2004 YAMAHA YFM50S parking brake

LOCATION OF THE WARNING AND
SPECIFICATION LABELS .......................1-1
SAFETY INFORMATION .........................2-1
DESCRIPTION AND MACHINE
IDENTIFICATION.....................................3-1
Identification number records ...............3-3
Key identification number .....................3-5
Vehicle identification number ...............3-7
Model label ...........................................3-9
CONTROL FUNCTIONS..........................4-1
Main switch ...........................................4-1
Indicator lights ......................................4-3
Handlebar switches ..............................4-3
Engine stop switch with cord (lanyard).....4-7
Throttle lever ......................................4-11
Speed limiter ......................................4-13
Front brake lever ................................4-17Rear brake lever .................................4-17
Parking brake .....................................4-19
Shift lever ...........................................4-21
Fuel tank cap ......................................4-21
Fuel cock ............................................4-23
Choke lever ........................................4-25
Seat ....................................................4-27
PRE-OPERATION CHECKS ...................5-1
Front and rear brakes ...........................5-5
Fuel ......................................................5-9
Engine oil ............................................5-11
Final gear oil .......................................5-15
Throttle lever ......................................5-17
Fittings and fasteners .........................5-17
Switches .............................................5-17
Battery ................................................5-17
Tires ...................................................5-19
How to measure tire pressure ............5-23
Tire wear limit .....................................5-25
EBU00015
CONTENTS
1
2
3
4
5
5YF-9-60 ~3 4/24/03 7:40 PM Page 14

OPERATION ............................................6-1
Starting a cold engine ...........................6-3
Starting a warm engine ......................6-11
Warming up ........................................6-11
To start out and accelerate .................6-13
To decelerate .....................................6-17
Engine break-in ..................................6-19
Parking ...............................................6-23
Parking on a slope ..............................6-25
Accessories and loading ....................6-27
Riding Your ATV ......................................7-1
Getting to know your ATV.....................7-3
Ride with care and good
judgement ...........................................7-5
Be careful where you ride ...................7-27
Turning your ATV ...............................7-39
Climbing uphill ....................................7-43
Riding downhill ...................................7-55
Crossing a slope .................................7-59
Crossing through shallow water .........7-63Riding over rough terrain ....................7-67
Sliding and skidding ...........................7-69
What to do if ......................................7-73
What to do .........................................7-73
PERIODIC MAINTENANCE AND
ADJUSTMENT .........................................8-1
Owner’s manual and tool kit .................8-3
Periodic maintenance/lubrication .........8-7
Engine oil ............................................8-13
Final gear oil .......................................8-19
Spark plug inspection .........................8-23
Air filter cleaning .................................8-27
Carburetor adjustment ........................8-35
Idle speed adjustment ........................8-37
Valve clearance adjustment ...............8-39
Cam chain adjustment ........................8-39
Front and rear brake shoe
inspection .........................................8-41
Front brake lever free play
adjustment ........................................8-436
7
8
5YF-9-60 ~3 4/24/03 7:40 PM Page 15

3-1
EBU00032
DESCRIPTION AND MACHINE
IDENTIFICATION
1. Seat 8. Rear brake lever
2. Front cover 9. Parking brake
3. Fuel cock 10. Neutral indicator light
4. Fuse 11. Front brake lever
5. Engine stop switch with 12. Throttle lever
cord (lanyard) 13. Main switch
6. Footrest 14. Fuel tank cap
7. Shift lever 15. Handlebar switches
NOTE:
The machine you have purchased may differ
slightly from those shown in the figures of this
manual.
1
2
6
89
0q
w e r t
3
5
6 74
5YF-9-60 ~3 4/24/03 7:40 PM Page 66

4-19
EBU00075
Parking brake
Use the parking brake when you have to start
the engine or park the machine, especially on a
slope. Apply the rear brake lever and push down
the lock plate to apply the parking brake.
Squeeze the rear brake lever to release the
parking brake.
w
8Always set the parking brake before start-
ing the engine. The ATV could start mov-
ing unexpectedly if the parking brake is
not applied. This could cause loss of con-
trol or a collision.
8Always be sure you have released the
parking brake before you begin to ride.
The brake could overheat if you ride the
ATV without releasing the parking brake.
You could lose braking performance
which could cause an accident. You could
also wear out the brakes prematurely.
q
1
1. Lock plate1. Plaque de verrouillage1. Placa de bloqueo
1. Locked position
1. Verrouillé1. Posición bloqueada
5YF-9-60 4~5 4/24/03 7:41 PM Page 18

6-3
EBU14410
Starting a cold engine
w
Always make sure all control cables work
smoothly before you begin riding in cold
weather. If the control cables are froze or do
not work smoothly, you could be unable to
control the ATV, which could lead to an acci-
dent or collision.
1. Set the parking brake.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the
engine stop switch to “RUN”.
4. Shift the transmission into neutral.
5YF-9-60 6 4/24/03 6:36 PM Page 2

6-13
1
2
1. Shift lever 2. Drive position1. Levier de sélecteur 2. Vitesse de marche1. Palanca del cambio 2. Posición de marcha
EBU14400
To start out and accelerate:
1. Release the throttle lever.
cC
Always close the throttle before shifting the
transmission into the drive position.
Otherwise, damage to the engine and drive
train may result.
2. Apply the parking brake. (See page 6-23.)
3. Shift the transmission into the drive posi-
tion.
NOTE:
Before shifting the transmission into the drive
position, be sure to apply the parking brake. The
engine will stop if you attempt to shift into drive
without applying the parking brake first.
5YF-9-60 6 4/24/03 6:36 PM Page 12

6-15
4. Squeeze the rear brake lever to release
the parking brake.
5. Gradually open the throttle lever while
slowly releasing the rear brake lever.
w
Always open the throttle gradually. Opening
the throttle abruptly would increase the
chance of an accident. It could make the
machine wheelie or overturn.
5YF-9-60 6 4/24/03 6:36 PM Page 14

6-23
EBU00211
Parking
When parking, stop the engine and shift into
neutral. Turn the fuel cock to “OFF” and apply
the parking brake.q
1
1. Lock plate1. Plaque de verrouillage1. Placa de bloqueo
1. Locked position
1. Verrouillé1. Posición bloqueada
5YF-9-60 6 4/24/03 6:36 PM Page 22