Air Filter Cleaning – Replacement Guide for 2018 Husqvarna TE250i

Shop parts for a 2018 Husqvarna TE250i Dirt Bike.

The 2018 Husqvarna TE250i stands out with its innovative fuel-injected 2-stroke engine, electronically regulated oil injection, and advanced electronics—a combination that makes its maintenance needs, especially air filtration, both familiar and distinct. Because the TE250i's electronic fuel injection system relies heavily on clean airflow and precise sensor input, keeping the air filter in top condition is critical for performance and longevity.

Unique Features for the 2018 TE250i

  • Fuel Injection System: This model features a 39mm Dell'Orto throttle body with sensors for air temperature, pressure, and throttle position. Clean air is crucial as sensor errors or blocked flow can directly impact EFI performance.–
  • Dual-Layer Foam Air Filter: Models like the 2018 TE250i use a dual-stage foam air filter, with a coarse outer layer for larger debris and a finer inner layer for small particles. Using OEM-spec or high-performance filters ensures proper fitment and filtration.–

Proprietary MotoSport Air Filter Cleaning – Replacement Method

Recommended Cleaning Interval: For standard trail riding, inspect and clean the air filter every 8–10 hours, or after each ride in dusty or wet conditions. Replace the filter as needed—never reuse if it's torn or excessively dirty.

  1. Remove the Seat and Filter: Use the release latch to lift the seat. Loosen and remove the filter cage knob, then carefully wiggle the air filter and cage out of the airbox.
  2. Inspect the Filter: Check for rips, holes, or hardened foam. If damaged, replace immediately. Inspect the airbox for debris and wipe clean with a damp cloth, taking care to avoid pushing dirt into the intake.
  3. Clean the Filter:
    • Tap to remove loose dirt. Pre-clean with compressed air if needed, blowing from the inside outward.
    • Wash in a bucket of warm water with air filter cleaner or mild detergent. Gently work out the dirt—do not wring or twist the foam to avoid tearing the seams.
    • Rinse thoroughly to remove all cleaner and dirt. Gently squeeze out water and allow the filter to air dry—avoid direct heat or sunlight.
  4. Oil the Filter: Apply high-quality foam air filter oil evenly. Massage into the foam for full saturation. Remove excess by gently squeezing (not twisting). Oil stops dust and fine debris from passing through.
  5. Reinstall the Filter: Check that the filter cage and sealing surfaces are free of dirt. Place the filter onto the cage, align the mounting tabs, and carefully reinstall in the airbox. Make sure it seals evenly to prevent intake leaks.
  6. Final Check: Refit seat. Confirm airbox tabs are secure and throttle response is unhindered before riding.

2018 TE250i Model-Specific Notes

  • The unique oil-injected two-stroke system means maintaining a clean air filter is especially critical—any restriction or dirty intake can throw off the air/oil/fuel mixture, causing running issues.
  • Always ensure filter sealing edges are clean, and surfaces inside the airbox remain spotless. The EFI system's multiple air-related sensors make the TE250i more sensitive than older carbureted models.
  • Dual-stage filters are the norm for best performance—choose high-quality replacements from trusted brands and never run oiled gauze or paper-style filters not designed for this application.

Pro Tips from MotoSport

  • Always keep a spare, pre-oiled filter ready for quick swaps during multi-day rides or races.
  • Use air filter grease at the rim for extra sealing, especially in dusty environments.
  • The TE250i's air filter access is designed for easy maintenance—no excuses for a dirty filter.

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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.