Air Filter Cleaning & Replacement Guide for 1979 Suzuki RM80

Shop parts for a 1979 Suzuki RM80 Dirt Bike.

The 1979 Suzuki RM80 stands out as a rare, collectible 2-stroke motocross bike featuring unique one-year-only square fenders. Proper air filter maintenance is essential for performance – a clean filter ensures optimal airflow and engine protection in all riding conditions. Here’s an exclusive step-by-step guide from MotoSport on cleaning and replacing the air filter for your 1979 RM80:

1. Remove the Side Panel & Air Filter

  • Place the bike on a stand for stability.
  • Use the correct tools to remove the right-side panel, revealing the airbox.
  • Carefully unfasten the air filter cage and withdraw the filter from the airbox, noting the filter position for reinstallation.

2. Inspect & Pre-Clean

  • Check the filter for visible damage, tears, or signs of degradation. Severe damage means it needs immediate replacement.
  • If only mildly dirty, tap the filter gently to remove loose debris and dust away from the airbox.

3. Clean the Air Filter

  • For the original 1979 RM80, the filter is typically two-stage, open-cell foam.
  • Submerge the filter in a dedicated foam filter cleaner or mild, solvent-free soap. Massage out dirt & old oil – avoid twisting or wringing, which can damage the foam.
  • Rinse thoroughly with clean water until all residue is gone. Gently squeeze out excess water and allow the filter to air dry completely.

4. Inspect & Service the Filter Cage

  • Clean the filter cage with soap and water, removing any residual dirt or old oil.
  • Check for cracks or damage. Replace the cage if compromised to ensure a proper seal.

5. Re-Oil the Foam Filter

  • Apply high-quality foam filter oil liberally but evenly to ensure maximum filtration without blocking airflow.
  • Work the oil through all layers of the foam, ensuring full coverage. Too much oil can restrict airflow; too little leaves the engine exposed to dust.

6. Reinstall the Filter

  • Fit the oiled filter securely to the cage.
  • Check the airbox sealing surface – clean it to guarantee an airtight fit.
  • Insert the filter and cage assembly back into position. Confirm a snug fit without gaps on the sealing edge.
  • Reattach the side panel and ensure all fasteners are tight.

When to Replace the Air Filter

  • Replace the filter if you notice any rips, thinning, or deterioration not resolved by cleaning.
  • For competition or in dusty conditions, check and clean after every ride. In lighter conditions, inspect every 5-10 hours of riding.

Special Notes for 1979 Suzuki RM80 Owners

  • The RM80’s air filter is model-specific, and one-year production means sourcing correct fitment is vital for optimal sealing and performance.
  • Consider premium dual-stage filters with modern materials for longer life and improved filtration efficiency. Confirm cage compatibility before purchase.
  • Always check the airbox drain for water or excess oil, a simple way to prevent potential engine damage.

Regular maintenance of your RM80’s air filter not only boosts throttle response but prolongs engine life–protecting your rare vintage ride for years to come. For factory-quality replacement filters, service parts, and care products, rely on MotoSport’s trusted selection above.

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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.