Qlink RD400 User Manual page 124

8. Apply atv foam air filter oil or other quality foam air
filter oil to the air filter element.
NOTE:
The air filter element should be wet but not dripping.
9. Pull the air filter element over its frame, and then install
the lock plate.
10. Install the air filter element assembly.
11. Install the air filter case cover by hooking the fasteners
onto the air filter case.
12. Install the seat.
USER'S MANUAL
NOTE:
The air filter element should be cleaned every
20-40 hours. It should be cleaned and lubricated more
often if the machine is operated in extremely dusty areas.
Each time the air filter element maintenance is performed,
check the air inlet to the filter case for obstructions.
Check the air filter case rubber joint to the carburetor
and manifold fittings for an airtight seal. Tighten all
fittings securely to avoid the possibility of unfiltered
air entering the engine.
Never operate the engine with the air filter element removed.
This will allow unfiltered air to enter, causing rapid engine
wear and possible engine damage.
Additionally, operation without the air filter element will
affect carburetor jetting with subsequent poor performance
and possible engine overheating.
118