2005 YAMAHA YFZ450 radiator cap

3-1
EBU00320
1-DESCRIPTION AND MACHINE
IDENTIFICATION1. Seat
2. Fuel tank cap
3. Radiator cap
4. Oil filter element
5. Brake pedal
6. Headlights
7. Fuel cock
8. Starter (choke)
9. Throttle stop screw
10. Fuse11. Tail/brake light
12. Coolant reservoir
13. Shift pedal
14. Engine oil tank
15. Clutch lever
16. Handlebar switches
17. Parking brake lever
18. Main switch
19. Throttle lever
20. Brake leverNOTE:_ The machine you have purchased may differ
slightly from those shown in the figures of this
manual. _
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5-17
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 under
pressure. Always put a thick rag over the cap
when opening. Allow any remaining pressure
to escape before completely removing the cap. _
EBU04980
Chain
Check the general condition of the chain and
check the chain slack before every ride. Lubricate
and adjust the chain as necessary. (See pages
8-101–8-109 for details.)
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Throttle lever
Check to see that the throttle lever operates cor-
rectly. It must open smoothly and spring back to
the idle position when released. Have a Yamaha
dealer repair as necessary for proper operation.
U5TG61.book Page 17 Friday, April 2, 2004 11:28 AM

8-45 1. Coolant drain bolt 2. Trough
1. Boulon de vidange du liquide de refroidissement
2. Feuille de papier pliée comme illustré
1. Perno de drenaje de refrigerante
2. Elemento de paso
1. Radiator cap
1. Bouchon de radiateur
1. Tapa del radiador
EBU14130
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 under
pressure. Always put a thick rag over the cap
when opening. Allow any remaining pressure
to escape before completely removing the cap. _1. Place the ATV on a level surface.
2. Remove panel A. (See page 8-17 for panel
removal and installation procedures.)
3. Place a container under the engine, and then
remove the coolant drain bolt. (Use a trough
or a similar object as shown.)
4. Remove the radiator cap.
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8-51
CAUTION:_ Hard water or salt water is harmful to the en-
gine. You may use soft water if you cannot get
distilled water. _12. Install the radiator cap and the coolant reser-
voir cap.
13. Start the engine and let it idle for several min-
utes. Stop the engine, and then check the
coolant level in the radiator. If it is low, add
more coolant until it reaches the top of the ra-
diator.
14. Check the coolant level in the reservoir. If it is
low, add coolant to the maximum level mark.
15. Start the engine and then check for coolant
leakage.NOTE:_ If any leakage is found, have a Yamaha dealer
check the cooling system. _16. Install the panel.
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8-148
Engine overheatingNOTE:_ If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that it is
changed to the recommended coolant as soon as possible. _
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 under pressure. Always put a thick rag over the cap when opening.
Allow any remaining pressure to escape before completely removing the cap. _ Wait until the
engine has cooled.
Check the coolant level in the
coolant reservoir and/or radiator.
Level is OK.Level is low, check the
cooling system for leakage.
No
leakage.Leakage.
Ask a Yamaha dealer to inspect
and repair the cooling system.Add coolant. (See NOTE.)
Restart the engine. If the engine overheats again, ask a
Yamaha dealer to inspect and/or repair the cooling system.
U5TG61.book Page 148 Friday, April 2, 2004 11:28 AM

10-3
Radiator capacity (including all routes): 1.30 L
Air filter: Wet element
Fuel:
Type
Tank capacity
Reserve amountPREMIUM UNLEADED GASOLINE ONLY
For Europe:
PREMIUM UNLEADED GASOLINE ONLY with
a research octane number of 97 or higher
10.0 L
1.9 L
Carburetor:
Type
× quantity
ManufacturerFCR39H
× 1
KEIHIN
Spark plug:
Type/manufacturer
GapCR8E/NGK
0.7–0.8 mm
Clutch:
Type
OperationWet, multiple-disc
Left hand operation
Transmission:
Primary Reduction System
Primary Reduction Ratio
Secondary Reduction System
Secondary Reduction Ratio
Transmission type
OperationSpur gear
62/22 (2.818)
Chain drive
38/14 (2.714)
Constant mesh, 5-speed forward
Left foot operation MODEL YFZ450
U5TG61.book Page 3 Friday, April 2, 2004 11:28 AM