2005 YAMAHA BIG BEAR PRO 400 oil type

5-13
EBU12351
Engine oil/transfer gear oil
Make sure the engine oil/transfer gear oil is at the
specified level. Add oil as necessary. (See pages
8-17–8-31.)CAUTION:_

In order to prevent clutch slippage (since
the engine oil also lubricates the clutch),
do not mix any chemical additives. Do not
use oils with a diesel specification of “CD”
or oils of a higher quality than specified. In
addition, do not use oils labeled “ENERGY
CONSERVING II” or higher.


Make sure that no foreign material enters
the crankcase.
_
Recommended engine oil classification:
See page 10-2.
Recommended engine oil/transfer gear oil type
and quantity:
See page 10-2.
U1C160.book Page 13 Wednesday, May 12, 2004 4:55 PM

8-19 1. Engine oil drain bolt 2. O-ring
3. Compression spring 4. Oil strainer
1. Boulon de vidange de l’huile 2. Joint torique
3. Ressort de compression 4. Crépine à huile
1. Perno de drenaje del aceite de motor 2. Junta tórica
3. Muelle de compresión 4. Colador de aceite
1. Clamp
1. Bride
1. Mordaza
5. If the engine oil is at or below the minimum
level mark, add sufficient oil of the recom-
mended type to raise it to the correct level.CAUTION:_ Make sure that no foreign material enters the
crankcase. _6. Insert the dipstick into the oil filler hole, and
then tighten the engine oil filler cap.
To change the engine oil (with or without oil fil-
ter element cleaning)
1. Place the ATV on a level surface.
2. Warm up the engine for several minutes, and
then turn it off.
3. Place a container under the engine to collect
the used oil.
4. Remove the engine oil filler cap, and then re-
move the engine oil drain bolt to drain the oil
from the crankcase.
U1C160.book Page 19 Wednesday, May 12, 2004 4:55 PM

8-33 1. Final gear oil 2. Correct oil level
3. Oil filler bolt
1. Huile de transmission finale 2. Niveau d’huile correct
3. Boulon de l’orifice de remplissage d’huile
1. Aceite de la transmisión final 2. Nivel de aceite correcto
3. Perno del orificio de llenado de aceite
EBU11453
Final gear oil
Checking the final gear oil
1. Place the ATV on a level surface.
2. Remove the oil filler bolt, and then check the
oil level in the final gear case.NOTE:_ The oil level should be at the brim of the filler hole. _3. If the oil is below the brim of the filler hole,
add sufficient oil of the recommended type to
raise it to the correct level.CAUTION:_ Be sure no foreign material enters the final
gear case. _4. Install the oil filler bolt, and then tighten it to
the specified torque.
Tightening torque:
Final gear oil filler bolt:
23 Nm (2.3 m·kgf)
U1C160.book Page 33 Wednesday, May 12, 2004 4:55 PM

8-65
Observe these precautions:

When checking the brake fluid level, make sure
the top of the brake fluid reservoir is level.


Use only the designated quality brake fluid, oth-
erwise, the rubber seals may deteriorate, caus-
ing leakage and poor brake performance.


Refill with the same type of brake fluid. Mixing
fluids may result in a harmful chemical reaction
and lead to poor brake performance.


Be careful that water does not enter the brake
fluid reservoir when refilling. Water will signifi-
cantly lower the boiling point of the fluid and
may result in vapor lock.


Brake fluid may deteriorate painted surfaces or
plastic parts. Always clean up spilled fluid im-
mediately.


Have a Yamaha dealer check the cause if the
brake fluid level goes down. Recommended brake fluid: DOT 4
U1C160.book Page 65 Wednesday, May 12, 2004 4:55 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
U1C160.book Page 1 Wednesday, May 12, 2004 4:55 PM

10-2
10
Noise and vibration level:
Noise level (77/311/EEC) 87.1 dB (A)
Vibration on seat (EN1032, ISO5008) Will not exceed 0.5 m/s
2
Vibration on handlebar (EN1032, ISO5008) Will 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:
In order to prevent clutch slippage (since the en-
gine oil also lubricates the clutch), do not mix any
chemical additives. Do not use oils with a diesel
specification of “CD” or oils of a higher quality
than specified. In addition, do not use oils labeled
“ENERGY CONSERVING II” or higher.
U1C160.book Page 2 Wednesday, May 12, 2004 4:55 PM

10-3
Quantity:
Periodic oil change (engine oil): 2.40 L
Periodic oil change
(engine oil with oil filter replacement): 2.50 L
Periodic oil change
(engine oil and transfer gear oil with
oil filter replacement):2.8 L
Transfer gear case oil 0.3 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 element
Differential gear oil:
Type SAE 80 API GL-4 Hypoid gear oil
Quantity:
Periodic oil change 0.47 L
Total amount 0.50 LModel YFM400FP/YFM400FW
U1C160.book Page 3 Wednesday, May 12, 2004 4:55 PM

10-6
Suspension:
Front suspension Double wishbone
Rear suspension Swingarm (monocross)
Shock absorber:
Front shock absorber Coil spring / oil damper
Rear shock absorber Coil spring / oil damper
Wheel travel:
Front wheel travel 100.0 mm
Rear wheel travel 110.0 mm
Electrical:
Ignition system D.C. C.D.I.
Generator system A.C. magneto
Battery type YTX 20L-BS
Battery voltage, capacity 12 V, 18.0 Ah
Headlight type: Krypton bulb
Bulb voltage, wattage
× quantity:
Headlight 12 V, 30 W / 30.0 W
× 2
Tail / brake light 12 V, 5 W / 21.0 W × 1
Meter light 14 V, 3.0 W
× 1
Indicator light:
Neutral 12 V, 1.7 W
× 1
Reverse 12 V, 1.7 W × 1
Oil temperature 12 V, 1.7 W
× 1 Model YFM400FP/YFM400FW
U1C160.book Page 6 Wednesday, May 12, 2004 4:55 PM