Yamaha WR450FN 2022, Owner'S Service Manual

Page: 109 / 402

ENGINE
3-19
EAM30221
CHECKING THE EXHAUST SYSTEM
WARNING
EWA19350
• Be sure the exhaust pipe and muffler are
cool before cleaning the spark arrester.
• Do not start the engine when cleaning 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.
Refer to “ENGINE REMOVAL” on page 5-6.
4. Check:
• Spark arrester
Carbon deposits

clean
5. Clean:
•
Spark arrester
a. Remove the silencer cap screws “1”.
b. Remove the spark arrester bolts “2”.
c. Remove the tail pipe “3”, tail pipe gasket
“4” and spark arrester “5”.
TIP
Pull the spark arrester out of the muffler.
d. Remove the spark arrester gasket “6”.
e. Clean the spark arrester.
TIP
Tap the spark arrester lightly, then use a wire
brush to remove any carbon deposits.
f. Install the spark arrester gasket (new gas-
ket) and spark arrester.
TIP
Insert the spark arrester into the muffler and
align the bolt holes.
g. Install the tail pipe gasket (new gasket)
and spark arrester bolts.
h. Install the silencer cap.
TIP
First tighten the two screws “a” located horizon-
tally apart, and then tighten the others.
1
Spark arrester bolt
9 N·m (0.9 kgf·m, 6.6 lb·ft)
Silencer cap screw
5 N·m (0.5 kgf·m, 3.7 lb·ft)
2
3
4
5
6
T
R
.
.
T
R
.
.