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
8-71 1. Locknut 2. Adjusting bolt
1. Contre-écrou 2. Boulon de réglage
1. Contratuerca 2. Perno de ajuste
1. Locknut 2. Adjusting bolt
a. Cable length
1. Contre-écrou 2. Boulon de réglage
a. Longueur de câble
1. Contratuerca 2. Perno de ajuste
a. Longitud del cable
EBU00953
Parking brake adjustment
Parking brake adjustment may be required if the
parking brake does not hold properly.
1. Fully loosen the parking brake cable adjust-
ing bolt locknut and the adjusting bolt on the
clutch lever.
2. Loosen the adjusting bolt locknut and the ad-
justing bolt on the rear brake caliper.
3. Turn the adjusting bolt on the clutch lever so
that cable length
a is 64 ~ 68 mm.NOTE:If the cable cannot be adjusted to specification,
consult a Yamaha dealer. _4. Tighten the adjusting bolt locknut on the
clutch lever.
U5LP61.book Page 71 Monday, August 27, 2001 3:49 PM
10-1
EBU00428
SPECIFICATIONS
MODEL YFM660R
Dimension:
Overall length
Overall width
Overall height
Seat height
Wheel base
Ground clearance
Minimum turning radius1,830 mm
1,100 mm
1,150 mm
860 mm
1,245 mm
265 mm
3,300 mm
Basic weight:
With oil and full fuel tank 193 kg
Engine:
Type
Cylinder arrangement
Displacement
Bore
× stroke
Compression ratio
Starting system
Lubrication systemLiquid-cooled, 4-stroke, SOHC
Forward inclined single cylinder
660 cm
3
100
× 84 mm
9.2 : 1
Electric starter
Dry sump
U5LP61.book Page 1 Monday, August 27, 2001 3:49 PM
