Yamaha YZ250 2021, Owner'S Manual

Page: 53 / 148

ENGINE
3-9
7. Apply:
•
Lithium soap base grease
(on the matching surface “a” on air filter ele-
ment)
8. Install:
•
Air filter element “1”
• Washer
•
Fitting bolt
TIP
Align the projection “a” on filter guide with the
hole “b” in air filter case.
NOTICE
ECA26420
Make sure that the air filter element is prop-
erly seated in the air filter case. The engine
should never be operated without the air fil-
ter element installed, otherwise the piston(s)
and/or cylinder(s) may become excessively
worn.
EAM30541
CHECKING THE CARBURETOR JOINT
1. Check:
•
Carburetor joint “1”
Cracks/damage

Replace.
EAM30542
CHECKING THE CARBURETOR HOSES
The following procedure applies to all of the fuel
and vacuum hoses.
1. Check:
•
Fuel hose
• Carburetor breather hose “1”
•
Overflow hose “2”
Cracks/damage

Replace.
Loose connection

Connect properly.
EAM30221
CHECKING THE EXHAUST SYSTEM
1. Remove:
• Exhaust pipe
•
Silencer
2. Check:
•
Exhaust pipe
• Silencer
Crack/damage

Replace.
3. Check:
•
Silencer fiber
Damage

Replace.
4. Replace:
• Silencer fiber
a. Remove the silencer bolts “1”, silencer “2”
and fiber bolts “3”.
Fitting bolt
2.0 N·m (0.20 kgf·m, 1.5 lb·ft)
a
T
R
.
.
1
1
2
1