2012 YAMAHA YFM250R-W torque

4-16
4
TIP
A 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 1.0 mm
(0.04 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]
WARNING
EWB00450This shock absorber assembly contains highly
pressurized nitrogen gas. If the shock absorb-
er assembly is damaged, it could explode
causing injury or property damage. Shock ab-
sorber cylinder damage could also result in
poor handling which could cause an accident.
1. Locknut
2. Spring preload adjusting nut
3. Distance A
2
1
(b) 3(a)
Spring preload setting:
Minimum (soft):
Distance A = 234.0 mm (9.21 in)
Standard:
Distance A = 230.0 mm (9.06 in)
Maximum (hard):
Distance A = 222.0 mm (8.74 in)
Tightening torque:
Locknut:
42 Nm (4.2 m·kgf, 30 ft·lbf)
U33B71E0.book Page 16 Wednesday, August 10, 2011 9:01 AM

8-2
8
EBU29792Owner’s manual and tool kit Make sure to protect the owner’s manual by put-
ting it in the plastic bag, then by placing the bag in
the manual cover. Always carry the owner’s man-
ual along with the low-pressure tire gauge and the
owner’s tool kit under the seat.
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. Low-pressure tire gauge
2. Owner’s tool kit
3. Owner’s manual
4. Manual cover123
4
43
U33B71E0.book Page 2 Wednesday, August 10, 2011 9:01 AM

8-10
82. Check the spark plug for electrode erosion
and excessive carbon or other deposits, and
replace it if necessary.
3. Measure the spark plug gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.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 tighten it to the specified
torque.
TIPIf a torque wrench is not available when installing
the 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.3. Install the spark plug cap. Specified spark plug:
NGK/DR7EA
1. Spark plug gapSpark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Tightening torque:
Spark plug:
18 Nm (1.8 m·kgf, 13 ft·lbf)
U33B71E0.book Page 10 Wednesday, August 10, 2011 9:01 AM

8-13
8 6. Install a new oil filter element and new O-
rings.
TIPMake sure that the O-rings are properly seated.7. Install the oil filter element cover by installing
the bolts, and then tighten them to the speci-
fied torque.8. Install the engine oil drain bolt and its new
gasket, and then tighten the bolt to the speci-
fied torque.
9. Refill with the specified amount of the recom-
mended engine oil, and then install and tight-
en the engine oil filler cap.
TIPBe sure to wipe off spilled oil on any parts after the
engine and exhaust system have cooled down.
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
Tightening torque:
Engine oil drain bolt:
20 Nm (2.0 m·kgf, 14 ft·lbf)
Recommended oil:
See page 10-1.
Oil quantity:
Without oil filter element replacement:
1.25 L (1.32 US qt, 1.10 Imp.qt)
With oil filter element replacement:
1.35 L (1.43 US qt, 1.19 Imp.qt)
U33B71E0.book Page 13 Wednesday, August 10, 2011 9:01 AM

8-19
8 4. Check the gasket for damage, and replace it if
necessary.
5. Make sure the gasket is properly positioned,
then insert the tailpipe into the muffler and
align the bolt holes.6. Install the bolts and tighten them to the speci-
fied torque.
WARNING
EWB02340Do not start the engine when cleaning the
spark arrester, otherwise it could cause injury
to the eyes, burns, carbon monoxide poison-
1. Tailpipe
2. Spark arrester
2 1
1. Gasket
2. Tailpipe
3. Tailpipe boltTightening torque:
Tailpipe bolt:
11 Nm (1.1 m·kgf, 8.0 ft·lbf)
1 2
33
U33B71E0.book Page 19 Wednesday, August 10, 2011 9:01 AM

8-27
8
TIPIf the cable length cannot be adjusted to specifica-
tion, consult a Yamaha dealer.6. Tighten the locknut on the brake cable.
7. Slide the rubber cover to its original position.
8. Turn in the adjusting bolt at the rear brake cal-
iper until it feels tight, then turn it out 1/8 turn
and tighten its locknut to the specified torque.
NOTICE: When tightening the locknut,hold the adjusting bolt with a wrench so
that it does not turn together with the lock-
nut.
[ECB00521]
WARNING
EWB02090Operating with improperly serviced or adjust-
ed brakes could cause the brakes to malfunc-
tion, resulting in reduced braking
performance. This could increase the chance
of a collision or accident. After adjusting the
parking brake free play, block the rear of the
ATV off the ground and spin the rear wheels.
Check to make sure there is no brake drag. If
brake drag is noticed, perform the adjustment
again.EBU24743Brake light switches The brake light, which is activated by the brake
pedal and brake lever, should come on just before
braking takes effect.
1. Rubber cover
2. Parking brake free play adjusting nut
3. Locknut
2
3
1(a)(b)
Tightening torque:
Locknut (rear brake caliper):
16 Nm (1.6 m·kgf, 12 ft·lbf)
U33B71E0.book Page 27 Wednesday, August 10, 2011 9:01 AM

8-30
8
TIPA rod can be obtained at a Yamaha dealer to make
this adjustment.4. Shift the transmission into neutral.
5. To tighten the drive chain, push the ATV back-
ward. To loosen the drive chain, push the ATV
forward. NOTICE: Improper drive chain
slack will overload the engine as well as
other vital parts of the ATV and can lead to
drive chain slippage or breakage. To pre-vent this from occurring, keep the drive
chain slack within the specified limits.
[ECB00542]
6. Pull the rod out, and then tighten the rear axle
pinch bolts to the specified torque in the order
shown.
7. Check that the clearance between the speed
sensor and the speed sensor rotor is 3–5 mm
(0.12–0.19 in). If the clearance is out of spec-
ification, adjust the speed sensor position as
follows.
1. Rear wheel axle pinch bolt
2. Rod
3. Drive chain tensioner
4. Hole
4 3
2
11
Tightening torque:
Rear axle pinch bolt:
21 Nm (2.1 m·kgf, 15 ft·lbf)
12
5634
78
U33B71E0.book Page 30 Wednesday, August 10, 2011 9:01 AM

8-31
8
TIPThis specified clearance is necessary for the
speedometer to indicate an accurate reading.8. Loosen the speed sensor bracket bolt.
9. Adjust the position of the speed sensor so that
the clearance between the sensor and the
speed sensor rotor is 3–5 mm (0.12–0.19 in).
10. Tighten the bolt to the specified torque.
EBU24882Lubricating the drive chain The drive chain must be cleaned and lubricated at
the intervals specified in the periodic maintenance
and lubrication chart, otherwise it will quickly wear
out, especially when riding in dusty or wet areas.
Service the drive chain as follows.NOTICEECB00561The drive chain must be lubricated after wash-
ing the ATV or riding in the rain or wet areas.1. Clean the drive chain with kerosene and a
small soft brush. NOTICE: To prevent dam-
aging the O-rings, do not clean the drive
chain with steam cleaners, high-pressure
washers or inappropriate solvents.
[ECB00571]
1. Speed sensor rotor
2. Speed sensor
3. Speed sensor bracket bolt
4. Clearance
3 2
4
1
Tightening torque:
Speed sensor bracket bolt:
13 Nm (1.3 m·kgf, 9.4 ft·lbf)
U33B71E0.book Page 31 Wednesday, August 10, 2011 9:01 AM