pan under the trans-
mission case to collect the used
oil.
4. Remove the oil filler cap, the trans-
mission oil drain bolt and its gasket
to drain the oil from the transmis-
sion.5. Install the drain bolt and its new
gasket, and then tighten the bolt to
the specified torque.
6. Refill with the specified amount of
the recommended transmission
oil, and then install and tighten the
oil filler cap.
Tightening torque:
Spark plug:
20 Nm (2.0 m·kgf, 14 ft·lbf)
1. Transmission oil filler cap
2. Transmission oil drain bolt
3. Gasket
Tightening torque:
Transmission oil drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Recommended transmission oil:
See page 9-1.
Oil change quantity:
0.50 L (0.53 US qt, 0.44 Imp.qt)
21
2
3
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Page 55 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-11
7 is not available, use distilled wa-
ter or soft tap water instead. Do
not use hard water or salt water
since it is harmful to the engine.
If water has been used instead
of coolant, replace it with cool-
ant as soon as possible, other-
wise the cooling system will not
be protected against frost and
corrosion. If water has been
added to the coolant, have a
Yamaha dealer check the anti-
freeze content of the coolant as
soon as possible, otherwise the
effectiveness of the coolant will
be reduced.
[ECA10472]
EAUM1315
To change the coolant
1. Place the vehicle on a level sur-
face and let the engine cool if nec-
essary.
2. Place a container under the engine
to collect the used coolant.
3. Remove the coolant drain bolt and
its gasket, and then the radiator
cap to drain the cooling system.WARNING! Never attempt to re-
move the radiator cap when the
engine is hot.
[EWA10381]
4. After the coolant is completely
drained, thoroughly flush the cool-
ing system with clean tap water.5. Install the coolant drain bolt and its
new gasket, and then tighten the
bolt to the specified torque.
6. Pour the recommended coolant
into the radiator until it is full.
7. Install the radiator cap, start the
engine, let it idle for several min-
utes, and then turn it off.
8. Remove the radiator cap to check
the coolant level in the radiator. If
necessary, add sufficient coolant
until it reaches the bottom of the
radiator filler neck, and then install
the radiator cap.1. Coolant drain bolt
2. Gasket
1. Radiator cap
1
1
2
Tightening torque:
Coolant drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Antifreeze/water mixture ratio:
1:1
Recommended antifreeze:
High-quality ethylene glycol anti-
freeze containing corrosion inhibi-
tors for aluminum engines
Coolant quantity:
Radiator capacity (including all
routes):
0.54 L (0.57 US qt, 0.48 Imp.qt)
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Page 66 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-22
74. If the drive chain slack is incorrect,
adjust it as follows.
EAU41482
To adjust the drive chain slack
1. Loosen the axle nut and the lock-
nut on each side of the swingarm.
2. To tighten the drive chain, turn the
drive chain slack adjusting bolt on
each side of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting bolt on each side
of the swingarm in direction (b),
and then push the rear wheel for-
ward. NOTICE: Improper drive
chain slack will overload the en-
gine as well as other vital parts
of the motorcycle and can leadto chain slippage or breakage.
To prevent this from occurring,
keep the drive chain slack with-
in the specified limits.
[ECA10571]
TIPUsing the alignment marks on each
drive chain puller, make sure that both
drive chain pullers are in the same po-
sition for proper wheel alignment.3. Tighten both locknuts and the axle
nut to the specified torques.
1. Drive chain slack
1. Axle nut
2. Drive chain puller
3. Locknut
4. Drive chain slack adjusting bolt
5. Alignment marks
54 3 2
Tightening torques:
Locknut:
16 Nm (1.6 m·kgf, 12 ft·lbf)
Axle nut:
90 Nm (9.0 m·kgf, 65 ft·lbf)
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Page 72 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-28
74. Pull the wheel axle out, and then
remove the wheel. NOTICE: Do
not apply the brake after the
wheel has been removed to-
gether with the brake disc, oth-
erwise the brake pads will be
forced shut.
[ECA11071]
EAU41422
To install the front wheel
1. Lift the wheel up between the fork
legs.TIPMake sure that there is enough space
between the brake pads before install-
ing the wheel.2. Insert the wheel axle from the right
side.3. Lower the front wheel so that it is
on the ground, install the remov-
able sidestand, and then rest the
motorcycle on it.
4. Install the washer and axle nut,
and then tighten the axle nut to the
specified torque.
EAU25080
Rear wheel
EAU41313
To remove the rear wheel
WARNING
EWA10821
To avoid injury, securely support the
vehicle so there is no danger of it
falling over.1. Loosen the axle nut.
2. Lift the rear wheel off the ground
according to the procedure on
page 7-27.
3. Fully loosen the locknut, and then
loosen the drive chain slack ad-
justing bolt on each side of the
swingarm.
4. Remove the axle nut and washer.
1. Wheel axle
Tightening torque:
Axle nut:
70 Nm (7.0 m·kgf, 51 ft·lbf)
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Page 74 of 86
PERIODIC MAINTENANCE AND ADJUSTMENT
7-30
75. Adjust the drive chain slack. (See
page 7-21.)
6. Tighten the locknuts and the axle
nut to their specified torques.
EAU25871
Troubleshooting Although Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur dur-
ing operation. Any problem in the fuel,
compression, or ignition systems, for
example, can cause poor starting and
loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look like
Yamaha parts, but they are often inferi-
or, have a shorter service life and can
lead to expensive repair bills.
WARNING
EWA15141
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the ar-
ea, including pilot lights from waterheaters or furnaces. Gasoline or
gasoline vapors can ignite or ex-
plode, causing severe injury or
property damage.
Tightening torque:
Locknut:
16 Nm (1.6 m·kgf, 12 ft·lbf)
Axle nut:
90 Nm (9.0 m·kgf, 65 ft·lbf)
U5PA89E0.book Page 30 Tuesday, June 15, 2010 10:34 AM