2004 YAMAHA WOLVERINE 350 oil

5-13
EBU10842
Engine oil
Make sure the engine oil is at the specified level.
Add oil as necessary. (See pages 8-19–8-29.)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 type and quantity:
See page 10-2.
U5UH60.book Page 13 Wednesday, October 8, 2003 9:05 AM

5-15
EBU00493
Final gear oil
Make sure the final gear oil is at the specified level.
Add oil as necessary. (See pages 8-29–8-33 for
details.)
If desired, an SAE 80W90 hypoid gear oil may be
used for all conditions.NOTE:GL-4 is a quality and additive rating, GL-5 or GL-6
rated hypoid gear oils may also be used.
Recommended oil:
SAE 80 API GL-4 Hypoid gear oil
U5UH60.book Page 15 Wednesday, October 8, 2003 9:05 AM

5-17
EBU00678
Differential gear oil
Make sure the differential gear oil is at the speci-
fied level. Add oil as necessary. (See pages 8-35–
8-39 for details.)
EBU01083
Throttle lever
Check to see that the throttle lever operates cor-
rectly. It must open smoothly and spring back to
the idle position when released. Have a Yamaha
dealer repair as necessary for proper operation.Recommended oil:
SAE 80 API GL-4 Hypoid gear oil
U5UH60.book Page 17 Wednesday, October 8, 2003 9:05 AM

6-7 a. Starter (choke)
1. Fully open
2. Half open
3. Closed
a. Starter (enrichisseur)
1. Complètement ouvert
2. Mi-ouvert
3. Fermé
a. Arrancador (choke)
1. Abre completamente
2. Semiabierto
3. Cerrado
NOTE:_

If the engine fails to start, release the start
switch, and then push the start switch again.
Pause a few seconds before the next at-
tempt. Each cranking should be as short as
possible to preserve battery energy. Do not
crank the engine more than 10 seconds on
each attempt.


If the battery is discharged, pull the recoil
starter to start the engine.
_7. If the engine is started with the starter (choke)
in position
1, the starter (choke) should be
returned to position
2 to warm up the en-
gine. If the engine is started with the starter
(choke) in position
2, keep the starter
(choke) in this position to warm up the en-
gine.
8. Continue warming up the engine until it idles
smoothly and return the starter (choke) to po-
sition
3 before riding.CAUTION:_ See the “Engine break-in” section prior to op-
erating the engine for the first time. _
U5UH60.book Page 7 Wednesday, October 8, 2003 9:05 AM

8-7
EBU00262
PERIODIC MAINTENANCE/LUBRICATION
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
Valves*Check valve clearance.
Adjust if necessary.
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.
Tighten 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.V-belt*Check operation.
Check for cracks or damage.U5UH60.book Page 7 Wednesday, October 8, 2003 9:05 AM

8-8
* Since these items require special tools, data and technical skills, have a Yamaha dealer perform the service.NOTE:

Recommended brake fluid: DOT 4


Brake fluid replacement:
When disassembling the master cylinder or caliper, replace the brake fluid. Normally check the
brake fluid level and add fluid as required.
On the inner parts of the master cylinder and caliper, replace the oil seals every two years.
Replace the brake hoses every four years, or if cracked or damaged.
Wheels*Check balance/damage/runout.
Repair if necessary.Wheel bearing*Check bearing assemblies for looseness/damage.
Replace if damaged.Front and rear
suspension*Check operation.
Correct if necessary.Steering system*Check operation./Replace if damaged.
Check toe-in./Adjust if necessary.Drive shaft universal
joint*Lubricate.Axle boots*Check operation.
Replace if damaged.Fittings and fasteners*Check all chassis fittings and fasteners.
Correct if necessary.Lights and switches*Check operation.
Adjust headlight beams.
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
U5UH60.book Page 8 Wednesday, October 8, 2003 9:05 AM

8-19 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
EBU14540
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. Place the ATV on a level surface.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Wait a few minutes until the oil settles.
4. Remove the engine oil filler cap and wipe off
the dipstick with a clean rag.
5. 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. _
U5UH60.book Page 19 Wednesday, October 8, 2003 9:05 AM

8-21 1. Engine oil drain bolt
1. Boulon de vidange de l’huile
1. Perno de drenaje del aceite de motor
6. 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.
7. Insert the dipstick into the oil filler hole, and
then tighten the oil filler cap.
To change the engine oil (with or without oil fil-
ter cartridge replacement)
1. Start the engine, warm it up for several min-
utes, and then turn it off.
2. Place an oil pan under the engine to collect
the used oil, and then remove the engine oil
filler cap.
3. Remove the engine oil drain bolt to drain the
oil from the crankcase.
U5UH60.book Page 21 Wednesday, October 8, 2003 9:05 AM