2003 YAMAHA WARRIOR 350 check engine

8-15 1. Dipstick 2. Maximum level mark
3. Minimum level mark
1. Jauge 2. Repère de niveau maximum
3. Repère de niveau minimum
1. Varilla 2. Marca de nivel máximo
3. Marca de nivel mínimo
EBU00949*
Engine oil
Engine oil level measurement
1. Place the machine on a level surface.
2. Warm up the engine for several minutes, and
then stop it.
3. Remove the dipstick, and then wipe it off with
a clean rag. Insert the dipstick in the filler hole
without screwing it in.NOTE:_ Wait a few minutes until the oil level settles before
checking. _4. Remove the dipstick, and then check the oil
level.
5. The oil level should be between the maxi-
mum and minimum marks. If the level is low,
add oil to raise it to the proper level.CAUTION:_ Be sure no foreign material enters the crank-
case. _
U5NF61.book Page 15 Wednesday, June 13, 2001 5:18 PM

8-19 1. Oil filter cover 2. Bolt (× 3)
3. Oil filter 4. O-ring
1. Couvercle du filtre à huile 2. Boulon (× 3)
3. Filtre à huile 4. Joint torique
1. Tapa del filtro de aceite 2. Perno (× 3)
3. Filtro de aceite 4. Junta tórica
5. Remove the oil filter cover by removing the
bolts and then remove the oil filter element.
6. Clean the oil strainer and oil filter element
with solvent.
7. Check the O-ring for damage and replace it if
damaged.
8. Install the oil filter element, and O-ring.
9. Install the oil filter cover by installing the bolts.
10. Install the oil strainer, compression spring
and drain bolt. Tighten the drain bolt and oil
filter cover bolts to the specified torques.CAUTION:_ Before installing the drain bolt, be sure to in-
stall the O-ring, compression spring and oil
strainer. _11. Fill the engine with oil, and then install the
dipstick. Tightening torques:
Drain bolt (engine):
32 Nm (3.2 m·kgf)
Filter cover bolt:
10 Nm (1.0 m·kgf)
U5NF61.book Page 19 Wednesday, June 13, 2001 5:18 PM

8-21
CAUTION:
Be sure no foreign material enters the crank-
case. 12. Warm up the engine for several minutes at
idle speed. Check for oil leakage while warm-
ing 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:
2.4 L
With oil filter replacement:
2.5 L
Total amount:
3.2 L
U5NF61.book Page 21 Wednesday, June 13, 2001 5:18 PM

8-23 1. Oil gallery bolt
1. Boulon de rampe de graissage
1. Perno del conducto de aceite
Oil pressure check
1. Put a cloth around the cylinder.
2. Slightly loosen the oil gallery bolt in the cylin-
der head.
3. Start the engine and keep it idling until oil be-
gins to seep from the oil gallery. If no oil
comes out after one minute, turn the engine
off so it will not seize and find the cause.
4. Start the engine, and then check the oil pres-
sure.
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·kgf)
U5NF61.book Page 23 Wednesday, June 13, 2001 5:18 PM

8-29 1. Check hose
1. Flexible de contrôle
1. Manguito de comprobación
1. Air filter case cover
2. Screw (× 5)
1. Couvercle du boîtier de filtre à air
2. Vis (× 5)
1. Tapa de la caja del filtro de aire
2. Tornillo (× 5)
EBU00950
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 element and air fil-
ter case. _1. Remove the seat.
2. Remove the air filter case cover by removing
the screws.
3. Remove the air filter element, and separate 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 element
because the engine could catch fire or explode. _5. Squeeze the excess solvent out of the air fil-
ter element and let it dry.CAUTION:_ Do not twist the air filter element when squeez-
ing it. _
U5NF61.book Page 29 Wednesday, June 13, 2001 5:18 PM

8-31 1. Unlock
1. Déverrouiller
1. Levántelo
1. Element retaining plate 2. Guide
3. Air filter element
1. Plaquette de retenue d’élément 2. Guide
3.Élément du filtre à air
1. Placa de retención del elemento 2. Guía
3. Elemento del filtro de air
6. Inspect the air filter element. If damaged, re-
place it.
7. Apply SAE 10W30 motor oil to the air filter el-
ement.NOTE:_ The element should be wet but not dripping. _8. Apply all-purpose grease to the air filter ele-
ment seat.
9. Install the air filter element on the guide.
10. Install the air filter element assembly and
parts removed for access.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 air 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 manifold fittings for an airtight
seal. Tighten all fittings securely to avoid the pos-
sibility of unfiltered air entering the engine.
U5NF61.book Page 31 Wednesday, June 13, 2001 5:18 PM

8-99
EBU00440*
Troubleshooting chart1. Fuel
Check if there is fuel
in the fuel tank.There is fuel.Turn the fuel
cock to “OFF”.No fuel.Fuel cock
clogged.
Clean fuel
cock. Some fuel.Turn the fuel
cock to “RES”.Restart engine.
No fuel.Supply fuel.
2. Compression
Use the electric starter
to see if there is
compression.There is compression.
Compression normal.
No compression.Ask a Yamaha dealer to
inspect.
3. Ignition
Remove plug and
check electrodes.WetWipe clean with dry cloth.
DryAttach plug cap and
ground to chassis.Use the
electric starter.Spark good.Ignition system
normal.
Spark weak.
Adjust plug gap
or replace plug. No spark.
Ask a Yamaha dealer to
inspect. 4. Battery
Use the electric
starter.Engine turns over
quickly.Battery good.
Engine turns over
slowly.Check fluid, recharge,
check connections.Check fuel
flow.
Turn the fuel
cock to “ON”.
Remove the
fuel hose.
U5NF61.book Page 99 Wednesday, June 13, 2001 5:18 PM