lock YAMAHA YFM660R 2001 User Guide

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Speed limiter
For riders inexperienced with this model, this
model is equipped with a speed limiter in the
throttle lever housing. The speed limiter limits
the power and top speed of the machine. Turn-
ing the screw in decreases top speed, and turn-
ing it out increases top speed.
Loading and accessories
Use extra caution when riding the machine
with additional loads, such as accessories or
cargo. The machine’s handling may be ad-
versely affected. Reduce your speed when
adding additional loads.
1. Locknut 2. Adjusting screw
1. Contre-écrou 2. Vis de réglage
1. Contratuerca 2. Tornillo de ajuste

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WARNING
Use proper gear and maintain steady speed
when climbing a hill.
If you lose all forward speed:
Keep weight uphill.
Apply the brakes.
Lock parking brake, after you are stopped.
If you begin rolling backwards:
Keep weight uphill.
Never apply the rear brake while rolling
backwards. Apply the front brake.
When fully stopped, apply rear brake as
well, and then lock parking brake.
Dismount on uphill side or to a side if pointed
straight uphill. Turn the ATV around and re-
mount, following the procedure described in
the Owner’s Manual.

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1. Unlock
1. Déverrouiller
1. Levántelo
1. Guide 2. Air filter element
3. Element plate
1. Guide 2. Élément du filtre à air
3. Plaquette de retenue d’élément
1. Guía 2. Elemento filtrante
3. Element plate
5. Squeeze the excess solvent out of the fil-
ter element and let it dry.
CAUTION:
Do not twist the filter element when squeez-
ing it.
6. Inspect the element and replace it if dam-
aged.
7. Apply foam air filter oil to the element. If
foam air filter oil is not available, motor oil
may be used.
NOTE:
The element should be wet but not dripping.
8. Pull the element over its frame.
9. Install the element assembly.
10. Install the air filter case cover and be sure
to connect the hose.

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EBU00303
Valve clearance adjustment
The correct valve clearance changes with use,
resulting in improper fuel/air supply or engine
noise. To prevent this, the valve clearance
must be adjusted regularly. This adjustment
however, should be left to a professional
Yamaha service technician.
EBU00306
Reverse lock release cable adjustment
The reverse lock release cable stretches with
use, resulting in improper function. To prevent
this, the cable must be adjusted regularly. This
adjustment, however, should be left to a
Yamaha dealer.

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1. Locknut 2. Adjusting bolt
a. Throttle lever free play
1. Contre-écrou 2. Boulon de réglage
a. Jeu du levier d’accélération
1. Contratuerca 2. Perno de ajuste
a. Juego libre de la palanca del acelerador
EBU00307
Throttle lever adjustment
NOTE:
Adjust the engine idling speed before adjust-
ing the throttle lever free play.
1. Loosen the locknut.
2. Turn the adjusting bolt until the throttle le-
ver free play is 3 ~ 5 mm.
3. Tighten the locknut.

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3. Refill with the same type of brake fluid.
Mixing fluids may result in a harmful
chemical reaction and lead to poor brake
performance.
4. Be careful that water does not enter the
master cylinder when refilling. Water will
significantly lower the boiling point of the
fluid and may result in vapor lock.
5. Brake fluid may deteriorate painted sur-
faces or plastic parts. Always clean up
spilled fluid immediately.
6. Have a Yamaha dealer check the cause if
the brake fluid level goes down.

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EBU00775*
Parking brake adjustment
Parking brake adjustment may be required if
the parking brake does not hold properly.
1. Fully loosen the parking brake cable ad-
justing bolt locknut and the adjusting bolt
on the left brake lever.
2. Loosen the adjusting bolt locknut and the
adjusting bolt on the rear brake caliper.
3. Turn the adjusting bolt on the brake 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
brake lever.
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.
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. Longeur de câble
1. Contratuerca 2. Perno de ajuste
A. Longitud del cable

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5. Screw in the adjusting bolt on the brake
caliper by hand until it feels tight, then
screw it out 1/8 turn. Tighten the adjusting
bolt locknut to the specified torque.
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 acci-
dent. 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, per-
form the adjustment again. Tightening torque:
16 Nm (1.6 m·kg)

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EBU00741
Clutch lever free play adjustment
The clutch lever free play should be adjusted to
5 ~ 10 mm.
1. Loosen the locknut at the clutch lever.
2. Turn the adjusting bolt at the clutch lever
in direction
a to increase the free play or
in direction
b to decrease the free play.
3. Tighten the locknut at the clutch lever.
NOTE:
If the specified free play cannot be obtained,
proceed with the following steps.
4. Loosen the locknut at the clutch lever.
5. Turn the adjusting bolt at the clutch lever
in direction
a to loosen the cable.
6. Loosen the locknut at the crankcase side.
7. Turn the adjusting nut at the crankcase in
direction
a to increase the free play or in
direction
b to decrease the free play.
8. Tighten the locknut at the crankcase and
the clutch lever.
1. Locknut 2. Adjusting bolt c. Free play
1. Contre-écrou 2. Boulon de réglage c. Jeu
1. Contratuerca 2. Perno de ajuste c. Juego libre
1. Locknut 2. Adjusting nut
1. Contre-écrou 2. Écrou de réglage
1. Contratuerca 2. Tuerca de ajuste

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EBU00804
Drive chain slack adjustment
1. Loosen the rear wheel hub upper and low-
er nuts.
2. Loosen the adjusting bolt locknuts on
each side of the swingarm. To tighten the
drive chain, turn the adjusting bolts in di-
rectiona. To loosen the drive chain, turn
the adjusting bolts in direction b and
push the wheels forward. Turn each ad-
justing bolt exactly the same amount to
maintain correct axle alignment.
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 locknuts and
the wheel hub nuts to the specified
torques.
Tightening torques:
Locknut:
16 Nm (1.6 m·kg)
Upper wheel hub nut:
90 Nm (9.0 m·kg)
Lower wheel hub nut:
90 Nm (9.0 m·kg)
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 buje de la rueda
2. Tuerca inferior del buje 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)