Wash and dry
Massage suitable cleaner into the foam and allow five minutes of dwell. Rinse thoroughly, repeating until clean water runs through. Let the filter dry for one to two hours. Never dry it in an oven.
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Re-oil evenly
Apply a light, even coat of foam-filter oil and massage it into the foam. Repeat once. Wipe away excess, especially from the rubber mounting surfaces and inside the base where it grips the intake.
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Refit without crushing the base
Leave both clamps loose initially. Position the intake clamp on the tube’s straight section, not its taper. Tighten by hand with a screwdriver or nut driver only enough to retain the filter, then secure the outer cage clamp. If tightening squeezes the filter off, remove excess oil and retry.
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Sources / references 1
- PERRIN official instructions ↗Reviewed Oct 8, 2026
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