Air Filter Cleaning & Replacement Guide for 2013 Suzuki DRZ400S

Shop parts for a 2013 Suzuki DRZ400S Dirt Bike.

Maintaining your 2013 Suzuki DRZ400S air filter is essential for peak performance, especially since this legendary dual-sport is often used for both rugged off-road adventures and daily commutes. Clogged or dirty air filters can limit airflow, compromise engine output, – and over time – increase engine wear. Use this proprietary MotoSport guide to ensure your DR-Z stays ready for the next ride.

Required Tools & Supplies

  • Clean gloves
  • Filter-specific cleaner
  • Air filter oil
  • Small brush or toothbrush (optional, for stubborn grime)
  • Funnel (for oil application)
  • Grease (for filter sealing surface)
  • Lint-free towels
  • Replacement filter (OEM or performance upgrade if needed)

Removal & Inspection

  • Remove your seat and side panel to access the airbox.
  • Locate the locking pin; pull it free and gently slide out the filter. Do not damage the foam element or rubber gaskets.
  • Inspect the filter. If it is torn, brittle, or overly grimy, replace it immediately for best engine health.

Cleaning Process

  1. Lightly tap the filter to remove loose dirt.
  2. Spray with air filter cleaner – thoroughly saturate inside and outside.
  3. Let the cleaner soak for 5-10 minutes.
  4. Rinse gently with a hose from the inside out to push particles out of the foam, never into it. Repeat until water runs clear.
  5. Avoid twisting or wringing to protect the glued seams. Simply squeeze out excess water using a towel, or let air dry for optimal results.

Oil Application

  • Once dry, apply air filter oil evenly across the foam. Use hands to massage the oil into every crevice without over-saturating.
  • Gently squeeze (not wring) to remove excess oil.
  • Apply a thin layer of grease on the inner lip/sealing edge for a tight seal – this prevents dust ingress into your intake.

Refitting the Filter

  • Reinstall the filter, ensure a snug fit against the airbox.
  • Replace the cover and locking pin.
  • Reinstall the seat and side panel. Double-check every connection and seal.

When to Replace the Filter

  • Check and clean the filter every oil change (about every 3,000 miles) or after heavy dust/mud rides.
  • Replace the filter if you notice tears, loose seams, excessive wear, or persistent engine performance issues.
  • Consider an air filter screen cover for added mud and sand protection on tough trails.

Special Notes for 2013 DRZ400S Owners

  • This model uses a robust foam filter designed for both commuting and aggressive trail riding. Pay special attention to outer debris after off-road sessions, and periodically inspect the airbox itself for build-up.
  • Never use gasoline, harsh solvents, or compressed air to clean the foam – these methods can degrade filters and cause poor engine performance.
  • For best results, keep two filters on hand. Alternate them between cleaning cycles to limit downtime.

Related Shopping Categories

Shop Air Filters for a 2013 Suzuki DRZ400S Dirt Bike.

Shop Air Filter Oil for a 2013 Suzuki DRZ400S Dirt Bike.

Shop Air Box Covers for a 2013 Suzuki DRZ400S Dirt Bike.

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Shop Intake Parts for a 2013 Suzuki DRZ400S Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.