Air Filter Cleaning – Replacement Guide for 2013 Suzuki RM85

Shop parts for a 2013 Suzuki RM85 Dirt Bike.

The air filter in your 2013 Suzuki RM85 is critical for engine performance and longevity. Proper cleaning and timely replacement prevent dirt, dust, and debris from entering the engine, safeguarding your bike’s power and reliability both on the track and trail. This MotoSport-exclusive guide delivers a step-by-step process for cleaning and changing your RM85’s air filter, with special notes unique to this model year.

Why Regular Air Filter Maintenance Matters

  • Ensures optimal engine airflow and performance
  • Prevents premature engine wear from dirt and particulates
  • Maintains strong throttle response and consistent power delivery

What Makes Your 2013 Suzuki RM85 Unique?

  • This model uses a foam air filter accessible beneath the seat, attached via a wingnut, making service straightforward with basic tools.
  • Compact two-stroke design means good air filter maintenance is crucial to avoid cylinder and piston damage.
  • Some owners add a filter screen cover for increased protection against fine dust and sand–an option to consider if you ride in very sandy or dusty conditions.

Tools & Supplies Needed

  • Socket wrench or 8mm T-handle (for seat bolts)
  • Clean nitrile gloves (for handling oily filters)
  • Air filter cleaning solution or mild detergent
  • Bucket for washing
  • Dedicated air filter oil (foam filter type)
  • Paper towels or clean rags
  • Waterproof grease

Step-by-Step Air Filter Cleaning & Replacement

  1. Remove the Seat:
    Use a socket wrench to remove the seat bolts. Lift off the seat to access the air box beneath.
  2. Remove the Air Filter:
    Locate the wingnut securing the air filter cage. Unscrew it by hand while keeping your gloves on–the filter oil can be sticky.
  3. Inspect the Filter:
    Remove the foam filter from the cage. If there are signs of tearing, holes, or fuel/oil saturation, replace instead of cleaning.
  4. Clean the Filter:
    Wash the foam filter in a bucket using the recommended cleaner. Gently squeeze (never wring) to avoid damage. Rinse thoroughly until all dirt and old oil are removed. Allow to dry completely.
  5. Oil the Filter:
    Pour air filter oil evenly on the clean, dry filter. Work it in by hand, ensuring the entire filter is saturated–especially the sealing rim.
  6. Grease the Sealing Rim:
    Apply a thin bead of waterproof grease to the filter’s sealing edge to prevent fine dust intrusion.
  7. Clean the Airbox:
    Wipe out any dirt or dust inside the airbox and along the sealing surfaces with a damp rag or paper towel.
  8. Reinstall the Filter:
    Place the filter on the cage, align properly, and reinstall using the wingnut–finger tight only.
  9. Reinstall the Seat:
    Bolt the seat securely back in place.

When to Replace the Air Filter

  • If the foam is torn, hardened, or does not return to shape after cleaning, replace immediately.
  • Always replace after five to ten thorough cleanings, or sooner if you ride in extremely dusty or sandy conditions.

RM85 Maintenance Tips

  • Check and clean the filter after every ride in dusty conditions.
  • Avoid over-oiling–excess oil can restrict airflow and cause rich running.
  • Inspect the air filter cage and wingnut for cracks or damage each time you clean.

Consistent air filter care keeps your 2013 Suzuki RM85 running strong. Thoroughly cleaning and properly oiling your filter ensures maximum protection and best-in-class two-stroke performance, lap after lap.

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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.