2004 YAMAHA WOLVERINE 400 check engine

6-9
EBU00180
Starting a warm engine
To start a warm engine, refer to the “Starting a cold
engine” section. The starter (choke) should not be
used. The throttle should be opened slightly.
EBU00182
Warming up
To get maximum engine life, always warm up the
engine before starting off. Never accelerate hard
with a cold engine! To see whether or not the en-
gine is warm, check if it responds to the throttle
normally with the starter (choke) turned off.
U5TE61.book Page 9 Tuesday, May 6, 2003 4:40 PM

6-13 1. Drive select lever
a. F (Forward)
b. N (Neutral)
c. R (Reverse)
1. Levier de présélection
a. F (Marche avnt)
b. N (Point mort)
c. R (Marche arrière)
1. Palanca de selección de marcha
a. F (Marcha adelante)
b. N (Punto muerto)
c. R (Marcha atrás)
Shifting: reverse
1. Bring the machine to a complete stop and re-
turn the throttle lever to the closed position.
2. Apply the parking brake.
3. Shift the gear from neutral to reverse and vice
versa by moving the drive select lever along
the shift guide.NOTE:_ When in reverse, the reverse indicator light should
be on. If the light does not come on, ask a Yamaha
dealer to inspect the machine. _4. Check behind for people or obstacles, then
release the parking brake.
5. Open the throttle lever gradually and contin-
ue to watch to the rear while backing.NOTE:_ If the drive select lever is shifted into reverse while
the engine is running, the engine will stop unless
the parking brake or rear brake lever is applied. _
U5TE61.book Page 13 Tuesday, May 6, 2003 4:40 PM

8-7
EBU00262
PERIODIC MAINTENANCE/LUBRICATION
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
Valves*Check valve clearance.
Adjust if necessary.
Cooling systemCheck coolant leakage.
Repair if necessary.
Replace coolant every 24 months.Spark plugCheck condition.
Adjust gap and clean.
Replace if necessary.Air filter elementClean.
Replace if necessary.Every 20–40 hours
(More often in wet or dusty areas.)
Carburetor*Check and adjust idle speed/starter operation.
Adjust if necessary.Crankcase breather
system*Check breather hose for cracks or damage.
Replace if necessary.Exhaust system*Check for leakage.
Retighten if necessary.
Replace gasket(s) if necessary.Fuel line*Check fuel hose for cracks or damage.
Replace if necessary.Engine oil
Replace. (Warm engine before draining.)Engine oil filter cartridge
Replace.Engine oil strainer*
Clean.Final gear oil
Check oil level/oil leakage.
Replace every 12 months.Differential gear oil
Front brake*Check operation/fluid leakage. (See NOTE page 8-8.)
Correct if necessary.Rear brakeCheck operation.
Adjust if necessary.U5TE61.book Page 7 Tuesday, May 6, 2003 4:40 PM

8-29 1. Engine oil filler cap
1. Bouchon de remplissage d’huile de moteur
1. Tapa de relleno de aceite de motor
1. Maximum level mark 2. Minimum level mark
1. Repère de niveau maximum 2. Repère de niveau minimum
1. Marca de nivel máximo 2. Marca de nivel mínimo
EBU10991
Engine oil and oil filter cartridge
The engine oil level should be checked before
each ride. In addition, the oil must be changed and
the oil filter cartridge replaced at the intervals
specified in the periodic maintenance and lubrica-
tion chart.
To check the engine oil level
1. Remove panel F. (See page 8-27 for panel
removal and installation procedures.)
2. Place the ATV on a level surface.
3. Start the engine, warm it up for several min-
utes, and then turn it off.
4. Wait a few minutes until the oil settles.
5. Remove the engine oil filler cap and wipe off
the dipstick with a clean rag.
6. Insert the dipstick in the oil filler hole (without
screwing it in), and then remove it again to
check the oil level.NOTE:_ The engine oil should be between the minimum
and maximum level marks. _
U5TE61.book Page 29 Tuesday, May 6, 2003 4:40 PM

8-39
‘1. Final gear oil
2. Final gear oil filler bolt
3. Proper oil level
1. Huile de transmission finale
2. Boulon de remplissage d’huile du carter de transmission finale
3. Niveau correct
1. Aceite de la transmisión final
2. Perno del orificio de llenado de aceite de la transmisión final
3. Nivel de aceite adecuado
12. Start the engine and warm it up for several
minutes. While warming up, check for oil
leakage. If oil leakage is found, turn the en-
gine off immediately and check for the cause.
13. Turn the engine off, and then check the oil
level and correct it if necessary.
14. Install panel F.
EBU01145
Final gear oil
Final gear oil measurement
1. Place the machine 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.
U5TE61.book Page 39 Tuesday, May 6, 2003 4:40 PM

8-51 1. Coolant reservoir cap
2. Maximum level mark
3. Minimum level mark
1. Bouchon du vase d’expansion
2. Repère de niveau maximum
3. Repère de niveau minimum
1. Tapa del depósito de refrigerante
2. Marca de nivel máximo
3. Marca de nivel mínimo
EBU13210
Cooling system
1. Place the ATV on a level surface.
2. Check the coolant level in the coolant reser-
voir when the engine is cold as the coolant
level will vary with engine temperature.NOTE:_ The coolant level should be between the minimum
and maximum level marks. _3. If the coolant is at or below the minimum level
mark, remove panel D. (See pages 8-17–
8-19 for panel removal and installation proce-
dures.)
U5TE61.book Page 51 Tuesday, May 6, 2003 4:40 PM

8-61 1. Axle boot (× 2 each side)
1. Soufflet d’axe (× 2 de chaque côté)
1. Guardapolvo de eje (× 2 en cada lado)
14. Start the engine and let it idle for several min-
utes. Stop the engine, and then check the
coolant level in the radiator. If it is low, add
more coolant until it reaches the top of the ra-
diator.
15. Check for coolant leakage.NOTE:_ If any leakage is found, ask a Yamaha dealer to in-
spect the cooling system. _16. Install the panels and the front carrier.
EBU00862
Axle boots
Check the protective boots for holes or tears. If any
damage is found, have them replaced by a
Yamaha dealer.
U5TE61.book Page 61 Tuesday, May 6, 2003 4:40 PM

8-75
NOTE:_ The air filter element should be cleaned every 20–
40 hours. It should be cleaned and lubricated more
often if the machine is operated in extremely dusty
areas. Each time the air filter element mainte-
nance is performed, check the air inlet to the filter
case for obstructions. Check the air filter case rub-
ber joint to the carburetor and manifold fittings for
an airtight seal. Tighten all fittings securely to
avoid the possibility of unfiltered air entering the
engine. _CAUTION:_ Never operate the engine with the air filter ele-
ment removed. This will allow unfiltered air to
enter, causing rapid engine wear and possible
engine damage. Additionally, operation with-
out the air filter element will affect carburetor
jetting with subsequent poor performance and
possible engine overheating. _
U5TE61.book Page 75 Tuesday, May 6, 2003 4:40 PM