2003 YAMAHA BIG BEAR PRO 400 engine

4-33
EBU00095
Starter (choke) “”
Starting a cold engine requires a richer air-fuel
mixture. A separate starter circuit supplies this
mixture.
Move in direction
a to turn on the starter (choke).
Move in direction
b to turn off the starter (choke).
Refer to “Starting a cold engine” for proper opera-
tion. (See page 6-3.)
U4SH6A.book Page 33 Thursday, May 30, 2002 1:25 PM

4-43 1. Auxiliary DC jack 2. Cap
1. Prise pour accessoires 2. Capuchon
1. Toma de CC auxiliar 2. Tapa
EBU01002
Auxiliary DC jack
The auxiliary DC jack is located at the front right
side of the ATV. The auxiliary DC jack can be used
for suitable work lights, radios, etc. The auxiliary
DC jack should only be used when the engine is
running.
1. Set the light switch to “OFF”.
2. Start the engine. (See pages 6-3–6-9.)
3. Open the auxiliary DC jack cap, and then in-
sert the accessory power plug into the jack.
4. When the auxiliary DC jack is not being used,
cover it with the cap. Maximum rated capacity for the auxiliary
DC jack:
DC 12 V, 120 W (10 A)
U4SH6A.book Page 43 Thursday, May 30, 2002 1:25 PM

4-45
CAUTION:_

Do not use accessories requiring more
than the above maximum capacity. This
may overload the circuit and cause the
fuse to blow.


If accessories are used without the engine
running or with the headlights turned on,
the battery will lose its charge and engine
starting may become difficult.


Do not use an automotive cigarette lighter
or other accessories with a plug that gets
hot because the jack can be damaged.
_
U4SH6A.book Page 45 Thursday, May 30, 2002 1:25 PM

5-1
EBU00113
1-PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Front brakeCheck operation, free play, fluid level and fluid leakage.
Fill with DOT 4 brake fluid if necessary.5-5–5-7,
8-55–8-75
Rear brakeCheck operation, pedal height and free play.
FuelCheck fuel level.
Fill with fuel if necessary.5-9–5-11
Engine oil/
Transfer gear oilCheck oil level.
Fill with oil if necessary.5-13–5-15,
8-13–8-25
Final gear oil/
Differential gear oilCheck for leakage. 5-17, 8-27–8-35
ThrottleCheck for proper throttle cable operation. 5-17, 8-55
Wheels and tiresCheck tire pressure, wear and damage.5-21–5-27,
8-81–8-83
Fittings and FastenersCheck all fittings and fasteners. 5-19
LightsCheck for proper operation. 5-19, 8-91–8-95
Axle bootsCheck operation. 8-35
U4SH6A.book Page 1 Thursday, May 30, 2002 1:25 PM

5-11 1. Fuel level 2. Filler tube
1. Niveau de carburant 2. Tube de remplissage
1. Nivel de combustible 2. Tubo del relleno
CAUTION:_ Use only unleaded gasoline. The use of leaded
gasoline will cause severe damage to internal
engine parts, such as the valves and piston
rings, as well as to the exhaust system. _
WARNING
_

Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is over-
filled, fuel could spill out due to heat from
the engine or the sun.


Be careful not to spill fuel, especially on
the engine or exhaust pipe which can
cause a fire and severe injury. Wipe up any
spilled fuel immediately.


Do not refuel right after the engine has
been running and is still very hot.


Be sure the fuel tank cap is closed secure-
ly.
_
U4SH6A.book Page 11 Thursday, May 30, 2002 1:25 PM

5-13
EBU01234
Engine oil/transfer gear oil
Make sure the engine oil/transfer gear oil is at the
specified level. Add oil as necessary. (See pages
8-13–8-25.)
Recommended oil:
Recommended engine oil classification:
API Service SE, SF, SG type or higher
-20˚ -10˚ 0˚
10˚20˚ 30˚40˚50˚C
10W/30
15W/4020W/4020W/50
10W/40
5W/30
U4SH6A.book Page 13 Thursday, May 30, 2002 1:25 PM

5-15
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.
_
Oil quantity:
Periodic oil change
(engine oil):
2.4 L
Periodic oil change
(engine oil and transfer gear oil with oil
filter element replacement):
2.8 L
Total amount:
3.7 L
U4SH6A.book Page 15 Thursday, May 30, 2002 1:25 PM

6-3
EBU00505
Starting a cold engine
WARNING
Always make sure all control cables work
smoothly before you begin riding in cold
weather. If the control cables are frozen or do
not work smoothly, you could be unable to
control the ATV, which could lead to an acci-
dent or collision.1. Set the parking brake.
2. Turn the fuel cock to “ON”.
3. Turn the main switch to “ON” and the engine
stop switch to “”.
4. Shift the transmission into neutral.
U4SH6A.book Page 3 Thursday, May 30, 2002 1:25 PM