2004 YAMAHA YFM50S torque

5-17
EBU01083
Throttle lever
Check to see that the throttle lever operates cor-
rectly. It must open smoothly and spring back to
the idle position when released. Have a Yamaha
dealer repair as necessary for proper operation.
EBU11620
Fittings and fasteners
Always check the tightness of chassis fittings
and fasteners before a ride. Take the machine
to a Yamaha dealer or refer to the Service
Manual for correct tightening torque.
EBU11700
Switches
Check the operation of all switches. Have a
Yamaha dealer repair as necessary for proper
operation.
EBU00499
Battery
Check fluid level and fill if necessary. Use only
distilled water if refilling is necessary. (See
pages 8-57–8-63.)
5YF-9-60 4~5 4/24/03 7:41 PM Page 44

8-3
EBU01222
Owner’s manual and tool kit
You are recommended to put this owner’s man-
ual and low-pressure tire gauge in the vinyl bag
and always carry them along with the owner’s
tool kit under the seat. The service information
included in this manual is intended to provide
you, the owner, with the necessary information
for completing your own preventive maintenance
and minor repairs. The tools provided in the
owner’s tool kit are sufficient for this purpose,
except that a torque wrench is also necessary to
properly tighten nuts and bolts.
NOTE:
If you do not have a torque wrench available
during a service operation requiring one, take
your machine to a Yamaha dealer to check the
torque settings and adjust them as necessary.
q
w
e
1. Owner’s manual
2. Low-pressure tire gauge
3. Owner’s tool kit
1. Manuel du propriétaire
2. Manomètre basse pression pour pneus
3. Trousse à outils du propriétaire
1. Manual del propietario
2. Comprobador de presión de los neumáticos
3. Equipo de herramientas del propietario
5YF-9-60 8 4/24/03 6:35 PM Page 8-3

8-15
Engine oil replacement
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes
and stop it.
3. Place a container under the engine.
4. Remove the dipstick and drain bolt to drain
the oil.
5. Inspect the O-ring and replace if damaged.
6. Install the drain bolt and tighten to specifi-
cation.
1
1. Drain bolt1. Bouchon de vidange1. Perno de drenaje
Tightening torque
Drain bolt:
20 Nm (2.0 m0kgf)
5YF-9-60 8 4/24/03 6:35 PM Page 8-15

8-21
2. Place a container under the final gear
case.
3. Remove the dipstick and drain bolt to drain
the oil.
4. Install the drain bolt and tighten to specifi-
cation.
5. Fill the final gear case with oil.
cC
Be sure no foreign material enters the final
gear case.
6. Install the dipstick.
7. Check for oil leakage. If oil leakage is
found, check for the cause.
q
1. Drain bolt1. Boulon de vidange1. Perno de drenaje
Tightening torque
Drain bolt:
23 Nm (2.3 m0kgf)
Recommended oil:
SAE 80 API “GL-4” Hypoid gear oil
Oil quantity:
0.12 L
5YF-9-60 8 4/24/03 6:35 PM Page 8-21

8-25
Before installing the spark plug, measure the
electrode gap with a wire thickness gauge and
adjust it to specification.
When installing the spark plug, always clean the
gasket surface and its mating surface. Wipe off
any grime from the threads and tighten it to the
specified torque.
a
a. Spark plug gapa. Écartement des électrodesa. Separación entre electrodos de la bujía
Spark plug gap:
0.6–0.7 mm
Tightening torque:
Spark plug:
12.5 Nm (1.25 m0kgf)
Standard spark plug:
CR7HS (NGK)
5YF-9-60 8 4/24/03 6:35 PM Page 8-25

1. Wheel nut (×4) 2. Wheel nut (×3)1. Ecrou de roue (×4)2. Ecrou de roue (×3)1. Tueroa de rueda (×4) 2. Tueroa de rueda (×3)
8-55
EBU01112
Wheel removal
1. Loosen the wheel nuts.
2. Elevate the ATV and place a suitable stand
under the frame.
3. Remove the nuts from the wheel.
4. Remove the wheel.
EBU07390
Wheel installation
When installing the wheel, reverse the removal
procedure.
NOTE:
The arrow mark on the tire must point toward
the rotating direction of the wheel.
Tighten the wheel nuts to the specified torque.
Wheel nut torque:
Front: 28 Nm (2.8 m0kgf)
Rear: 28 Nm (2.8 m0kgf)
1
12
FrontAvantDelantera
RearArrièreTrasera
5YF-9-60 8 4/24/03 6:35 PM Page 8-55

11-1
EBU01070
Conversion table
All specification data in this manual are listed in SI
and METRIC UNITS.
Use this table to convert METRIC unit values to
IMPERIAL unit values.
Example:
METRIC
VALUECONVERSION
FACTORIMPERIAL
VALUE
2 mm× 0.03937 = 0.08 in
Conversion tableMETRIC SYSTEM TO IMPERIAL SYSTEM
Metric unitConversion
factorImperial unit
Torquem·kgf
m·kgf
cm·kgf
cm·kgf
× 7.233× 86.794× 0.0723× 0.8679ft·lbf
in·lbf
ft·lbf
in·lbf
Weightkg
g× 2.205× 0.03527lb
oz
Speed km/h× 0.6214 mi/h
Distancekm
m
m
cm
mm× 0.6214× 3.281× 1.094× 0.3937× 0.03937mi
ft
yd
in
in
Volume,
Capacitycc (cm3)
cc (cm3)
L (liter)
L (liter)× 0.03527× 0.06102× 0.8799× 0.2199oz (IMP liq.)
cu·in
qt (IMP liq.)
gal (IMP liq.)
Miscellaneouskg/mm
kgf/cm
2
°C
× 55.997× 14.2234× 1.8 + 32 lb/in
psi (lbf/in
2)
°F
5YF-9-60 9~ 4/24/03 6:34 PM Page 324