Checking The Cylinder Head Breather Hose; Checking The Exhaust System - Yamaha YZ450FN 2022 Owner's Service Manual

3. Install:
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air scoop (left/right)
• Seat
• Side cover (left/right)
Refer to "GENERAL CHASSIS" on page 4-1.
EAM30476
CHECKING THE CYLINDER HEAD
BREATHER HOSE
1. Check:
• Breather hose "1"
Crack/damage  Replace.
Loose connection  Connect properly.
ECA14920
NOTICE
Make sure the cylinder head breather hose is
routed correctly.
EAM30221

CHECKING THE EXHAUST SYSTEM

1. Remove:
• Exhaust pipe 1
• Exhaust pipe 2
Refer to "ENGINE REMOVAL" on page 5-6.
2. Remove:
• Exhaust pipe protector
3. Check:
• Exhaust pipe 1
• Exhaust pipe 2
• Silencer
Crack/damage  Replace.
4. Check:
• Silencer fiber
1
Damage  Replace.
5. Replace:
• Silencer fiber
a. Remove the bolts "1" and silencer body
"2".
ECA25800
NOTICE
Do not hit the silencer stay "a" as it may do
damage to the silencer.
TIP
Remove the inner pipe while holding the silencer
in place with a vise etc.
1
b. Remove the rivets "3" and silencer cap "4".
4
c. Replace the fiber inserts "5".
3-18
ENGINE
a
1
2
3