2013 YAMAHA YFZ450 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 1.5 mm
(0.06 in).
7. 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
(a)
(b)3
Spring preload setting:
Minimum (soft):Distance A = 264.0 mm (10.39 in)
Standard: Distance A = 257.0 mm (10.12 in)
Maximum (hard): Distance A = 250.0 mm (9.84 in)1. Distance A
1
U1PD61E0.book Page 16 Tuesday, February 14, 2012 10:06 AM

4-17
48. Place the air filter case in the original position,
connect the air intake duct, and then tighten
the clamp screw at the carburetor side.
NOTICE: Make sure that the air intake duct
is properly connected to the carburetor,
and that the clamp screw is tightened se-
curely.
[ECB01170]
9. Install the bolts, install the hose joint, and then connect the hoses.
10. Install the seat.
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.●Do not tamper with or attempt to open the
cylinder assembly.●Do not subject the shock absorber assembly
to an open flame or other high heat.
●Do not deform or damage the cylinder in any
way.●Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-
er for any service.
Tightening torque: Locknut:44 Nm (4.4 m·kgf, 32 ft·lbf)
U1PD61E0.book Page 17 Tuesday, February 14, 2012 10:06 AM

8-2
8
EBU27111Owner’s manual and tool kit Be sure to put this owner’s manual in the plastic
bag and to always carry it as well as the owner’s
tool kit and the low-pressure tire gauge in their re-
spective compartments 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
3
2
1
U1PD61E0.book Page 2 Tuesday, February 14, 2012 10:06 AM

8-14
8To 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.
4. Place the fuel tank in the original position, andthen install the bolt.
5. Remove the fuel tank cap by turning it coun- terclockwise.
6. Place the panel in the original position. 7. Install the fuel tank cap by turning it clockwise.
8. Install the bolts and the quick fastener screws.
9. Install the seat.
EBU23308Engine 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.
Tightening torque:
Spark plug:13 Nm (1.3 m·kgf, 9.4 ft·lbf)1. Projection
2. Slot
21
U1PD61E0.book Page 14 Tuesday, February 14, 2012 10:06 AM

8-18
88. Remove the oil filter element and the O-rings. 9. Install a new oil filter element and new 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.
11. Install the crankcase engine oil drain bolt, the engine oil tank drain bolt and their new gasket,
and then tighten the bolts to the specified
torques.
1. Oil filter element cover
2. Bolt
1. Oil filter element
2. O-ring
1
21
2
2
Tightening torque:
Oil filter element cover bolt:10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Tightening torques: Crankcase engine oil drain bolt:20 Nm (2.0 m·kgf, 14 ft·lbf)
Engine oil tank drain bolt: 19 Nm (1.9 m·kgf, 14 ft·lbf)
U1PD61E0.book Page 18 Tuesday, February 14, 2012 10:06 AM

8-20
816. Install the engine guard by installing the bolts,
and then tighten them to the specified torque.
NOTICE: Be sure to apply LOCTITE
® to the
engine guard bolts before installing them.
[ECB00371]
EBU23470
Coolant The coolant level should be checked before each
ride. In addition, the coolant must be changed at
the intervals specified in the periodic maintenance
and lubrication chart.EBU27942To check the coolant level 1. Place the ATV on a level surface.TIPThe coolant level must be checked on a cold en-
gine since the level varies with engine tempera-
ture.2. Check the coolant level in the coolant reser- voir.
TIPThe coolant should be between the minimum and
maximum level marks.3. If the coolant is at or below the minimum levelmark, remove the coolant reservoir cap, add
coolant or distilled water to the maximum level
mark, and then install the reservoir cap.
NOTICE: If coolant is not available, use
distilled water or soft tap water instead. Do
not use hard water or salt water since they
Tightening torque:
Engine guard bolt:7 Nm (0.7 m·kgf, 5.1 ft·lbf)1. Maximum level mark
2. Minimum level mark
3. Coolant reservoir
4. Coolant reservoir cap
1
2 4
3
U1PD61E0.book Page 20 Tuesday, February 14, 2012 10:06 AM

8-23
8
7. After draining the coolant, thoroughly flush the
cooling system with clean tap water.
8. Install the coolant reservoir by installing the bolts.
9. Install the coolant drain bolt and its new gas- ket, and then tighten the bolt to the specified
torque. 10. Pour the recommended coolant into the reser-
voir to the maximum level mark, and then in-
stall the reservoir cap. NOTICE: Mix
antifreeze with distilled water only. Howev-
er, if distilled water is not available, soft
water may be used for refilling. Do not use
hard water or salt water since they are
harmful to the engine.
[ECB00991]
11. Pour the recommended coolant into the radia- tor until it is full.
12. Install the radiator cap, start the engine, let it idle for several minutes, and then turn it off.
1. Coolant reservoir cap
2. Coolant reservoir
3. BoltTightening torque:Coolant drain bolt:10 Nm (1.0 m·kgf, 7.2 ft·lbf)
1
3
2
Antifreeze/water mixture ratio:1:1
Recommended antifreeze: High-quality ethylene glycol antifreeze con-
taining corrosion inhibitors for aluminum en-
gines
Coolant quantity: Radiator capacity (including all routes):1.30 L (1.37 US qt, 1.14 Imp.qt)
Coolant reservoir capacity (up to the maxi-
mum level mark): 0.29 L (0.31 US qt, 0.26 Imp.qt)
U1PD61E0.book Page 23 Tuesday, February 14, 2012 10:06 AM

8-29
8
4. Insert the tailpipe into the muffler and align the
bolt holes.
5. Install the bolt and tighten it to the specified torque.
6. Remove the purging bolt and the gasket. 7. Start the engine and rev it up approximately
twenty times while momentarily creating ex-
haust system back pressure by blocking the
end of the muffler with a shop towel.
8. Stop the engine and allow the exhaust pipe to cool.
9. Check the gasket for damage, and replace it if necessary.
10. Install the gasket and the purging bolt, and then tighten the bolt to the specified torque.
1. Tailpipe
2. Spark arresterTightening torque:Tailpipe bolt:10 Nm (1.0 m·kgf, 7.2 ft·lbf)
1
2
1. Purging bolt
2. Gasket
1
2
U1PD61E0.book Page 29 Tuesday, February 14, 2012 10:06 AM