Yamaha WR450F 2021 Owner's Service Manual page 107

a a
3. Remove:
• Air filter guide "1"
• Air filter element "2" (from the air filter guide)
• Guide "3" (from the air filter element)
• Seal "4" (from the air filter element)
3
4. Wash:
• Air filter element
a. After washing the element with air filter
cleaner or kerosene, squeeze and dry it
completely.
EWA19110
WARNING
Do not use gasoline or organic (acid/alka-
line) volatile oil for washing.
ECA24280
NOTICE
Do not twist the element when squeezing the
element.
5. Check:
• Air filter element
Damage  Replace.
6. Apply:
• Yamaha foam air filter oil or other quality
foam air filter oil
a. Put the air filter element into a plastic bag
and drip the filter oil into the bag.
b. With the element inside the bag, rub it
thoroughly so that the element is evenly
permeated with the oil.
c. Wrap the element in a clean cloth, rub the
element gently, and wipe off any excess
oil.
a a
1 1
4 1
2
3-17
TIP
• The element should be permeated with oil so
that it is wet but not dripping.
• When replacing the element, permeate the el-
ement in oil by using the same procedure as
when cleaning.
7. Install:
• Seal "1" (to the air filter element)
• Guide "2" (to the air filter element)
• Air filter element "3" (to the air filter guide)
• Air filter guide "4"
TIP
• Apply lithium soap-based grease on the entire
seal lips when installing the air filter guide.
• Make sure that the two projections "a" at the
rear side of the vehicle on the air filter guide are
securely fitted into the two slots "b" in the air fil-
ter case.
• Check that the air filter element is turned up be-
tween the air filter guide and air filter case and
that there is no gap.
Gap  Reinstall.
1
ENGINE
4
3
a
1
2
b b
a
b