Page 40 of 150
4-15
4
TIPA special wrench can be obtained at a Yamaha
dealer to make this adjustment.The spring preload setting is determined by
measuring distance A, shown in the illustration.
The shorter distance A is, the higher the spring
preload; the longer distance A is, the lower 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 adjusting nut, and then tighten
it to the specified torque.
[ECB00081]
1. Spring preload adjusting nut
2. Locknut
3. Special wrench
2
1
3 (a)
(b)
Spring preload setting:
Minimum (soft):
Distance A = 263.0 mm (10.35 in)
Standard:
Distance A = 260.0 mm (10.24 in)
Maximum (hard):
Distance A = 251.0 mm (9.88 in)1. Distance A
1
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Page 41 of 150

4-16
4 Rebound damping force
Turn the rebound damping force adjusting screw in
direction (a) to increase the rebound damping
force and thereby harden the damping, and in di-
rection (b) to decrease the rebound damping force
and thereby soften the damping.
TIPMake sure that the position indicator marks are
aligned when the shock absorber assembly is set
to the standard setting.Compression damping force
Compression damping force (for fast compressiondamping)To increase the compression damping force and
thereby harden the compression damping, turn the
compression damping force adjusting bolt in direc-
tion (a). To decrease the compression damping
force and thereby soften the compression damp-
ing, turn the adjusting bolt in direction (b). Tightening torque:
Locknut:
42 Nm (4.2 m·kgf, 30 ft·lbf)
1. Rebound damping force adjusting screw
2. Position indicator marks
1(a)
(b)
2
Rebound damping setting:
Minimum (soft):
20 click(s) in direction (b)*
Standard:
12 click(s) in direction (b)*
Maximum (hard):
3 click(s) in direction (b)*
* With the adjusting screw fully turned in direc-
tion (a)
U1AS60E0.book Page 16 Friday, February 6, 2009 1:27 PM
Page 45 of 150
4-20
4
TIPA special wrench can be obtained at a Yamaha
dealer to make this adjustment.The spring preload setting is determined by
measuring distance A, shown in the illustration.
The shorter distance A is, the higher the spring
preload; the longer distance A is, the lower 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 adjusting nut, and then tighten
it to the specified torque.
[ECB00081]
Spring preload setting:
Minimum (soft):
Distance A = 243.0 mm (9.57 in)
Standard:
Distance A = 233.0 mm (9.17 in)
Maximum (hard):
Distance A = 228.0 mm (8.98 in)
1. Distance ATightening torque:
Locknut:
42 Nm (4.2 m·kgf, 30 ft·lbf)
1
U1AS60E0.book Page 20 Friday, February 6, 2009 1:27 PM
Page 87 of 150
8-2
8 The service information included in this manual
and the tools provided in the owner’s tool kit are in-
tended to assist you in the performance of preven-
tive maintenance and minor repairs. However,
additional tools such as a torque wrench may be
necessary to perform certain maintenance work
correctly.
TIPIf you do not have the tools or experience required
for a particular job, have a Yamaha dealer perform
it for you.1. Owner’s manual
2. Owner’s tool kit
3. Low-pressure tire gauge
1
21
2
3
U1AS60E0.book Page 2 Friday, February 6, 2009 1:27 PM
Page 96 of 150
8-11
82. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
To install the spark plug
1. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
2. Clean the surface of the spark plug gasket
and its mating surface, and then wipe off any
grime from the spark plug threads.
3. Install the spark plug with the spark plug
wrench, and then tighten it to the specified
torque. Specified spark plug:
NGK/CR8E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)
1. Spark plug gapTightening torque:
Spark plug:
12.5 Nm (1.25 m·kgf, 9.0 ft·lbf)
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Page 97 of 150

8-12
8
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 specified torque as
soon as possible.4. Install the spark plug cap.EBU26785Engine oil and oil filter element The engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter element replaced at the intervals spec-
ified in the periodic maintenance and lubrication
chart.
To check the engine oil level
1. Place the ATV on a level surface.
2. Start the engine, warm it up until the engine oil
has reached a normal temperature of 60 °C
(140 °F), let it continue to idle for ten seconds
or more, and then turn the engine off.
TIPTo achieve the proper engine oil temperature for
an accurate oil level reading, the engine must have
first completely cooled down, and then warmed up
again for several minutes to normal operating tem-
perature.3. Remove the engine oil tank filler cap, and then
wipe the engine oil dipstick off with a clean
rag.
4. Insert the dipstick in the filler hole (without
screwing it in), and then remove it again to
check the oil level.
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Page 100 of 150
8-15
88. Check the O-rings for damage, and replace
them if necessary.9. Install a new oil filter element and the O-rings.
TIPMake sure that the O-rings are properly seated.10. Install the oil filter element cover by installing
the bolts, and then tighten them to the speci-
fied torque.
1. Oil filter element cover
2. Bolt
21
1. Oil filter element
2. O-ringTightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
1
2
2
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Page 101 of 150

8-16
8 11. Install the crankcase engine oil drain bolt and
the engine oil tank drain bolt, and then tighten
them to the specified torques.
12. Install the crankcase engine oil filler cap, and
then tighten it to the specified torque.
13. Pour only 1.3 L (1.37 US qt, 1.14 Imp.qt) of
the specified amount of the recommended en-
gine oil through the engine oil tank filler hole,
and then install and tighten the oil tank filler
cap.
14. Start the engine, rev it several times, and then
turn it off.15. Remove the engine oil tank filler cap, and then
gradually fill the oil tank with the remaining oil
quantity while regularly checking the oil level
on the dipstick.
16. Install and tighten the engine oil tank filler cap.
TIPBe sure to wipe off spilled oil on any parts after the
engine and exhaust system have cooled down.NOTICEECB00300In order to prevent clutch slippage (since the
engine oil also lubricates the clutch), do not
mix any chemical additives. Do not use oils
with a diesel specification of “CD” or oils of Tightening torques:
Crankcase engine oil drain bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
Engine oil tank drain bolt:
19 Nm (1.9 m·kgf, 13 ft·lbf)
Tightening torque:
Crankcase engine oil filler cap:
12 Nm (1.2 m·kgf, 8.7 ft·lbf)Recommended oil:
See page 10-1.
Oil quantity:
Without oil filter element replacement:
1.75 L (1.85 US qt, 1.54 Imp.qt)
With oil filter element replacement:
1.85 L (1.96 US qt, 1.63 Imp.qt)
U1AS60E0.book Page 16 Friday, February 6, 2009 1:27 PM