Air Filter Cleaning – Replacement Guide for 2020 Suzuki DRZ400SM

Shop parts for a 2020 Suzuki DRZ400SM Dirt Bike.

The air filter in your 2020 Suzuki DRZ400SM is a crucial component designed to protect the engine from dirt, dust, & debris, ensuring consistent airflow – and optimal riding performance. Neglecting air filter maintenance can result in decreased horsepower, engine wear, or even costly repairs. This guide is tailored specifically for the DRZ400SM – incorporating proprietary tips & instructions for MotoSport customers.

When to Clean or Replace Your DRZ400SM Air Filter

  • Clean the air filter every oil change (typically every 3,000 miles for this model) or sooner for frequent off-road riding.
  • Replace the air filter if you notice tears, excessive dirt that cannot be removed, compromised shape, or signs of glue separation in the seams.
  • Riders in dusty conditions should inspect the filter more frequently.

Tools & Supplies Needed

  • Gloves
  • Foam-specific air filter cleaning solution
  • Filter oil
  • Grease (for filter seal)
  • Garden hose
  • Towel (for drying)

How to Remove, Clean & Reinstall the Filter

  1. Panel Access: Remove the left side panel to access the air box.
  2. Filter Removal: Loosen & remove the retaining pin or screw. Gently slide out the air filter – take note of its orientation.
  3. Initial Rinse: With gloves on, soak the filter with a garden hose. Rinse thoroughly from the inside out to flush dirt & debris away from the foam material.
  4. Apply Cleaner: Spray foam filter cleaner liberally on the inside & outside. Let it soak for 30 seconds to a minute.
  5. Massage Clean: Gently massage – but do not twist, wring, or overly squeeze the filter, as this can damage the seams. Squeeze out excess water using a clean towel if a quick turnaround is needed.
  6. Dry Completely: Air dry thoroughly for at least 5–10 minutes before proceeding. Do not use heat or sunlight directly, which can degrade foam integrity.
  7. Oil Application: Fully saturate the clean, dry filter with foam filter oil. Work oil evenly through the filter – squish out any excess oil: the filter should be tacky, not dripping.
  8. Seal Greasing: Apply a thin coat of grease to the filter's sealing rim for an airtight fit with the air box.
  9. Reinstallation: Insert the filter back into the air box in the original orientation. Secure the retaining pin or screw, then reinstall the side panel.

Model-Specific Notes for the 2020 DRZ400SM

  • The DRZ400SM air box is known for its straightforward access; however, always confirm the filter sits flush with no gaps around the sealing edges.
  • Aftermarket filters such as K&N are available for this bike – follow manufacturer instructions for non-OEM filter types.
  • Use only foam-compatible oils & cleaners. Petroleum-based products may damage foam filters.
  • During wet weather or winter storage, inspecting & oiling your filter before and after rides is especially important for sustained performance.
  • Inspect air box for loose debris while the filter is out – clean as needed without leaving any residue.

Tips for Longevity – Performance

  • Never twist or wring the filter
  • Allow for a thorough drying period
  • Grease the filter seal every removal
  • Always check proper seating inside the air box

MotoSport recommends routine air filter maintenance as part of your regular 2020 DRZ400SM care plan. Riders who keep the filter clean benefit from improved throttle response, longer engine life, – maximum enjoyment on any terrain.

Related Shopping Categories

Shop Air Filters for a 2020 Suzuki DRZ400SM Dirt Bike.

Shop Air Filter Oil for a 2020 Suzuki DRZ400SM Dirt Bike.

Shop Air Box Covers for a 2020 Suzuki DRZ400SM Dirt Bike.

Shop Tools for a 2020 Suzuki DRZ400SM Dirt Bike.

Shop Intake Parts for a 2020 Suzuki DRZ400SM 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.