2006 YAMAHA YFZ450 crankcase

5-17
EBU10842
Engine oil
Make sure the engine oil is at the specified level.
Add oil as necessary. (See page 8-25.)
cC
8In order to prevent clutch slippage (since
the engine oil also lubricates the clutch),
do not mix any chemical additives. Do not
use oils with a diesel specification of “CD”
or oils of a higher quality than specified. In
addition, do not use oils labeled “ENERGY
CONSERVING II” or higher.
8Make sure that no foreign material enters
the crankcase.
Recommended engine oil type and quantity:
See page 10-2.
5TG-9-62 5-6 5/13/05 1:45 PM Page 5-17

8-7
EBU02622
PERIODIC MAINTENANCE/LUBRICATION
NOTE:8For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals.
8For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance intervals. However, keep in mind
that if the ATV isn’t used for a long period of time, the month maintenance intervals should be followed.
8Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical skills.
INITIAL EVERY
month 1 3 6 6 12
ITEM ROUTINEWhichever
km 320 1200 2400 2400 4800 comes first
(mi) (200) (750) (1500) (1500) (3000)
hours 20 75 150 150 300
Fuel line*9Check fuel hose for cracks or damage.
222
9Replace if necessary.
9Check condition.
Spark plug9Adjust gap and clean.22222
9Replace if necessary.
Valves*9Check valve clearance.
2 222
9Adjust if necessary.
Carburetor*9Check starter (choke) operation.
2222
9Adjust engine idle speed.
Crankcase breather9Check breather hose for cracks or damage.
222
system*9Replace if necessary.
9Check for leakage.
Exhaust system*9Tighten if necessary.222
9Replace gasket if necessary.
5TG-9-62 8 5/13/05 1:48 PM Page 8-7

8-31
4. Remove the engine oil filler cap and the
crankcase engine oil drain bolt.
5. Remove the engine oil tank filler cap and
the engine oil tank drain bolt.
6. Check the washers for damage, and
replace if necessary.
1. Crankcase engine oil drain bolt1. Boulon de vidange d’huile du carter1. Perno de drenaje de aceite de motor del cárter
1. Engine oil tank drain bolt
1. Boulon de vidange du réservoir d’huile1. Perno de drenaje del depósito aceite de motor
5TG-9-62 8 5/13/05 1:48 PM Page 8-31

8-35
11. Install the crankcase engine oil drain bolt
and the engine oil tank drain bolt, and then
tighten them to the specified torques.
12. Pour the specified amount of recommend-
ed engine oil through the engine oil tank
filler hole, insert the dipstick, and then
tighten the engine oil tank filler cap.
13. Pour the specified amount of recommend-
ed engine oil through the engine oil filler
hole, and then install and tighten the
engine oil filler cap.
Tightening torque:
Oil filter element cover bolt:
10 Nm (1.0 m0kgf)
Tightening torques:
Crankcase engine oil drain bolt:
20 Nm (2.0 m0kgf)
Engine oil tank drain bolt:
19 Nm (1.9 m0kgf)
5TG-9-62 8 5/13/05 1:48 PM Page 8-35

8-37
Recommended engine oil:
See page 10-2.
Oil quantity:
Without oil filter element replacement:
Quantity in oil tank:
1.55 L
Quantity in crankcase:
0.20 L
Total amount:
1.75 L
With oil filter element replacement:
Quantity in oil tank:
1.55 L
Quantity in crankcase:
0.30 L
Total amount:
1.85 L
5TG-9-62 8 5/13/05 1:48 PM Page 8-37

8-39
cC
8In order to prevent clutch slippage (since
the engine oil also lubricates the clutch),
do not mix any chemical additives. Do not
use oils with a diesel specification of “CD”
or oils of a higher quality than specified. In
addition, do not use oils labeled “ENERGY
CONSERVING II” or higher.
8Make sure that no foreign material enters
the crankcase.
14. Start the engine, and then let it idle for sev-
eral minutes while checking it for oil leak-
age. If oil is leaking, immediately turn the
engine off and check for the cause.
15. Turn the engine off, and then check the oil
level and correct it if necessary.
16. Install the engine guard by installing the
bolts, and then tighten them to the speci-
fied torque.
5TG-9-62 8 5/13/05 1:48 PM Page 8-39

8-103
EBU14210
Clutch lever free play adjustment
The clutch lever free play should be adjusted to
8–13 mm.
1. Fully turn the adjusting nut at the clutch
lever in direction ato increase the free
play or in direction bto decrease the free
play.
If the specified free play cannot be obtained,
proceed with the following steps.
2. Turn the adjusting nut at the clutch lever in
direction ato loosen the cable.
3. Loosen the locknut at the crankcase side.
4. Turn the adjusting nut at the crankcase in
direction ato increase the free play or in
direction bto decrease the free play.
5. Tighten the locknut at the crankcase side.
1. Adjusting nut c. Cluch lever free play1. Écrou de réglage c. Jeu du levier d’embrayage1. Tuerca de ajuste
c. Juego libre de la palanca del embrague
1. Locknut 2. Adjusting nut
1. Contre-écrou 2. Écrou de réglage1. Tuerca de bloqueo 2. Tuerca de adjuste
5TG-9-62 9-11 5/12/05 6:14 PM Page 8-103