2012 YAMAHA YFM250R torque

4-14
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)
U1BT62E0.book Page 14 Tuesday, April 19, 2011 7:06 PM

8-2
8
EBU29791Owner’s manual and tool kit Be sure to put this owner ’s manual in the manual
cover and always carry it along with the low-pres-
sure 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 cover1 2 3
4
43
U1BT62E0.book Page 2 Tuesday, April 19, 2011 7:06 PM

8-10
8
2. 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)
U1BT62E0.book Page 10 Tuesday, April 19, 2011 7:06 PM

8-13
86. 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 installingthe 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)
U1BT62E0.book Page 13 Tuesday, April 19, 2011 7:06 PM

8-19
84. 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
21
1. Gasket
2. Tailpipe
3. Tailpipe boltTightening torque:Tailpipe bolt:11 Nm (1.1 m ·kgf, 8.0 ft ·lbf)
1
2
3 3
U1BT62E0.book Page 19 Tuesday, April 19, 2011 7:06 PM

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. Adjusting nut
3. Locknut
2
3
1(a) (b)
Tightening torque:
Locknut (rear brake caliper):16 Nm (1.6 m ·kgf, 12 ft· lbf)
U1BT62E0.book Page 27 Tuesday, April 19, 2011 7:06 PM

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.
1. Rear wheel axle pinch bolt
2. Rod
3. Drive chain tensioner
4. Hole
2 11
3
4
Tightening torque:
Rear axle pinch bolt:21 Nm (2.1 m ·kgf, 15 ft ·lbf)
12 34
56 78
U1BT62E0.book Page 30 Tuesday, April 19, 2011 7:06 PM

8-43
83. Lower the ATV to the ground.
4. Tighten the wheel nuts to the specified
torques.
EBU25720Troubleshooting Although Yamaha ATVs receive a thorough in-
spection before shipment from the factory, trouble
may occur during operation. Any problem in the fu-
el, compression, or ignition systems, for example,
can cause poor starting and loss of power.
The following troubleshooting chart represents a
quick and easy procedure for checking these vital
systems yourself. However, should your ATV re-
quire any repair, take it to a Yamaha dealer, whose
skilled technicians have the necessary tools, expe-
rience, and know-how to service the ATV properly.
Use only genuine Yamaha replacement parts. Im-
itation parts may look like Yamaha parts, but they
are often inferior, have a shorter service life and
can lead to expensive repair bills.
WARNING
EWB02280Do not smoke when checking the fuel system.
Fuel can ignite or explode, causing severe inju-
ry or property damage. Make sure there are no
open flames or sparks in the area, including pi-
lot lights from water heaters or furnaces.
Tightening torques:Front wheel nut:45 Nm (4.5 m ·kgf, 33 ft· lbf)
Rear wheel nut: 45 Nm (4.5 m ·kgf, 33 ft· lbf)
U1BT62E0.book Page 43 Tuesday, April 19, 2011 7:06 PM