Air Filter Cleaning – Replacement Guide for 2009 Suzuki RM85L

Shop parts for a 2009 Suzuki RM85L Dirt Bike.

The 2009 Suzuki RM85L is well-regarded for its punchy power delivery and robust performance on the track, making proper air filter maintenance essential for reliability and engine health. The air filter protects your engine from dust, dirt and debris—neglecting it can quickly lead to decreased performance and expensive repairs. Follow this proprietary MotoSport guide to keep your RM85L running at its best.

Preparation – Tools & Supplies

  • Non-flammable cleaning solvent (such as MOTUL AIR FILTER CLEAN, or equivalent).
  • Foam filter oil (such as MOTUL AIR FILTER OIL, or equivalent).
  • Plastic bag for oiling.
  • Grease for sealing the filter rim.
  • Protective gloves to keep oil & chemicals off your skin.
  • Clean rags/paper towels.
  • Basic hand tools to remove seat and air filter cap.

Removal – How to Access the Air Filter

  • Remove the seat by loosening the screws or bolts securing it to the bike.
  • Take off the air cleaner cap inside the airbox.
  • Locate and remove the wing nut holding the air filter element in place.
  • Carefully take out the filter from its holder—avoid spilling debris into the airbox.

Cleaning the Air Filter

  • Immerse the foam element in your solvent and gently squeeze out dirt and oil; do not twist or wring, as this can crack or damage the foam.
  • Repeat squeezing and rinsing until the filter is visibly clean.
  • Allow the filter to fully air dry before re-oiling. Patience here pays off—never install a damp filter.

Oiling the Filter

  • Place dry filter in a plastic bag, pour in foam filter oil, and knead oil evenly through the foam until every pore is coated and the entire element is uniform in color.
  • Squeeze out excess oil (but don't wring). Aim for a thin, even oil film to trap dirt without restricting airflow.

Inspection – Tips for the RM85L

  • Check the airbox for loose debris or signs of dirt bypassing the filter before reinstallation. Clean thoroughly if needed.
  • Inspect filter for cracks, tears, or excessive wear—if damaged, replace immediately to avoid engine contamination.

Installing the Filter

  • Apply a thin layer of grease to the base of the filter rim where it contacts the airbox for a tight seal.
  • Fit the filter element securely onto its holder, replace the wing nut, and reinstall the cap.
  • Reattach the seat and verify all bolts are tight.

Replacement Intervals – Maintenance Notes

  • Clean and oil the filter after every ride in dusty conditions, or at minimum, every 5-10 hours of use.
  • Always keep a spare, pre-oiled filter for quick swaps during long rides or races.
  • Genuine Suzuki or high-performance aftermarket air filters available from MotoSport ensure best fit and filtration.

RM85L Owner Insights

  • 2009 RM85L features longer wheelbase and suspension travel compared to the standard RM85—ideal for taller riders and track use.
  • Proper air filter maintenance is especially crucial on this model due to its high-revving, performance-oriented engine—keep intake airtight to avoid lean mixtures or premature wear.
  • Use recommended filter oil and maintain a perfectly clean airbox for optimal carburetor function and engine longevity.

Keep your air filter in perfect condition using MotoSport parts, and maximize the power, reliability, and life of your 2009 Suzuki RM85L every ride.

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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.