Air Filter Cleaning & Replacement Guide for 2020 Suzuki RM85

Shop parts for a 2020 Suzuki RM85 Dirt Bike.

The 2020 Suzuki RM85 is prized for its lightweight frame and snappy power delivery, making it a favorite among youth riders and racers. Frequent off-road use, though, means exposure to dust and debris, so keeping your air filter clean is critical for peak performance and protecting the engine from damage. Neglect can reduce power, increase engine wear, and lead to costly repairs. This guide is tailored specifically for the 2020 RM85 and leverages MotoSport.com's hands-on dirt bike expertise.

Why Air Filter Maintenance Matters for the 2020 RM85

  • The RM85 uses a foam air filter positioned directly above the engine intake – this filter must be kept clean for optimal airflow and engine protection.
  • The RM85's engine is especially sensitive to dirt ingress, and even minor dust entry can lead to accelerated piston wear.
  • Model-specific tip: The RM85's filter cage and sealing surface can collect fine silt, making rim grease application around the sealing edge crucial for reliability.

Tools & Supplies Needed

  • 8mm socket or T-handle wrench (for seat and airbox cover bolts)
  • Gloves
  • Clean rags or paper towels
  • Bucket with warm soapy water
  • Foam air filter cleaner (not gasoline)
  • Filtered water for rinsing
  • Foam air filter oil
  • Rim grease (or waterproof grease)

Air Filter Removal & Inspection

  1. Remove the seat by loosening the two seat bolts and lifting the seat off.
  2. Undo the airbox cover screws (typically two on the RM85) and carefully lift off the cover. Take care not to let debris fall into the airbox.
    – Visually check inside for any loose dirt; wipe out with a clean damp rag if needed.
  3. Loosen the wing nut or filter retainer and gently remove the filter along with its cage.
    Note: Be cautious not to drop any debris into the intake during removal.
  4. Inspect the filter for signs of tears, hardening, or excessive dirt. Replace if damaged, as leaks lead to rapid engine wear.

Cleaning the Air Filter

  1. Tap the filter or gently squeeze (do not twist.) to knock off excess dirt before washing.
  2. Wash the filter in a bucket of warm soapy water, working out contaminants with your hands. Rinse in clean water until all soap is gone. Multiple washes may be necessary for heavy buildup.
  3. Let the filter air dry completely away from direct heat or sunlight. The foam must be entirely dry before oiling.

Oiling & Reinstallation

  1. Once dry, apply a high-quality foam filter oil to the entire surface of the filter. Work the oil in thoroughly to ensure an even coat.
  2. Apply a thin bead of rim grease around the sealing surface of the filter. The RM85's design means that a perfect seal is vital to block fine dust.
  3. Carefully reinstall the filter onto its cage and fit it back in the airbox, ensuring correct positioning. Secure the filter with the retainer – do not overtighten, just snug.
  4. Replace the airbox cover and seat, tightening the bolts securely.

Replacement Schedule & Pro Tips

  • Clean the air filter after every ride in dusty or wet conditions, or at least every 3-5 hours of riding time.
  • Carry a spare, pre-oiled filter for trackside changes and swap it out if the current filter gets wet or excessively dirty.
  • Check the filter's cage and screen for damage or clogged mesh and replace parts as needed – a compromised cage will compromise engine protection.

Model-Specific Notes for the 2020 RM85

  • The RM85's airbox design lacks a secondary filter screen, so the main filter is the only safeguard – diligence is essential.
  • The OEM air filter retainer is plastic; avoid overtightening to prevent stripping or breakage.
  • Pro racers often upgrade to filter skins or additional mesh for extra protection when riding in mud or sand.

Regular air filter care dramatically extends engine life and preserves the responsive power the RM85 is known for. Keep your filter routine strict, and your 2020 Suzuki will rip the track for seasons to come.

Related Shopping Categories

Shop Air Filters for a 2020 Suzuki RM85 Dirt Bike.

Shop Air Filter Oil for a 2020 Suzuki RM85 Dirt Bike.

Shop Air Box Covers for a 2020 Suzuki RM85 Dirt Bike.

Shop Tools for a 2020 Suzuki RM85 Dirt Bike.

Shop Intake Parts for a 2020 Suzuki RM85 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.