Polaris FST Touring - Manual (Page 100)

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MAINTENANCE
Foam Oil Breather Element
The foam oil breather element absorbs small amounts of liquid to
protect sensors within the intake system from damage due to oil
ingestion. Clean or replace the breather element at each engine oil
change. Clean the element if the snowmobile has been tipped on its left
side three times, either during service or while riding, as oil may leak
into the element.
CAUTION
Operating the snowmobile with a clogged foam oil breather
element can result in severe engine damage. Always clean or
replace the element as recommended.
The foam oil breather element is located inside the airbox.
A. FS foam element
B. FST foam element
1. Open the hood.
2. Release the airbox cover
retaining clips and remove the
cover.
3. Remove the foam breather
element.
4. Wash the foam element in soapy
water, then rinse thoroughly and
let dry.
NOTE: If soap and water are not
readily available, remove as
much liquid as possible by
pressing the foam element
in paper towels or a similar
absorbent material.
5. Reinstall the dry foam element, or install a new foam element.
NOTE: Always replace a foam element that is brittle, cracked,
crumbling or otherwise damaged. For best performance,
routinely replace the foam element with every other engine
oil change.
6. Reinstall the airbox cover. Secure all retaining clips.