2003 YAMAHA BIG BEAR PRO 400 engine oil

8-23 1. Bolt (× 3)
1. Boulon (× 3)
1. Perno (× 3)
1. Oil filler bolt
1. Boulon de l’orifice de remplissage
1. Perno del orificio de llenado
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)
EE.book Page 23 Monday, June 18, 2001 10:18 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)
EE.book Page 25 Monday, June 18, 2001 10:18 AM

8-45 1. Air filter element
1.Élément du filtre à air
1. Elemento filtrante
1. Element plate 2. Air filter element
3. Guide
1. Plaque d’élément 2.Élément du filtre à air
3. Guide
1. Placa del elemento 2. Elemento filtrante
3. Guía
3. Remove the air filter element, and separate it
from the guide.
4. Wash the element gently but thoroughly 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.5. Squeeze the excess solvent out of the filter
and let it dry.CAUTION:
Do not twist the filter element when squeezing
it.6. Inspect the element. If damaged, replace it.
7. Apply SAE10W30 motor oil to the element.NOTE:The element should be wet but not dripping.
EE.book Page 45 Monday, June 18, 2001 10:18 AM

8-79
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.
EBU00652
Brake and shift pedal/brake lever lubrication
Lubricate the pivoting parts of each lever and ped-
al.Recommended lubricant:
Engine oil
Recommended lubricant:
Engine oil
EE.book Page 79 Monday, June 18, 2001 10:18 AM

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.
EE.book Page 7 Monday, June 18, 2001 10:18 AM

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
Minimum ground clearance 215 mm
Minimum turning radius 3,500 mm
Basic weight:
With oil and full fuel tank 286 kg
Engine:
Engine type Air-cooled 4-stroke, SOHC
Cylinder arrangement Forward-inclined single cylinder
Displacement 386 cm
3
Bore
× stroke 83.0 ×
71.5 mm
Compression ratio 8.6:1
Starting system Electric and recoil starter
Lubrication system Wet sump
EE.book Page 1 Monday, June 18, 2001 10:18 AM

10-2
10
Noise and vibration level:
Noise level (77/311/EEC) 87.1 dB (A)
Vibration on seat (EN1032, ISO5008) Not exceed 0.5 m/s
2
Vibration on handlebar (EN1032, ISO5008) Not exceed 2.5 m/s
2
Engine oil/Transfer gear oil:
Type
Recommended engine oil classification: API Service SE, SF, SG type or higherModel YFM400FP/YFM400FW
-20˚-10˚0˚
10˚20˚30˚40˚50˚C
10W/30
15W/4020W/4020W/50
10W/40
5W/30
CAUTION:
Be sure to use motor oils that do not contain anti-
friction modifiers. Passenger car motor oils (often
labeled “Energy Conserving II”) contain anti-fric-
tion additives which will cause clutch and/or
starter clutch slippage, resulting in reduced com-
ponent life and poor engine performance.
EE.book Page 2 Monday, June 18, 2001 10:18 AM

10-3
Quantity:
Periodic oil change (engine oil): 2.4 L
Periodic oil change
(engine oil with oil filter replacement): 2.5 L
Periodic oil change
(engine oil and transfer gear oil with
oil filter replacement):3.1 L
Transfer gear case oil 0.3 L
Total amount 3.4 L
Final gear oil:
Type SAE 80 API “GL-4” Hypoid gear oil
Quantity
Periodic oil change 0.19 L
Total amount 0.25 L
Air filter: Wet type element
Differential gear oil:
Type SAE80 API “GL-4” Hypoid gear oil
Quantity:
Periodic oil change 0.47 L
Total amount 0.5 LModel YFM400FP/YFM400FW
EE.book Page 3 Monday, June 18, 2001 10:18 AM