Yamaha YZ450FN 2022, Owner'S Service Manual, Page: 96 / 366

ENGINE
3-20
6. Check:
• Gasket “1”
Damage

Replace.
7. Check:
•
Tightening torques
8. Install:
•
Exhaust pipe protector
EAM30210
CHECKING THE COOLANT LEVEL
WARNING
EWA13030
A hot radiator is under pressure. Therefore,
do not remove the radiator cap when the en-
gine is hot. Scalding hot fluid and steam may
be blown out, which could cause serious in-
jury. When the engine has cooled, open the
radiator cap as follows:
Place a thick rag or a towel over the radiator
cap and slowly turn the radiator cap counter-
clockwise toward the detent to allow any re-
sidual pressure to escape. When the hissing
sound has stopped, press down on the radi-
ator cap and turn it counterclockwise to re-
move.
1. Stand the vehicle upright on a level surface.
2. Remove:
•
Radiator cap “1”
3. Check:
•
Coolant level
Maximum level “a” or below

Add coolant
up to the maximum level.
NOTICE
ECA24260
• Adding water instead of coolant lowers the
antifreeze content. If, therefore, water is
used instead of coolant, check, and if nec-
essary, adjust the antifreeze concentration.
• Use only distilled water. However, if dis-
Exhaust pipe nut “1”
10 N·m (1.0 kgf·m, 7.4 lb·ft)
Exhaust pipe clamp bolt “2”
12 N·m (1.2 kgf·m, 8.9 lb·ft)
Exhaust pipe clamp bolt “3”
12 N·m (1.2 kgf·m, 8.9 lb·ft)
Silencer bolt (rear) “4”
30 N·m (3.0 kgf·m, 22 lb·ft)
Exhaust pipe protector screw
10 N·m (1.0 kgf·m, 7.4 lb·ft)
LOCTITE®
1
1
T
R
.
.
1 1
2
4
3
T
R
.
.
1. Radiator
1 1