Air Filter Cleaning & Replacement Guide for 1989 Honda CR250

Shop parts for a 1989 Honda CR250 Dirt Bike.

Maintaining a clean and properly oiled air filter is essential for the longevity and performance of your 1989 Honda CR250. This guide from MotoSport.com covers every step for inspecting, cleaning, and replacing the air filter, and discusses specific features and known considerations for this classic two-stroke model.

Why Air Filter Maintenance Is Critical

The CR250's high-revving two-stroke motor relies on maximized airflow while keeping dust and debris out. A clogged or improperly installed air filter can lead to power loss, hard starting, or much worsepremature engine wear. Given the airbox design of the 1989 CR250, dirt intrusion is a risk if the filter isn't seated and sealed correctly.

Accessing the Air Filter on the 1989 CR250

  • Remove your seat by unbolting the seat bolt(s).
  • Locate the air filter assembly underneathheld in with a set bolt and filter cage.
  • Carefully unscrew and pull out both the foam filter and cage as one unit. Be alert for any debris that could fall into the air boot during removal.

Cleaning the Air Filter

  • Visually inspect the filter for damage; replace if torn or extremely dirty.
  • If reusing, gently separate the foam from the cage.
  • Wash the filter in a bucket of clean, solvent-safe air filter cleaner designed for foam filters.
  • Knead but never wring or twist excessively–doing so can tear the foam or open seams.
  • Rinse thoroughly until all cleaner and debris are gone. Allow to air dry fully before continuing.

Oiling and Reinstalling the Air Filter

  • Fully saturate with quality foam filter oil, designed to trap even fine dust. Squeeze out excess oil until the filter is damp but not dripping–an even coating is vital.
  • For the 1989 CR250, apply a thin layer of waterproof grease to the edge of the filter where it seats against the airbox to enhance sealing and prevent dirt bypass–Honda White Lithium Grease, or a similar product, is recommended.
  • Reinstall the foam filter onto the cage, making sure the mounting holes align and everything sits flush.
  • Carefully slide the filter and cage back into the airbox. Secure with the set bolt, ensuring proper fit and seal all the way around.
  • Reinstall your seat.

Replacement Schedule & Pro Tips for the 1989 CR250

  • Clean and re-oil the filter after every dusty ride or every 2-3 rides in milder conditions as two-strokes ingest more air (and contaminants) than four-strokes.
  • Inspect the air boot and intake tract for dust or dirt before replacing the filter; clean as necessary to avoid debris getting into the engine.
  • The original 1989 CR250 is prone to airbox gasket leaks if not properly maintained. Replace the airbox gasket anytime you notice air leaks or at regular intervals during filter service.
  • Use only air filters specified for the 1989 CR250 to avoid fitment and sealing problems.
  • If your stock filter cage is cracked or deformed, replace it immediately to ensure a perfect seal. The 1989 model cage and mounting system are unique to this generation.

Anything Else Owners Should Know

  • The 1989 CR250's airbox is positioned high and towards the rear which helps with big water crossings, but makes filter inspections especially important in muddy conditions.
  • Always double-check the filter's seating–misalignment can occur with aged cages or improper reinstallation, increasing engine risk.
  • For the best protection and engine performance, use name-brand air filter oil and Honda-approved grease on sealing surfaces.

MotoSport.com is dedicated to supplying owners of classic models like the 1989 CR250 with everything from factory-matched air filters to the correct foam oils and gaskets for perfect maintenance every 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.