Air Filter Cleaning & Replacement Guide for 2015 Suzuki DRZ400SM

Shop parts for a 2015 Suzuki DRZ400SM Dirt Bike.

The 2015 Suzuki DRZ400SM is renowned for its reliability and versatility, but optimal performanceespecially off-roaddepends on a clean, well-maintained air filter. Regular cleaning and periodic replacement protect your engine from dust and debris, maintaining horsepower and throttle response unique to the DRZ400SM’s agile, supermoto design. Below is MotoSport.com’s proprietary step-by-step guide tailored to this specific model year.

Why Clean or Replace the Air Filter?

  • Prevents engine wear by stopping dust & grit from entering the combustion chamber.
  • Maintains throttle responseclogged filters sap power, especially during hard acceleration.
  • Supports fuel economy and extends overall engine life.

Recommended Service Intervals

  • Clean the air filter after every ride in dusty or off-road conditions, or at minimum with every oil change.
  • Replace the air filter if damaged, excessively dirty, or as recommended in the service schedule. Twin-Air 153156 is a popular replacement for the DR-Z400SM1 .

Tools & Supplies

  • Clean rags
  • Air filter cleaner (foam filter-specific is best)
  • Air filter oil (foam filter-specific)
  • Grease (lithium soap-based for sealing)
  • Replacement filter (if necessary, e.g., Twin-Air 153156)
  • Phillips screwdriver/socket set
  • Nitrite gloves (optional but recommended)

How to Remove the Air Filter

  1. Turn off the bike and ensure the engine is cool for safety.
  2. Remove the seat by unlocking and lifting it off.
  3. Unscrew the side panel (typically Phillips screws or quick-release)
  4. Locate the air boxusually obvious underneath the seat.
  5. Unscrew and carefully pull the air filter out, noting the orientation, as proper installation is important2 .

Cleaning Process

  1. Tap the filter gently to dislodge loose debris.
  2. Apply foam-filter cleaner evenly, both inside and out. Let it soak for 8-10 minutes for thorough dirt breakdown3 .
  3. Rinse the filter from the inside out with a gentle stream of water. This direction prevents embedding dirt deeper in the foam2 .
  4. Repeat if necessary until the water runs clear.
  5. Allow the filter to completely air dryavoid direct sunlight and heat sources, which can deteriorate the foam5 .

Oiling the Clean Filter

  1. Once dry, apply air filter oil generously. Work the oil through the foam to ensure even coverage, but do not oversaturate1 .
  2. Gently squeeze (never wring) the filter to remove excess oil1 .
  3. Apply a thin smear of grease around the sealing edge/lip to prevent unfiltered air from sneaking past1 .

Reinstallation & Replacement

  1. Check the air box for debris and wipe clean before refitting the filter.
  2. Install the cleaned or new air filter in the correct orientation.
  3. Secure the cover and reattach all panels.
  4. Reinstall the seat, ensuring all fasteners are snug.

Special Notes for 2015 DRZ400SM Owners

  • This model is fitted with a foam air filternever use compressed air or solvents not rated for foam, as they degrade the filter.
  • The DRZ400SM’s air box is slightly different from the DRZ400S, so double-check panel removal and ensure proper sealing after maintenance.
  • Factory recommendation is Twin-Air 153156 or OEM Suzuki replacements for best performance and fitment.

When to Replace, Not Clean

  • Tears, brittle feeling, or collapsed foam on the filter
  • Persistent foul odors or oil that won’t rinse out
  • Noticeably reduced performance or difficult starting (after ruling out fuel/spark issues)

Regular air filter maintenance is the easiest way to protect your 2015 Suzuki DRZ400SM’s engine and keep the unique, nimble character of this supermoto at its best. Ride safe and keep your machine breathing clean.

Related Shopping Categories

Shop Air Filters for a 2015 Suzuki DRZ400SM Dirt Bike.

Shop Air Filter Oil for a 2015 Suzuki DRZ400SM Dirt Bike.

Shop Air Box Covers for a 2015 Suzuki DRZ400SM Dirt Bike.

Shop Tools for a 2015 Suzuki DRZ400SM Dirt Bike.

Shop Intake Parts for a 2015 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.