2001 YAMAHA YFM400F oil

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Differential gear oil
Make sure the differential gear oil is at the
specified level. Add oil as necessary. (See pag-
es 8-47 ~ 8-51 for details.)
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Throttle lever
Check to see that the throttle lever operates
correctly. It must open smoothly and spring
back to idle position when released. Repair as
necessary for proper operation.
EBU00152
Fittings and Fasteners
Always check the tightness of chassis fittings
and fasteners before a ride. Take the machine
to a Yamaha dealer or refer to the Service Man-
ual for correct tightening torque.Recommended oil:
SAE 80 API GL-4 Hypoid gear oil

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a. Starter (choke) lever
1. Fully open
2. Half open
3. Closed
a. Starter (enrichisseur)
1. Complètement ouvert
2. Mi-ouvert
3. Fermé
a. Palanca de starter (choke)
1. Abre completamente
2. Semiabierto
3. Cerrado
NOTE:

l
If the engine fails to start, release the start
switch, 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 sec-
onds on each attempt.
l
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 engine. If the engine is started with
the starter (choke) in position
2
, keep the
starter (choke) in this position to warm up
the engine.
8. Continue warming up the engine until it
idles smoothly and return the starter
(choke) to position
3
before riding.
CAUTION:

See the “Engine break-in” section prior to op-
erating the engine for the first time.

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PERIODIC MAINTENANCE/LUBRICATION
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year
Valves*

• Check valve clearance.
• Adjust if necessary.
Cooling system
• Check coolant leakage.
• Repair if necessary.
• Replace coolant every 24 months.
Spark plug
• Check condition.
• Adjust gap and clean.
• Replace if necessary.
Air filter
• Clean.
• Replace if necessary.Every 20~40 hours
(More often in wet or dusty areas.)
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.

Carburetor*

• Check and adjust idle speed/starter operation.
• Adjust 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 brake*

• Check operation/fluid leakage/see NOTE page 8-8.
• Correct if necessary.

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* It is recommended that these items be serviced by a Yamaha dealer.NOTE:

Recommended brake fluid: DOT 4
Brake fluid replacement:
1. When disassembling the master cylinder or caliper cylinder, replace the brake fluid. Normally
check the brake fluid level and add fluid as required.
2. On the inner parts of the master cylinder and caliper cylinder, replace the oil seals every two
years.
3. Replace the brake hoses every four years, or if cracked or damaged.
V-belt*

• Check operation.
• Check for cracks or damage every 12 months or
2,400 km whichever comes first.

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.

Front axle boots*
• Check operation.
• Replace if damaged.
Fittings and Fasteners*
• Check all chassis fittings and fasteners.
• Correct if necessary.
ITEM ROUTINEINITIAL EVERY
1
month3
months6
months6
months1
year

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Engine oil
Oil level inspection
1. Place the machine on a level place and
warm up the engine for several minutes.
2. Stop the engine.
3. Remove the dipstick and 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 be-fore checking.
4. The oil level should be between the maxi-
mum and minimum marks. If the level is
low, fill the engine with sufficient oil to
reach the specified level.
1. Engine oil dipstick
1. Jauge d’huile
1. Varilla de medición del aceite de motor1. 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

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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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5. Remove the oil filter by using an oil filter
wrench.NOTE:An oil filter wrench is available at a nearbyYamaha dealer.
6. Install the drain bolt and tighten it to the
specified torque.
Tightening torque:
Drain bolt:
32 Nm (3.2 m·kg)
1. Oil filter element
1. Élément de filtre à huile
1. Elemento del filtro de aceite1. Oil filter wrench
1. Clé pour filtre à huile
1. Llave para filtros 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