2001 YAMAHA YFM400F check engine

Yuki_Data:Yuki_data:Yuki:Yuki_1:ATV:HM00B061_YFM400FWA-61:YFM600TOC-
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CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS ....................... 1-1
SAFETY INFORMATION ........................ 2-1
DESCRIPTION AND MACHINE
IDENTIFICATION .................................... 3-1
Identification number records ........... 3-3
Key identification number ................. 3-5
Vehicle identification number ........... 3-5
Model label ......................................... 3-7
CONTROL FUNCTIONS ......................... 4-1
Main switch......................................... 4-1
Indicator lights .................................... 4-3
Coolant temperature indicator light
checking method .............................. 4-7
Speedometer .................................... 4-11
Fuel gauge ........................................ 4-13
Handlebar switches .......................... 4-15
Throttle lever .................................... 4-21
Speed limiter .................................... 4-23
Front brake lever .............................. 4-25Rear brake pedal and lever.............. 4-27
Drive select lever .............................. 4-29
Recoil starter..................................... 4-29
Fuel tank cap..................................... 4-31
Fuel cock ........................................... 4-33
Starter (choke) “ ” ........................ 4-35
Seat ................................................... 4-37
Storage box ...................................... 4-39
Front carrier ...................................... 4-39
Rear carrier ....................................... 4-39
Front shock absorber
adjustment...................................... 4-41
Rear shock absorber
adjustment...................................... 4-45
Auxiliary DC jack .............................. 4-49
PRE-OPERATION CHECKS .................... 5-1
Front and rear brakes......................... 5-7
Fuel .................................................... 5-11
Engine oil .......................................... 5-15
Final gear oil ..................................... 5-19
Differential gear oil .......................... 5-21
Throttle lever .................................... 5-21
Fittings and Fasteners...................... 5-21
1234
5

3-1
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DESCRIPTION AND MACHINE
IDENTIFICATION
1. Rear spring preload
adjusting ring
2. Storage box and tool kit
3. Spark plug
4. Rear brake fluid
reservoir
5. Radiator cap
6. Front spring preload
adjusting ring
7. V-belt case
8. Rear brake pedal
9. Front spring preload
adjusting ring
10. Fuel cock
11. Air filter case
12. Fuses13. V-belt cooling duct
check hose
14. Coolant reservoir
15. Oil filter cartridge
16. Engine oil dipstick
17. Rear brake lever
18. Left handlebar switches
19. Starter (choke)
20. Horn switch
21. Drive select lever
22. Speedometer
23. Main switch
24. Fuel tank cap
25. Auxiliary DC jack
26. Right handlebar switch
27. Throttle lever
28. Front brake lever
NOTE:

The machine you have purchased may differ
slightly from those shown in the figures of this
manual.

4-5
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The coolant temperature warning light circuit
can be checked according to the procedure on
page 4-7.
CAUTION:

l
The engine may overheat if the ATV is
overloaded. If this happens, reduce the
load to specification.
l
Restart after making sure that the light is
out. Continuous use while the light is on
may cause damage to the engine.
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Four-wheel-drive indicator light “ ”
This indicator light comes on when the
2WD/4WD switch is in the 4WD position.
NOTE:

Due to the synchronizing mechanism in the dif-
ferential gear case, the light may not come on
until the ATV starts moving.

4-7
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Coolant temperature warning light checking method
ACB-09E
Turn the main switch to “ON” and
the engine stop switch to “ ”.
Coolant temperature warning
light does not come on.
Coolant temperature
warning light comes on.
Coolant temperature
warning light does
not come on.
Coolant temperature and
electrical circuit are OK.
Go ahead with riding.
Push the start switch with the
transmission in the neutral position.
Ask a Yamaha dealer to
inspect the electrical circuit.
Coolant temperature
warning light comes
on momentarily.

4-21
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Throttle lever
Once the engine is running, movement of the
throttle lever will increase the engine speed.
Regulate the speed of the machine by varying
the throttle position. Because the throttle is
spring-loaded, the machine will decelerate,
and the engine will return to an idle any time
the hand is removed from the throttle lever.
Before starting the engine, check the throttle to
be sure it is operating smoothly. Make sure it
returns to the idle position as soon as the lever
is released.
WARNING

Malfunction of the throttle could make it diffi-
cult to speed up or slow down when you need
to. This could cause an accident. Check the op-
eration of the throttle lever before you start
the engine. If the throttle does not work
smoothly, check for the cause. Correct the
problem before riding the ATV or consult a
Yamaha dealer.
1. Throttle lever
1. Levier d’accélération
1. Palanca de aceleración

5-1
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PRE-OPERATION CHECKS
Before using this machine, check the following points:
ITEM ROUTINE PAGE
Brakes
• Check operation, free play, fluid level and fluid leakage.
• Fill with DOT 4 brake fluid if necessary.5-7 ~ 5-9,
8-91 ~ 8-95
Fuel
• Check fuel level.
• Fill with fuel if necessary.5-11 ~ 5-13
Engine oil
• Check oil level.
• Fill with oil if necessary.5-15 ~ 5-17,
8-31 ~ 8-41
Coolant reservoir
• Check coolant level.
• Fill with coolant if necessary.8-53 ~ 8-63
Final gear oil/
Differential gear oil
• Check for leakage. 5-19, 8-41 ~ 8-51
Throttle
• Check for proper throttle cable operation. 5-21, 8-87
Wheels and tires
• Check tire pressure, wear and damage.5-25 ~ 5-31,
8-107 ~ 8-109
Fittings and Fasteners
• Check all fittings and fasteners. 5-21
Lights
• Check for proper operation. 5-23, 8-121 ~ 8-127
Front axle boots
• Check for damage. 8-63

5-23
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Lights
Check the headlight and taillight to make sure
they are in working condition. Repair as neces-
sary for proper operation.
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Switches
Check the operation of the headlight switch,
engine stop switch and any other switches. Re-
pair as necessary for proper operation.

6-9
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Starting a warm engine
To start a warm engine, refer to the “Starting a
cold engine” section. The starter (choke)
should not be used. The throttle should be
opened slightly.
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Warming up
To get maximum engine life, always warm up
the engine before starting off. Never accelerate
hard with a cold engine! To see whether or not
the engine is warm, check if it responds to the
throttle normally with the starter (choke)
turned off.