engine oil YAMAHA BIG BEAR PRO 400 2004 User Guide

8-15 1. Clamp
1. Bride
1. Mordaza
1. Drain bolt (engine oil) 2. O-ring
3. Compression spring 4. Oil strainer
1. Boulon de vidange (huile de moteur) 2. Joint torique
3. Ressort de compression 4. Crépine à huile
1. Perno de drenaje (aceite del motor) 2. Junta tórica
3. Muelle de compresión 4. Colador de aceite
Engine oil replacement and oil filter cleaning
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes, and
then stop it.
3. Place a container under the engine to collect
the used oil.
4. Remove the clamp by removing the screw.
5. Remove the engine oil filler cap and drain bolt
to drain the oil.CAUTION:_ When removing the drain bolt, the compres-
sion spring, oil strainer and O-ring will fall out.
Take care not to lose these parts. _
U4SH6B.book Page 15 Tuesday, May 27, 2003 4:39 PM

8-17 1. Engine oil filter element cover bolt (× 3)
2. Oil filter element cover
1. Boulon de couvercle de l’élément de filtre à huile moteur (× 3)
2. Couvercle de l’élément de filtre à huile
1. Perno de la tapa del elemento del filtro de aceite de motor (× 3)
2. Tapa del elemento del filtro de aceite
1. Engine oil filter element 2. O-ring (× 2)
1.Élément du filtre à huile moteur 2. Joint torique (× 2)
1. Element del filtro de aceite de motor 2. Junta tórica (× 2)
6. Remove the shift pedal by removing the bolt.
7. Remove the oil filter element cover, and then
the oil filter element.
8. Clean the oil strainer and oil filter element
with solvent.
9. Inspect the O-ring and replace it if damaged.
10. Install the oil filter element, O-ring, oil filter el-
ement cover, compression spring, oil strainer
and drain bolt. Tighten the drain bolt to the
specified torque.CAUTION:_ Before installing the drain bolt, be sure to in-
stall the O-ring, compression spring and oil
strainer. _
Tightening torque
Drain bolt (engine):
32 Nm (3.2 m·kgf)
Oil filter element cover bolt:
10 Nm (1.0 m·kgf)
U4SH6B.book Page 17 Tuesday, May 27, 2003 4:39 PM

8-19
11. Fill the engine with oil and install the oil filler
cap.CAUTION:_ Make sure that no foreign material enters the
crankcase. _
Recommended oil:
See page 10-2.
Oil quantity:
Without oil filter element replacement:
2.40 L
With oil filter element replacement:
2.50 L
U4SH6B.book Page 19 Tuesday, May 27, 2003 4:39 PM

8-21
12. Install the clamp by installing the screw.
13. Install the shift pedal by installing the bolt.
14. Warm up the engine for several minutes at
idle speed. Check for oil leakage while warm-
ing up.CAUTION:_ If oil leakage is found, stop the engine immedi-
ately and check for the cause. _
U4SH6B.book Page 21 Tuesday, May 27, 2003 4:39 PM

8-23 1. Bolt (× 3)
1. Boulon (× 3)
1. Perno (× 3)
1. Oil filler bolt
1. Boulon de l’orifice de remplissage d’huile
1. Perno del orificio de llenado de aceite
EBU00462
Transfer gear oil replacementNOTE:When replacing the transfer gear oil, replace the
engine oil also.1. Remove the transfer gear case guard.
2. Place the machine on a level place.
3. Place a container under the transfer gear
case.
4. Remove the oil filler bolt and drain bolt to
drain the oil.
5. Install the drain bolt and tighten to specifica-
tion.
Tightening torque:
Drain bolt (transfer gear case):
20 Nm (2.0 m·kgf)
E-8.fm Page 23 Thursday, May 29, 2003 11:49 AM

8-25 1. Drain bolt
1. Boulon de vidange
1. Perno de drenaje
6. Fill the transfer gear case with oil.CAUTION:
Be sure no foreign material enters the transfer
gear case.7. Install the filler bolt and tighten to specifica-
tion.
8. Check for oil leakage. If oil leakage is found,
check for the cause.
9. Reinstall the transfer gear case guard.Recommended oil: See page 10-2
Quantity:
Transfer gear oil and engine oil with
filter replacement:
2.8 L
Tightening torque:
Filler bolt (transfer gear case):
23 Nm (2.3 m·kgf)
U4SH6B.book Page 25 Tuesday, May 27, 2003 4:39 PM

8-43 1. Air filter element
1.Élément du filtre à air
1. Elemento del filtro de aire
1. Element plate 2. Air filter element
3. Frame
1. Plaque d’élément 2.Élément du filtre à air
3. Armature
1. Placa del elemento 2. Elemento del filtro de aire
3. Bastidor
3. Remove the air filter element.
4. Remove the air filter element from the frame.
5. Wash the air filter element gently but thor-
oughly in solvent.
WARNING
_ Always use parts cleaning solvent to clean the
air filter element. Never use low flash point sol-
vents or gasoline to clean the air filter element
because the engine could catch fire or ex-
plode. _6. Squeeze the excess solvent out of the air fil-
ter element and let it dry.CAUTION:_ Do not twist the air filter element when squeez-
ing it. _7. Inspect the air filter element. If damaged, re-
place it.
8. Apply SAE 10W30 engine oil to the air filter
element.NOTE:_ The air filter element should be wet but not drip-
ping. _
U4SH6B.book Page 43 Tuesday, May 27, 2003 4:39 PM

8-77
EBU00570
Cable inspection and lubrication
WARNING
Inspect cables frequently and replace if dam-
aged. Corrosion can result when the outer cov-
ering of control cables becomes damaged.
Cables can also become frayed or kinked. Op-
eration of controls could be restricted, which
could cause an accident or injury.Lubricate the inner cables and the cable ends. If
the cables do not operate smoothly, ask a Yamaha
dealer to replace them.
EBU00727
Brake and shift pedal/brake lever lubrication
Lubricate the pivoting parts of each lever and ped-
al.Recommended lubricant:
Engine oil
Recommended lubricant:
Lithium-soap-based grease
(all-purpose grease)
U4SH6B.book Page 77 Tuesday, May 27, 2003 4:39 PM

9-7
EBU00427
B. STORAGE
Long term storage (60 days or more) of your ma-
chine will require some preventive procedures to
guard against deterioration. After thoroughly
cleaning the machine, prepare for storage as fol-
lows:
1. Fill the fuel tank with fresh fuel and add fuel
stabilizer (if available).NOTE:Use of fuel stabilizer eliminates the need to drain
the fuel system. Consult a Yamaha dealer if the
fuel system is to be drained instead.2. Remove the spark plug, pour about one ta-
blespoon of SAE 10W30 or 20W40 motor oil
in the spark plug hole and reinstall the spark
plug. Ground the spark plug wire and turn the
engine over several times to coat the cylinder
wall with oil.
3. Lubricate all control cables.
4. Block up the frame to raise all wheels off the
ground.
U4SH6B.book Page 7 Tuesday, May 27, 2003 4:39 PM

10-1
EBU00428
1-SPECIFICATIONS
Model YFM400FP/YFM400FW
Dimensions:
Overall length 1,956 mm
Overall width 1,155 mm
Overall height 1,144 mm
Seat height 845 mm
Wheelbase 1,210 mm
Ground clearance 215 mm
Minimum turning radius 3,500 mm
Basic weight:
With oil and full fuel tank 286.0 kg
Engine:
Engine type Air-cooled 4-stroke, SOHC
Cylinder arrangement Forward-inclined single cylinder
Displacement 386.0 cm
3
Bore
× stroke 83.0 ×
71.5 mm
Compression ratio 8.60:1
Starting system Electric and recoil starter
Lubrication system Wet sump
U4SH6B.book Page 1 Tuesday, May 27, 2003 4:39 PM