Air Filter Cleaning – Replacement Guide for 1998 Yamaha PW50

Shop parts for a 1998 Yamaha PW50 Dirt Bike.

The 1998 Yamaha PW50 features a foam air filter housed inside the air cleaner box. Maintenance is critical for reliable engine performance and durability, especially due to the PW50's two-stroke engine and its intended use for young riders. MotoSport.com provides this exclusive guide for PW50 owners.

Why Maintain Your PW50 Air Filter?

  • Keeps dust, dirt & debris out of your engine.
  • Ensures maximum airflow for smooth acceleration and throttle response.
  • Protects engine internals – essential for longevity, especially in off-road, dusty conditions.

Tools & Materials Needed

  • Foam-filter safe cleaner & mild detergent
  • Foam filter oil
  • Clean water
  • Lint-free towels
  • Gloves (recommended)
  • Replacement filter element if damaged - standard dual-layer foam OE style

PW50 Air Filter Removal Instructions

  1. Ensure the bike is off and cooled down.
  2. Locate the air cleaner box below the seat and right side panel.
  3. Remove the seat by releasing the seat latch and lifting off.
  4. Unfasten the air box cover screws using a screwdriver.
  5. Gently lift the air box cover; note filter orientation for reinstallation.
  6. Carefully remove the foam air filter from the housing.

Cleaning Your PW50 Foam Air Filter

  1. Fill a bucket with warm water and mild detergent designed for foam air filters.
  2. Submerge the filter; squeeze (do not wring or twist) repeatedly to release dirt and oil.
  3. Drain and refill with clean water, repeating as needed until water runs clear.
  4. Set the filter on a clean towel to dry naturally – avoid direct sunlight and compression.

Oiling & Reinstalling Your Filter

  1. Once dry, evenly apply foam filter oil to the filter element; massage gently to ensure uniform coverage.
  2. Inspect sealing surfaces for debris – wipe with a clean cloth if needed.
  3. Reinstall the filter into the air box with original orientation.
  4. Replace the air box cover, tighten screws gently to avoid stripping.
  5. Reinstall the seat, ensuring it latches securely.

When to Replace the Air Filter

  • If the foam shows tears, cracks, hardening, or cannot be cleaned effectively, replace with an OE-style dual-layer foam filter for best filtration and fitment.
  • Replacement is recommended every season for regular riders, or more often in muddy/sandy environments.
  • Always inspect after riding in heavy dust, mud, or water crossings.

PW50-Specific Model Notes

  • The 1998 PW50 uses a simple, easily accessible foam filter element compatible with all model years from 1981 onward, making sourcing replacements straightforward.
  • Dual-layer foam design - optimal for trapping fine particles while providing airflow suitable for the PW50's small two-stroke engine.
  • Rehousing the filter properly is essential - avoid over-oiling, which can restrict airflow and hurt performance.

Expert Tip: Common Mistakes to Avoid

  • Do not use gasoline or harsh solvents to clean foam - this breaks down the filter glue and foam.
  • Avoid wringing or twisting filter - squeeze gently to preserve foam structure.
  • Always check the air box for debris before installing the filter.
  • Do not operate PW50 without an oiled filter - risk of dirt ingestion and engine damage is high.

Keeping your air filter clean and properly maintained is the single best way to protect your PW50 engine, ensuring your young rider gets the most out of every rideexclusive guidance from MotoSport.com for owners who truly care for their bikes.

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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.