Checking The Throttle Body Joint; Checking The Breather Hoses; Checking The Exhaust System - Yamaha YZ250F 2016 Owner's Service Manual

4. Check:
• Air filter element
Damage  Replace.
5. Foam-air-filter oil or equivalent oil to the ele-
ment
Oil application quantify
50 g
TIP
Squeeze out the excess oil. Element should be
wet but not dripping.
6. Install:
• Air filter guide "1" (to the air filter element)
• Air filter element "2"
• Air filter mounting bolt "3"
Air filter mounting bolt
2.0 Nm (0.20 m·kgf, 1.4 ft·lbf)
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
1
3
2
1
a
b

CHECKING THE THROTTLE BODY JOINT

EAS1SM9079
1. Check:
• Throttle body joint
Refer to "CHECKING THE THROTTLE
BODY JOINT" on page 7-8.

CHECKING THE BREATHER HOSES

EAS1SM9080
1. Check:
• Breather hose "1"
Crack/damage  Replace.
Loose connection  Connect properly.
ECA14920
NOTICE
Make sure the cylinder head breather hose
is routed correctly.
EAS1SM9081

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
Exhaust pipe bolt 1 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)
3-13
ENGINE
1