2004 YAMAHA YFM50S 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
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Rear brake lever adjustment ..............8-47
Cable inspection and lubrication ........8-51
Brake lever lubrication ........................8-53
Knuckle shaft and steering shaft
lubrication .........................................8-53
Wheel removal ...................................8-55
Wheel installation ...............................8-55
Battery ................................................8-57
Replenishing the battery fluid .............8-61
Fuse replacement ...............................8-65
Troubleshooting ..................................8-67
Troubleshooting chart .........................8-71
CLEANING AND STORAGE....................9-1
A. Cleaning ...........................................9-1
B. Storage ............................................9-7SPECIFICATIONS .................................10-1
Conversion Table ...................................11-1
9
10
11
5YF-9-60 ~3 4/24/03 7:40 PM Page 16

2-13
8Never operate an ATV in fast flowing water or
in water deeper than that recommended in
this manual. Remember that wet brakes may
have reduced stopping ability. Test your
brakes after leaving water. If necessary, apply
them several times to let friction dry out the
linings.
8Always use the size and type tires specified in
this manual.
8Always maintain proper tire pressure as
described in this manual.
8Never modify an ATV through improper instal-
lation or use of accessories.
8Never exceed the stated load capacity for an
ATV. Cargo should be properly distributed
and securely attached. Reduce speed and fol-
low instructions in this manual for carrying
cargo or pulling a trailer. Allow greater dis-
tance for braking.
5YF-9-60 ~3 4/24/03 7:40 PM Page 48

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

4-17
EBU00070
Front brake lever
The front brake lever is located on the right han-
dlebar. Pull it toward the handlebar to apply the
front brake.
EBU00720
Rear brake lever
The rear brake lever is located on the left han-
dlebar. Pull it toward the handlebar to apply the
rear brake.
q
q
1. Front brake lever1. Levier de frein avant1. Palanca del freno delantero
1. Rear brake lever
1. Levier de frein arrière1. Palanca del freno trasero
5YF-9-60 4~5 4/24/03 7:41 PM Page 16

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

5-1
EBU00113
PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Brakes9Check operation, condition and free play.
5-5–5-7, 8-41–8-49
9Adjust if necessary.
Fuel9Check fuel level.
9Fill with fuel if necessary.5-9–5-11
Engine oil9Check oil level.
9Fill with oil if necessary.5-11–5-13, 8-13–8-17
Final gear oil9Check for leakage. 5-15, 8-19–8-21
Throttle9Check for proper throttle cable operation. 5-17
Wheels and tires9Check tire pressure, wear and damage. 5-19–5-25, 8-55
Fittings and fasteners9Check all fittings and fasteners. 5-17
Switches9Check operation. 5-17
Battery9Check fluid level.
5-17, 8-57–8-63
9Fill with distilled water if necessary.
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