Yamaha WR426F(N) Owner's Service Manual page 258

AIR FILTER CLEANING
1. Remove:
Seat
2. Disconnect:
Tail light lead connectors 1
3. Remove:
Air filter case cover 2
4. Remove:
Fitting bolt 1
Washer 2
Air filter element 3
Filter guide 4
5. Clean:
Air filter element
Clean them with solvent.
NOTE:
After cleaning, remove the remaining solvent
by squeezing the element.
CAUTION:
Do not twist the element when squeezing
the element.
Leaving too much of solvent in the ele-
ment may result in poor starting.
6. Inspect:
Air filter element
Damage
7. Apply:
Foam-air-filter oil or engine mixing oil
To the element.
NOTE:
Squeeze out the excess oil. Element should
be wet but not dripping.
8. Install:
Filter guide 1
NOTE:
Align the projection a on filter guide with the
hole b in air filter element.
3 - 13
INSP
ADJ
Replace.