Yamaha WR426F(P) Owner's Service Manual page 264

AIR FILTER CLEANING
1. Remove:
Seat
G
2. Disconnect:
Tail light lead connectors 1
G
3. Remove:
Air filter case cover 2
G
4. Remove:
Fitting bolt 1
G
Washer 2
G
Air filter element 3
G
Filter guide 4
G
5. Clean:
Air filter element
G
Clean them with solvent.
NOTE:
After cleaning, remove the remaining solvent
by squeezing the element.
CAUTION:
Do not twist the element when squeezing
G
the element.
Leaving too much of solvent in the ele-
G
ment may result in poor starting.
6. Inspect:
Air filter element
G
Damage → Replace.
7. Apply:
Foam-air-filter oil or engine mixing oil
G
To the element.
NOTE:
Squeeze out the excess oil. Element should be
wet but not dripping.
8. Install:
Filter guide 1
G
NOTE:
Align the projection a on filter guide with the
hole b in air filter element.
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INSP
ADJ