Yamaha YFM225S 1985 Owner's Manual page 76

8. Reinstall the element assembly and parts
removed for access.
9.
The air filter element should be cleaned
every 20 - 40 hours. It should be clean-
ed and lubricated more often if the
machine is operated in extremely dusty
areas.
NOTE:~~~~~~~~~~~~~
Each ti me filter element maintenance is per-
formed, check the air inlet to the fi lter case
for obstructions. Check the air cleaner joint
rubber to the carburetor and man ifold fittings
for an air-tight seal. Tighten all fittings
thoroughly to avoid the posibil ity of unf iltered
air entering the engine.
Never operate the engine with the air filter
element removed. This will allow unfiltered
air to enter, causing rapid wear and possible
engine damage. Additionally, operation
without the filter element will affect
carburetor jetting with subsequent poor
performance and possible engine overheating.
Carburetor adjustment
The carburetor is a vital part of t he engine
and requires very sophisticated adjustment.
Most adjusting should be left to a Yamaha
dealer who has the professional kn owledge
and experience to do so. However, the follow-
ing point may be serviced by t he
o~ ner
as
part of his usual maintenance routine.
The carburetor was set at the Yamaha fac-
tory after many tests. If the settings are
disturbed without having techn ica l know-
ledge, poor engine performance and da-
mage may result.
~ 69-
)