2004 YAMAHA YFM50S brake

7-75
8If your ATV starts to slide sideways:
Steer in the direction of the slide if you have
the room.
Applying the brakes or accelerating is not rec-
ommended until you have corrected the slide.
(See pages 7-69–7-71.)
8If your ATV can’t make it up a hill you are try-
ing to climb:
Turn the ATV around if you still have forward
speed. If not, stop, dismount on the uphill side
of the ATV and physically turn the ATV
around. If the ATV starts to slip backwards
DO NOT USE THE REAR BRAKE - the ATV
may tip over on top of you. Instead, apply the
front brake or dismount the ATV on the uphill
side. (See pages 7-43–7-53.)
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7-77
8If your ATV is traversing a sloping surface:
Be sure to ride with your weight positioned
towards the uphill side of the ATV to maintain
proper balance. If the ATV starts to tip, steer
down the hill (if there are no obstacles in your
way) to regain balance. If you discover that
the ATV is going to tip over, dismount on the
uphill side. (See pages
7-59–7-61.)
8If your ATV encounters shallow water:
Ride slowly and carefully through slow mov-
ing water, watching for obstacles. Be sure to
let water drain from the ATV and CHECK
YOUR BRAKES FOR PROPER OPERATION
when you come out of the water. Do not con-
tinue to ride your ATV until you have regained
adequate braking ability. (See pages 7-63–
7-65.)
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8-7
EBU00262
PERIODIC MAINTENANCE/LUBRICATION
INITIAL EVERY
ITEM ROUTINE 1 3 6 6 1
month months months months year
Valves*9Check valve clearance.
9Adjust if necessary.2 222
Cam chain*9Check chain tension.
9Adjust if necessary.2 222
9Check condition.
Spark plug9Adjust gap and clean.22222
9Replace if necessary.
Air filter element9Clean. Every 20–40 hours.
9Replace if necessary. (more often in wet or dusty areas)
Carburetor*9Check idle speed/choke lever operation.
2222
9Adjust if necessary.
Crankcase breather9Check breather hose for cracks or damage.
system*9Replace if necessary.222
9Check for leakage.
Exhaust system*9Tighten if necessary.222
9Replace gasket if necessary.
Fuel line*9Check fuel hose for cracks or damage.
222
9Replace if necessary.
Engine oil9Replace (warm engine before draining).2 222
Final gear oil9Check oil level/oil leakage.
22
9Replace every 12 months.
Brakes*9Check operation.
22222
9Adjust if necessary.
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8-41
EBU01218
Front and rear brake shoe inspection
A wear indicator is provided on each brake. The
indicators allows checking of brake shoe wear
without disassembling the brake. Apply the
brake and check the position of the indicator. If
the indicator reaches the wear limit line or mark,
ask a Yamaha dealer to replace the shoes
as a set.
wq
1
2
1. Wear limit line 2. Wear indicator1. Ligne de limite d’usure 2. Indicateur d’usure1. Línea de límite de desgaste 2. Inidcador de desgaste
1. Wear limit mark 2. Wear indicator
1. Marque de limite d’usure 2. Indicateur d’usure1. Marca de límite de desgaste 2. Indicador de desgasteFront
AvantDelantero
RearArrièreTrasero
5YF-9-60 8 4/24/03 6:35 PM Page 8-41

wq
re
1. Upper locknut 2. Upper adjusing bolt
3. Lower locknut 4. Lower adjusting bolt
1. Contre-écrou supérieur 2. Boulon de réglage supérieur
3. Contre-écrou inférieur 4. Boulon de réglage inférieur
1. Contratuerca superior 2. Perno de ajuste superior
3. Contratuerca inferior 4. Perno de ajuste nferior
8-43
EBU00324
Front brake lever free play adjustment
NOTE:
Before adjusting the brake, inspect the front
brake shoes.
The front brake lever free play should be adjust-
ed to 10–12 mm at the brake lever pivot. If the
free play is incorrect, adjust as follows:
1. Loosen the upper locknut and fully turn in
the adjusting bolt.
2. Loosen the lower locknut.
3. Turn the lower adjusting bolt until specified
free play is obtained.
a
a. Free playa. Jeua. Juego
Specified free play: 10–12 mm
5YF-9-60 8 4/24/03 6:35 PM Page 8-43

8-45
4. Tighten the lower locknut.
5. While applying the front brake, turn out the
upper adjusting bolt until the upper and
lower cable lengths are equal. The cable
joint will become vertical.
6. Tighten the upper locknut.
w
Operating with improperly serviced or
adjusted brakes could cause loss of braking
ability, which could lead to an accident.
After servicing:
8Make sure the brakes operate smoothly
and that the free play is correct.
8Make sure the brakes do not drag.
Replacement of brake components requires
professional knowledge. These procedures
should be performed by a Yamaha dealer.
q
a
a=a’
a’
1. Cable joint1. Raccord de câble1. Conexión del cable
5YF-9-60 8 4/24/03 6:35 PM Page 8-45

8-47
EBU14370
Rear brake lever adjustment
Brake lever free play adjustment
1. Loosen the brake cable locknut.
2. Turn the adjusting bolt at the brake lever
until brake lever free play is 5–8 mm.
3. Tighten the locknut.
NOTE:
If specified free play cannot be obtained, tighten
the brake cable adjusting nut at the rear wheel
hub until brake lever free play is 5–8 mm.
wqa
1
1. Locknut 2. Adjusting bolt1. Contre-écrou 2. Boulon de réglage1. Contratuerca 2. Perno de ajustea. Free playa. Jeua. Juego
1. Brake cable adjusting nut
1. Ecrou de réglage du câble de frein1. Tuerca de ajuste del cable de freno
5YF-9-60 8 4/24/03 6:35 PM Page 8-47

8-49
w
Operating with improperly serviced or
adjusted brakes could cause loss of braking
ability, which could lead to an accident.
After servicing:
8Make sure the brakes operate smoothly
and that the free play is correct.
8Make sure the brakes do not drag.
8Replacement of brake components
requires professional knowledge. These
procedures should be performed by a
Yamaha dealer.
5YF-9-60 8 4/24/03 6:35 PM Page 8-49