2002 YAMAHA YFM660R torque

4-39 1. Adjusting nut 2. Locknut 3. Special wrench
1.Écrou de réglage 2. Contre-écrou 3. Clé spéciale
1. Anillo de ajuste 2. Contratuerca 3. Llave especial
A. Spring length
A. Longueur du ressort
A. Longitud del muelle
Adjust the spring preload as follows.
1. Loosen the locknut.
2. Turn the adjusting nut in direction
a to in-
crease the spring preload and in direction
b
to decrease the spring preload.
3. The length of the spring (installed) changes
1.5 mm per turn of the adjusting nut.NOTE:_ A special wrench can be obtained at a Yamaha
dealer. _4. Tighten the locknut to the specified torque.CAUTION:_ Always tighten the locknut against the adjust-
ing nut, then tighten it to the specified torque. _
Measurement A:
Installed length:
Minimum (hard): 232 mm
Standard: 240 mm
Maximum (soft): 247 mm
Tightening torque:
42 Nm (4.2 m·kgf)
U5LP61.book Page 39 Monday, August 27, 2001 3:49 PM

5-21
EBU00151
Throttle lever
Check to see that the throttle lever operates cor-
rectly. It must open smoothly and spring back to
idle position when released. Repair as necessary
for proper operation.
EBU00152
Fittings and Fasteners
Always check the tightness of chassis fittings and
fasteners before a ride. Take the machine to a
Yamaha dealer or refer to the Service Manual for
correct tightening torque.
EBU00991
Lights
Check the headlights and tail/brake light to make
sure they are in working condition. Repair as nec-
essary for proper operation.
EBU00912
Switches
Check the operation of the light switch, engine
stop switch and any other switches. Repair as nec-
essary for proper operation.
U5LP61.book Page 21 Monday, August 27, 2001 3:49 PM

8-3 1. Owner’s manual
2. Owner’s tool kit
3. Low-pressure tire gauge
1. Manuel du propriétaire
2. Trousse à outils
3. Manomètre basse pression pour pneus
1. Manual del usuario
2. Equipo de herramientas
3. Comprobador de la presión de los neumáticos
EBU00258
Owner’s manual and tool kit
You are recommended to put this owner’s manual
and low-pressure tire gauge in the vinyl bag and
always carry them along with the owner’s tool kit
under the seat. The service information included in
this manual is intended to provide you, the owner,
with the necessary information for completing your
own preventive maintenance and minor repairs.
The tools provided in the Owner’s tool kit are suffi-
cient for this purpose, except that a torque wrench
is also necessary to properly tighten nuts and
bolts.NOTE:If you do not have a torque wrench available dur-
ing a service operation requiring one, take your
machine to a Yamaha dealer to check the torque
settings and adjust them as necessary.
U5LP61.book Page 3 Monday, August 27, 2001 3:49 PM

8-25 1. Oil filter cartridge
2. Oil filter wrench
1. Cartouche du filtre à huile
2. Clé pour filtre à huile
1. Cartucho del filtro de aceite
2. Llave para filtros de aceite
1. O-ring
1. Joint torique
1. Junta tórica
7. Remove the oil filter cartridge with an oil filter
wrench.NOTE:_ An oil filter wrench is available at a nearby
Yamaha dealer. _8. Apply a thin coat of engine oil to the O-ring of
the new oil filter cartridge.NOTE:_ Make sure that the O-ring is properly seated. _9. Install a new oil filter cartridge and tighten it to
the specified torque with a torque wrench.
10. Install the crankcase engine oil drain bolt and
the engine oil tank drain bolt, then tighten
them to the specified torques. Tightening torque:
Oil filter cartridge:
17 Nm (1.7 m·kgf)
Tightening torques:
Crankcase engine oil drain bolt:
30 Nm (3.0 m·kgf)
Engine oil tank drain bolt:
25 Nm (2.5 m·kgf)
U5LP61.book Page 25 Monday, August 27, 2001 3:49 PM

8-35 1. Coolant reservoir cap
2. Hose
1. Bouchon du vase d’expansion
2. Flexible
1. Tapa del depósito de refrigerante
2. Manguera
5. Remove the coolant reservoir cap.
6. Disconnect the hose on the coolant reservoir
side, and then drain the coolant from the
coolant reservoir.
7. After draining the coolant, thoroughly flush
the cooling system with clean tap water.
8. Replace the coolant drain bolt washer if it is
damaged, and then tighten the coolant drain
bolt to the specified torque.
9. Install the coolant reservoir hose.
10. Pour the recommended coolant into the radi-
ator until it is full.
11. Fill the coolant reservoir with coolant up to
the maximum level. Tightening torque:
Coolant drain bolt:
10 Nm (1.0 m·kgf)
U5LP61.book Page 35 Monday, August 27, 2001 3:49 PM

8-43 a. Spark plug gap
a.Écartement des électrodes
a. Huelgo de la bujía
Installation
1. Measure the electrode gap with a wire thick-
ness gauge and, if necessary, adjust the gap
to specification.
2. Clean the gasket surface. Wipe off any grime
from the threads.
3. Install the spark plug and tighten it to the
specified torque.NOTE:_ If a torque wrench is not available when you are in-
stalling a spark plug, a good estimate of the correct
torque is 1/4 to 1/2 turn past finger tight. Have the
spark plug tightened to the specified torque as
soon as possible. _4. Install the spark plug cap.Specified spark plug:
DPR8EA-9 (NGK)
Spark plug gap:
0.8 ~ 0.9 mm
Tightening torque:
Spark plug:
17.5 Nm (1.75 m·kgf)
U5LP61.book Page 43 Monday, August 27, 2001 3:49 PM

8-73
5. Screw in the adjusting bolt on the brake cali-
per by hand until it feels tight, then screw it
out 1/8 turn. Tighten the adjusting bolt locknut
to the specified torque.CAUTION:_ When tightening the locknut, hold the adjust-
ing bolt with a wrench so that the adjusting
bolt does not turn together with the locknut. _
WARNING
_ Operating with improperly adjusted brakes
could cause the brakes to malfunction, result-
ing in reduced braking performance. This
could increase the chance of a collision or ac-
cident. After adjusting the parking brake, block
the rear of the machine 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. _
Tightening torque:
Locknut:
16 Nm (1.6 m·kgf)
U5LP61.book Page 73 Monday, August 27, 2001 3:49 PM

8-81 1. Upper wheel hub nut 2. Lower wheel hub nut
1.Écrou supérieur de moyeu de roue
2.Écrou inférieur de moyeu de roue
1. Tuerca superior del cubo de la rueda
2. Tuerca inferior del cubo de la rueda
1. Locknut (× 2) 2. Adjusting bolt (× 2)
3. Alignment marks (× 2)
1. Contre-écrou (× 2) 2. Boulon de réglage (× 2)
3. Repères d’alignement (× 2)
1. Contratuerca (× 2) 2. Perno de ajuste (× 2)
3. Marcas de alineación (× 2)
EBU01026
Drive chain slack adjustment
1. Loosen the rear wheel hub upper and lower
nuts.
2. Loosen the adjusting bolt locknuts on each
side of the swingarm. To tighten the drive
chain, turn the adjusting bolts in direction
a.
To loosen the drive chain, turn the adjusting
bolts in direction
b and push the wheels for-
ward. Turn each adjusting bolt exactly the
same amount to maintain correct axle align-
ment.
There are alignment marks on each side of
the swingarm and on the hub. Use them to
check for proper wheel axle alignment.
3. After adjusting, tighten the adjusting bolt lock-
nuts and the wheel hub nuts to the specified
torques.
Tightening torques:
Locknut:
16 Nm (1.6 m·kgf)
Upper wheel hub nut:
90 Nm (9.0 m·kgf)
Lower wheel hub nut:
90 Nm (9.0 m·kgf)
U5LP61.book Page 81 Monday, August 27, 2001 3:49 PM