Air Filter Cleaning – Replacement Guide for 2011 KTM 105SX

Shop parts for a 2011 KTM 105SX Dirt Bike.

The 2011 KTM 105SX is a high-revving, race-ready mini designed for maximum performance in 2-stroke competition. A routinely cleaned and properly installed air filter is essential for protecting the engine and ensuring optimal power delivery, particularly given the high-output nature of this model. Owners should note the 105SX uses a dual-layer, open-cell polyurethane foam filter designed for superior filtration and flow in extreme riding environments.

How to Remove the Air Filter

  • Remove the seat by releasing the seat latch located at the rear.
  • Locate the airbox beneath the seat. Gently pull the filter frame out–do not force it to avoid damage to the mounting tabs.
  • Carefully detach the air filter from the cage, noting the position and orientation for later reinstallation.

Cleaning the Air Filter

  • Inspect the filter for excessive dirt or damage. If torn, replace with a new unit to avoid engine risk–MotoSport.com stocks exact fit foam filters for your 105SX.
  • Wash the filter by soaking it in a dedicated foam filter cleaner. Gently squeeze – never twist – to prevent the seams from splitting.
  • Rinse repeatedly until the cleaner and all debris are flushed out, then squeeze out water and let air dry completely. Never use compressed air, which can deteriorate the foam structure.
  • Once dry, generously apply foam filter oil. Ensure full coverage but avoid over-saturating, which can hamper airflow.

Reinstalling the Air Filter

  • Refit the filter securely around the filter cage. Check for even sealing around the entire perimeter–a common weak point in the 105SX's airbox is improper sealing which allows dirt into the intake path.
  • Inspect the airbox and intake tract for residual dirt before installation. Wipe clean to avoid contaminating a fresh filter.
  • Fit the filter cage and filter assembly into the airbox. Confirm a snug, dust-resistant fit.
  • Replace the seat and confirm all latches are secure.

Replacement Intervals & Special Notes

  • For the 2011 KTM 105SX, frequent filter inspections are recommended–after every ride in sandy or dusty conditions, or at least every 8 hours of operation in clean environments.
  • This model's high-strung 2-stroke engine is especially sensitive to airflow restrictions and intake contamination. Owners should prioritize filter hygiene to protect the top end and maintain power.
  • Use only high-quality, dual-layer foam filters, as specified for direct fitment, to guarantee both dust protection and airflow.
  • Inspect the filter cage for cracks. Replace worn hardware to prevent intake leaks.

Proper care of your air filter ensures that your 2011 KTM 105SX remains powerful, reliable, and ready for any dirt track challenge. For all parts, including replacement filters and filter oils, MotoSport.com has direct-fit components ready for your ride.

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Shop Intake Parts for a 2011 KTM 105SX 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.