Air Filter Cleaning & Replacement Guide for 2008 Suzuki RM85L

Shop parts for a 2008 Suzuki RM85L Dirt Bike.

The 2008 Suzuki RM85L is a top choice for youth and smaller riders hitting the track or trail with a high-revving two-stroke and lightweight handling. Proper care of its air filter is a must for longevity and performance, as a clogged or deteriorated filter can starve the engine of air or allow damaging debris inside. The RM85L uses a dual-stage open-cell foam filter—vital for effective filtration in dusty or sandy motocross and off-road environments.

Things to Know Specific to the 2008 Suzuki RM85L

  • The RM85L air filter is a dual-layer foam element, designed to maximize airflow while trapping tiny particles. Both aftermarket and OEM options are widely available in pre-oiled, disposable, or washable types.
  • The filter sits in a high-flow airbox behind a quick-release seat for easy access. Always verify the filter is seated tightly to prevent dust bypass—especially important for this model due to its simple airbox design.
  • The RM85L's engine is tuned for high rpm. Even minor air restriction can cause a rich mixture, poor throttle response, or fouled spark plugs.
  • Pre-oiled, disposable filters are popular for convenience, but high-mileage or competitive riders may prefer a washable, reusable filter for cost and performance.

Air Filter Removal Steps

  1. Remove the seat by loosening the mounting bolts (typically 8mm) at the rear.
  2. Locate the air filter within the airbox and unscrew or unclip the filter cage retainer.
  3. Carefully remove the filter and its supporting cage. Inspect the filter for dirt, tears, or deterioration.

Cleaning Your RM85L Air Filter

  • If using a washable filter, gently separate the foam from the cage.
  • Soak the foam in a bucket of biodegradable filter cleaner or mild soap solution. Gently massage to remove dirt. Avoid wringing or twisting, as this can tear the foam.
  • Rinse thoroughly with clean water. Allow the filter to air dry completely—never install a wet filter.
  • Once dry, thoroughly saturate with foam air filter oil. Work the oil through the foam until coverage is uniform but not dripping. Let excess oil drain.
  • Reassemble the filter on its cage, ensuring tight seals at every edge. Replace if you notice any cracking or breakdown of the foam.

Note: If using a disposable, pre-oiled filter, do not attempt to wash and reuse. Simply replace with a new unit when dirty or at routine intervals for best engine protection.

Reinstalling the Filter

  1. Insert the filter assembly into the airbox, paying careful attention to sealing edges—the rubber gasket should seat tightly against the airbox flange.
  2. Secure the cage retainer tightly, but do not overtighten as this can deform the cage or airbox.
  3. Inspect the airbox for excess dirt or water and clean as needed before reinstalling the seat.

How Often to Clean or Replace

  • Clean or replace the filter after every race or trail ride in dusty conditions. For less demanding rides, inspect after every 2-3 rides and clean when visibly dirty.
  • Always replace a filter that is damaged, deteriorating, or no longer seals tightly.
  • Stock up on 2-3 filters for fast swaps on race weekends or long riding trips.

Special Tips for the 2008 RM85L Owner

  • Apply a thin layer of waterproof grease along the sealing edge of the filter for added dust protection.
  • Use gloves when handling filter oil and cleaning solvents for safety.
  • Check the filter install twice—even a small sealing gap can let in harmful dust on this model's open intake tract.
  • Avoid using gasoline or harsh chemicals when washing the filter—these can break down the foam.

Rely on proactive air filter care to keep your 2008 Suzuki RM85L at peak performance—this simple maintenance is your best defense against costly engine repairs and lost riding time.

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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.