Yamaha YZ 2017 Series, Owner'S Service Manual, Page: 101 / 410

ENGINE
3-13
6. Install:
• Air filter guide “1” (to the air filter element)
• Air filter element “2”
• Air filter mounting bolt “3”
7. Install:
• Air filter case cover “1”
TIP
Align the air filter case cover groove “a” with the
air filter case edge “b”.
8. Install:
• Fuel tank cap cover
EASB29B081 CHECKING THE THROTTLE BODY JOINT
1. Check:
• Throttle body joint
Refer to “CHECKING THE THROTTLE
BODY JOINT” on page 7-10.
EASB29B082
CHECKING THE BREATHER HOSES
1. Check:
• Breather hose “1”
Crack/damage

Replace.
Loose connection

Connect properly.
ECA
NOTICE
Make sure the cylinder head breather hose
is routed correctly.
EASB29B083 CHECKING THE EXHAUST SYSTEM
1. Remove:
• Exhaust pipe protector
2. Check:
• Exhaust pipe 1
• Exhaust pipe 2
• Silencer
Crack/damage

Replace.
Refer to “ENGINE REMOVAL” on page 5-1.
• Exhaust gas
Leaks

Replace the gasket.
Refer to “ENGINE REMOVAL” on page 5-1.
3. Check:
• Tightening torques
Air filter mounting bolt
2.0 Nm (0.20 m·kgf, 1.4 ft·lbf)
T
R
.
.
3
1
2
a
b
1
Exhaust pipe 1 bolt and nut “1”
20 Nm (2.0 m·kgf, 14 ft·lbf)
Exhaust pipe 1 and exhaust pipe
2 bolt “2”
12 Nm (1.2 m·kgf, 8.7 ft·lbf)
Exhaust pipe 2 and silencer bolt
“3”
12 Nm (1.2 m·kgf, 8.7 ft·lbf)
Silencer and silencer bracket bolt
“4”
30 Nm (3.0 m·kgf, 22 ft·lbf)
1
1
1
T
R
.
.
2
1