Air Filter Cleaning & Replacement Guide for 2018 Suzuki RM85

Shop parts for a 2018 Suzuki RM85 Dirt Bike.

The 2018 Suzuki RM85 is a race-ready machine straight from the factory, but to keep it performing at its peak, regular air filter maintenance is vital. Neglecting the air filter quickly robs your RM85 of power and risks engine damage. Here is MotoSport's in-depth, step-by-step guide for cleaning and replacing your air filter, ensuring maximum performance and engine longevity specific to your '18 RM85.

Why Regular Air Filter Maintenance Matters

  • Dirt bikes rely on a steady flow of clean air for optimal combustion; clogged or dirty filters result in poor throttle response and possible engine wear.
  • The RM85, with its precise two-stroke engine, is especially sensitive to dirt intake and air restriction.
  • A well-maintained air filter is crucial if you ride in dusty or sandy environments – conditions the RM85 is built to tackle but only with proper upkeep.

How to Remove the RM85 Air Filter

  1. Remove the seat by unfastening the seat bolts.
    This exposes the airbox; no tools beyond a basic socket wrench or Phillips screwdriver are usually required.
  2. Take off the air cleaner cap by unscrewing the large wing nut and pulling away the plastic cover.
    The filter element and its cage are now accessible.
  3. Carefully remove the air filter from the cage. Inspect the seal to ensure no dirt bypassed the filter.
    If dirt is present past the crown, clean the airbox and check for filter damage immediately; dirt entering the engine is a sign of a poor seal or overdue maintenance.

Cleaning the RM85 Air Filter

  1. Fill a container large enough to submerge your foam filter with a non-flammable, dirt bike-approved cleaning solvent.
    MotoSport recommends a premium foam filter solvent – never use gasoline or harsh chemicals, as these cause filter degradation.
  2. Gently squeeze and massage the foam to remove dirt. Do not twist or wring out the element, which can cause tears or seams to open.
  3. Rinse thoroughly with clean water and allow the filter to air dry completely. Avoid high heat sources like blow dryers. 
  4. Once dry, pour specialized foam filter oil into a plastic bag, insert the filter, and knead the oil in until the entire surface is evenly saturated. You want a consistent, tacky coating – too little oil lets dirt pass, too much can block airflow.
  5. Squeeze out any excess oil but do not wring. Ensure oil coverage around any seams and edges.

Reinstalling the RM85 Air Filter

  1. Inspect the airbox and filter sealing surface; wipe out any dirt or moisture using a clean lint-free rag.
  2. Apply a light bead of air filter grease around the base flange on the filter for an enhanced seal (especially important for the RM85's airbox design).
  3. Place the clean, oiled filter with its cage back into the airbox, ensuring a snug fit and zero gaps.
  4. Reattach the air cleaner cap and fasten the wing nut, then reinstall the seat securely.

When to Replace the Air Filter

  • If the filter shows holes, collapsed foam, or torn seams during cleaning, install a new element immediately.
  • Replacement intervals depend on riding conditions, but the high-revving RM85 benefits from a new filter more frequently than many four-strokes. Replace after heavy mud or extremely dusty rides, or if the filter will not clean up thoroughly.

Proprietary MotoSport Tips for 2018 Suzuki RM85 Owners

  • The RM85's engine is highly responsive but vulnerable to minor intake leaks; always check for a positive seal at the air filter every ride.
  • Never run the bike without a properly oiled foam filter in place. Dry filters allow dust directly into the engine, rapidly accelerating top-end wear.
  • Use only air filter oil formulated for dirt bikes. Street bike or car filter oils may not adhere or protect from fine dust encountered with motocross bikes.
  • The stock air filter cage is robust, but if you regularly ride in extremely sandy environments, consider an aftermarket cage and dual-layer filter for additional protection – available at MotoSport.
  • MotoSport stocks all replacement filters, OEM cages, and filter oils recommended for your specific 2018 RM85.

Proper, regular air filter maintenance keeps your 2018 Suzuki RM85 at its race-winning best – and ensures engine reliability ride after ride.

Related Shopping Categories

Shop Air Filters for a 2018 Suzuki RM85 Dirt Bike.

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Shop Air Box Covers for a 2018 Suzuki RM85 Dirt Bike.

Shop Tools for a 2018 Suzuki RM85 Dirt Bike.

Shop Intake Parts for a 2018 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.