engine YAMAHA YFM400F 2001 Service Manual

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Engine oil and oil filter cartridge replacement
1. Remove panels E and F. (See pages 8-27 ~
8-29 for removal and installation proce-
dures.)
2. Warm up the engine for several minutes.
3. Stop the engine. Place an oil pan under
the engine and remove the dipstick.
4. Remove the drain bolt and drain the oil.
1. Engine oil drain bolt
2. Oil strainer
1. Boulon de vidange de l’huile
2. Crépine à huile
1. Perno de drenaje del aceite de motor
2. Colador de aceite

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7. Apply a light coat of engine oil to the
O-ring of the new oil filter.NOTE:Make sure the O-ring is seated properly.
8. Install the oil filter and tighten it to the
specified torque with an oil filter wrench.
Tightening torque:
Oil filter:
17 Nm (1.7 m·kg)
1. Torque wrench
1. Clé dynamométrique
1. Llave de apriete

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9. Fill the engine with sufficient oil to reach
the specified level. Install the dipstick and
tighten it.CAUTION:l
Do not put in any chemical additives. En-
gine oil also lubricates the clutch and ad-
ditives could cause clutch slippage.
l
Be sure no foreign material enters thecrankcase. Recommended oil:
See page 10-2.
Oil quantity:
Total amount:
2.6 L
Periodic oil change:
2.3 L
With oil filter replacement:
2.4 L

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10. Start the engine and warm it up for sever-
al minutes. While warming up, check for
oil leakage. If oil leakage is found, stop the
engine immediately and check for the
cause.
11. Install the panels.
EBU00705
Final gear oil
Final gear oil measurement
1. Place the machine on a level place.
2. Remove the oil filler bolt and check the oil
level. It should be up to the brim of the
hole. If the level is low, add oil to raise it to
the proper level.CAUTION:Be sure no foreign material enters the finalgear case.
1. Final gear oil
2. Final gear case filler bolt
3. Proper level
1. Huile de transmission finale
2. Boulon de remplissage du carter de transmission finale
3. Niveau correct
1. Aceite de la transmisión final
2. Tapa de la caja del filtro
3. Nivel adecuado

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EBU00703
Cooling system
1. Check the coolant level in the reservoir
tank when the engine is cold as the cool-
ant level will vary with engine tempera-
ture. The coolant level should be between
the maximum and minimum marks.
2. If the level is low, remove panel D. (See
pages 8-17 ~ 8-19 for panel removal and
installation procedures.)
1. Coolant reservoir tank 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

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EBU00679
Changing the coolant
WARNING
Wait for the engine and radiator to cool before
removing the radiator cap. You could be
burned by hot fluid and steam blown out un-
der pressure. Always put a thick rag over the
cap when opening. Allow any remaining pres-
sure to escape before completely removingthe cap.
1. Put the ATV on a level place.
2. Remove panels E and F. (See pages 8-27 ~
8-29 for removal and installation proce-
dures.)
3. Place a container under the engine and re-
move the coolant drain bolt. (Use a trough
or a similar object as shown to prevent
coolant from spilling on the footrest.)
4. Remove the front carrier and panel C. (See
pages 8-23 and 8-25 for removal and in-
stallation procedures.)
1. Trough
1. Feuille de papier repliée en forme de conduit
1. Pasante1. Coolant drain bolt
1. Boulon de vidange du liquide de refroidissement
1. Perno de drenaje del refrigerante

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10. Install the reservoir tank hose.
11. Pour the recommended coolant into the
radiator until it is full.CAUTION:Hard water or salt water is harmful to the en-
gine. You may use distilled water if you can’tget soft water. Recommended antifreeze:
High quality ethylene glycol antifreeze
containing corrosion inhibitors for alumi-
num engines.
Antifreeze and water mixing ratio:
1:1
Total amount:
1.1 L
Reservoir tank capacity:
0.25 L

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12. Install the radiator cap.
13. Run the engine several minutes. Stop the
engine and recheck the coolant level in
the radiator. If it is low, add more coolant
until it reaches the top of the radiator.
14. Fill the reservoir tank with coolant up to
maximum level.
15.Install the reservoir tank cap and check for
coolant leakage.NOTE:If any leakage is found, ask a Yamaha dealer toinspect the cooling system.
16. Install the panel and the front carrier.
EBU00283
Front axle boots
Check the protective boots for holes or tears. If
any damage is found, have them replaced by a
Yamaha dealer.
1. Front axle boot (´ 2 each side)
1. Soufflet d’axe avant (´ 2 de chaque côté)
1. Guardapolvo de eje delantero (´ 2 en cada lado)

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EBU00680
Spark plug inspection
Removal
1. Remove the spark plug cap.
2. Use the spark plug wrench in the tool kit
to remove the spark plug as shown.
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.
The ideal color on the white insulator around
the center electrode is a medium-to-light tan
color for a ATV that is being ridden normally.
1. Spark plug wrench
1. Clé à bougie
1. Llave de bujía1. Spark plug cap
1. Capuchon de bougie
1. Tapa de bujía

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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
solvents or gasoline to clean the air filter ele-
ment because the engine could catch fire orexplode.
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.
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.
1. Air filter element
1. Élément de filtre à air
1. Elemento del filtro de aire1. Air filter guide
1. Guide de filtre à air
1. Filtro de aire guía