Air Filter Cleaning – Replacement Guide for 2021 Suzuki RM85
Shop parts for a 2021 Suzuki RM85 Dirt Bike.
Keeping the air filter on your 2021 Suzuki RM85 clean and properly maintained is critical for performance, engine life, and riding enjoyment. MotoSport.com offers the proprietary methods below to help you maximize throttle response – and minimize wear & tear – every time you scrub, whip, or rail a berm.
Why Air Filter Care Is Important for the 2021 RM85
The 2021 RM85 uses a high-flow foam filter to protect its two-stroke engine from harmful dirt and debris. A clogged, torn, or poorly oiled filter can result in premature engine wear, power loss, or engine failure. Given the RM85’s high-revving nature and off-road duty, neglecting air filter care is one of the quickest ways to hurt performance over time.
How Often Should You Clean or Replace the Filter?
- After every 1–3 rides in dry, dusty, or sandy conditions
- After every wet, muddy. or extended ride (especially in racing or deep water crossings)
- Replace the filter at the first sign of excessive wear, cracking, holes, or if it cannot come clean after proper washing
Model–Specific Tips for the 2021 Suzuki RM85
- The RM85 relies on a single, removable foam element for air filtration. Always ensure the filter screen is in place for additional protection in harsh environments.
- The air box and filter are accessed quickly – a real advantage for trackside maintenance between motos.
- If you ride in heavy sand or muddy conditions, consider running a pre-filter or dual-layer foam system for extra engine protection.
Step-by-Step Air Filter Cleaning Instructions
- Remove the Seat: Release the seat bolts and pull the seat off to access the air box.
- Remove the Air Filter: Unscrew or unclip the filter retainer and carefully withdraw the air filter. Watch for dirt on top – don’t knock it into the air boot.
- Inspect the Filter and Air Box: Check the filter for tears, crushed foam, or weak glue lines. Wipe out dirt in the air box with a damp cloth – never let dirt fall into the intake.
- Wash the Filter:
- Use a non-flammable, air filter-specific cleaner or mild soap and warm water in a wash tub.
- Submerge and gently squeeze out dirt. Do not twist or wring the foam, as this causes cracks.
- Rinse until the water runs clear.
- Dry the Filter: Gently blot the filter with paper towels, then allow it to fully air dry. Avoid direct sun or high heat.
- Oil the Filter:
- Apply foam-specific air filter oil evenly. Massage thoroughly to ensure all pores/trapped dust are coated.
- Do not over-oil – squeeze out excess, but don’t leave dry spots.
- Reinstall the Filter:
- Double-check for any missed dirt or debris in the air box area.
- Seat the filter precisely on its mounting flange, ensuring a complete air seal.
- Secure the retainer and reinstall the seat.
When to Replace the Air Filter
- If the foam is brittle, torn, missing chunks, or the glue seam is failing
- After repeated cleanings if the filter won’t clean up thoroughly
- As a best practice, always keep a spare filter clean and ready for a quick swap
Extra MotoSport.com Tips for RM85 Owners
- Use filter grease along the air box sealing surface for 100 percent dust protection in extreme conditions.
- Inspect the filter screen under the foam for bends or clogging, especially after sandy rides.
- Check the air box drain following extremely wet rides – water and mud can lurk undetected and damage your motor.
- Keep a dedicated wash bucket and cleaning solvent for air filters only to prevent cross-contamination.
Routine air filter care is the difference between consistent RM85 performance and expensive rebuilds. Stay ahead of dirt – trust the process, and your Suzuki will always deliver that iconic 85cc punch on track or trail.
Related Shopping Categories
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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.
