2001 YAMAHA WARRIOR 350 engine

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1. Oil filter cover 2. Oil filter
3. O-ring
1. Couvercle du filtre à huile 2. Filtre à huile
3. Joint torique
1. Tapa del filtro de aceite 2. Filtro de aceite
3. Junta tórica
5. Remove the oil filter cover and oil filter.
6. Clean the oil strainer and oil filter with sol-
vent.
7. Check the O-ring for damage and replace
it if necessary.
8. Install the oil filter, O-ring, oil filter cover,
oil strainer, compression spring and drain
bolt. Tighten the drain bolt to the specified
torque.
CAUTION:

Before installing the drain bolt, be sure to in-
stall the O-ring, compression spring and oil
strainer.
9. Fill the engine with oil, and then install the
dipstick. Tightening torque:
Drain bolt (engine):
32 Nm (3.2 m·kg)
Filter cover bolt:
10 Nm (1.0 m·kg)

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CAUTION:

Be sure no foreign material enters the crank-
case.
10. Warm up the engine for several minutes
at idle speed. Check for oil leakage while
warming up.
CAUTION:

If oil leakage is found, stop the engine immedi-
ately and check for the cause.
Recommended oil:
See page 10-2.
Oil quantity:
Periodic oil change:
2.4L
With oil filter replacement:
2.5 L
Total amount:
3.2 L

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Oil pressure check
1. Put a cloth around the cylinder.
2. Slightly loosen the oil gallery bolt in the
cylinder head.
3. Start the engine and keep it idling until oil
begins to seep from the oil gallery. If no oil
comes out after one minute, turn the en-
gine off so it will not seize and find the
cause.
4. Start the engine, and then check the oil
pressure.
5. After checking, tighten the oil gallery bolt
to the specified torque.CAUTION:Be sure to check the oil pressure after replac-ing the engine oil. Tightening torque:
Oil gallery bolt:
7 Nm (0.7 m·kg)
1. Oil gallery bolt
1. Boulon de rampe de graissage
1. Perno del conducto de aceite

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EBU00286
Spark plug inspection
The spark plug is an important engine compo-
nent and is easy to inspect. The condition of
the spark plug can indicate the condition of the
engine.
For example, a very white center electrode por-
celain color could indicate an intake air leak or
carburetion problem for that cylinder. Do not
attempt to diagnose such problems yourself.
Instead, take the machine to a Yamaha dealer.
You should periodically remove and inspect
the spark plug because heat and deposits will
cause the spark plug to slowly break down and
erode. If electrode erosion becomes excessive,
you should replace the spark plug with one of
the proper type.
Standard spark plug:
DR8EA (NGK)

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EBU00291
Air filter cleaningNOTE:There is a check hose at the bottom of the air
filter case. If dust or water collects in this hose,
empty the hose and clean the air filter elementand air filter case.
1. Remove the seat.
2. Remove the air filter case cover.
3. Remove the air filter element, and sepa-
rate 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 elementbecause the engine could catch fire or explode.
5. Squeeze the excess solvent out of the fil-
ter and let it dry.CAUTION:Do not twist the filter element when squeez-ing it.
1. Air filter case cover
1. Couvercle du boîtier de filtre à air
1. Tapa de la caja del filtro1. Check hose
1. Flexible de contrôle
1. Manguito de comprobación

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6. Inspect the element. If damaged, replace
it.
7. Apply SAE 10W30 motor oil to the ele-
ment.NOTE:The element should be wet but not dripping.
8. Apply all-purpose grease to the air filter
element seat.
9. Reinstall the element to the element
guide.
10. Reinstall the element assembly and parts
removed for access.NOTE:The air filter element should be cleaned every
20 ~ 40 hours. It should be cleaned and lubri-
cated more often if the machine is operated in
extremely dusty areas. Each time filter element
maintenance is performed, check the air inlet
to the filter case for obstructions. Check the air
cleaner rubber joint to the carburetor and man-
ifold fittings for an airtight seal. Tighten all fit-
tings securely to avoid the possibility ofunfiltered air entering the engine.
1. Unlock
1. Déverrouiller
1. Levántelo1. Element retaining plate 2. Guide
3. Air filter element
1. Plaquette de retenue d’élément 2. Guide
3. Élément du filtre à air
1. Element plate 2. Guía
3. Elemento filtrante

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CAUTION:Never operate the engine with the air filter el-
ement removed. This will allow unfiltered air
to enter, causing rapid engine wear and possi-
ble engine damage. Additionally, operation
without the filter element will affect carbure-
tor jetting with subsequent poor performanceand possible engine overheating.
EBU00296
Carburetor adjustment
The carburetor is a vital part of the engine and
requires very sophisticated adjustment. Most
adjusting should be left to a Yamaha dealer
who has the professional knowledge and expe-
rience to do so. However, the idling speed may
be performed by the owner as a part of the
usual maintenance routine.CAUTION:The carburetor was set at the Yamaha factory
after many tests. If the settings are disturbed
by someone without sufficient technical
knowledge, poor engine performance anddamage may result.

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1. Throttle stop screw
1. Vis de butée de papillon
1. Tornillo de tope del acelerador
EBU00301
Idle speed adjustmentNOTE:A diagnostic tachometer must be used for thisprocedure.
1. Start the engine and warm it up for a few
minutes at approximately 1,000 to
2,000 r/min. Occasionally rev the engine
to 4,000 to 5,000 r/min. The engine is
warm when it quickly responds to the
throttle.
2. Connect the tachometer and set the idle to
the specified idling speed by adjusting the
throttle stop screw. Turn the screw in to
increase engine speed, and out to de-
crease engine speed.
Specified idle speed:
1,450 ~ 1,550 r/min