Air Filter Cleaning – Replacement Guide for 2019 Yamaha PW50

Shop parts for a 2019 Yamaha PW50 Dirt Bike.

Maintaining the air filter on your 2019 Yamaha PW50 is one of the most essential tasks that keeps your engine running reliably and powerfully. This guide from MotoSport.com is designed specifically for PW50 owners and covers everything you need to know – from cleaning to replacement, including unique notes about your model.

PW50 Air Filter Design – Key Notes

  • Dirt bike air filters on the 2019 PW50 use a dual-stage foam design. The outer coarse foam traps dirt and sand, while the fine inner foam captures smaller particulates for enhanced engine protection.
  • Both foam layers are fused to prevent dirt from getting between layers, ensuring maximum filtration and airflow for your two-stroke engine.
  • The PW50 air filter sits inside a dedicated housing box, accessible beneath the seat adjacent to the left rear shock. You'll need to remove the seat for access.
  • Regular cleaning is critical for the PW50 engine performance, given its small displacement and two-stroke configuration, which is more sensitive to airflow restriction than larger models.

Tools – Supplies Needed

  • Number three Phillips screwdriver
  • 8 mm socket
  • Air filter cleaner (biodegradable options available) and filter oil
  • Safety glasses, rubber gloves, clean rags
  • Replacement foam filter if existing is torn or excessively worn

PW50 Air Filter Cleaning Routine

  • Remove the seat by undoing the rear bolts, then pull the seat off. 
  • Locate the air filter cover, positioned in front of the left rear shock. Unfasten and remove the cover.
  • Carefully remove the air filter from its housing. Inspect it for tears or deformation – replace if damage is present.
  • If reusing the filter, gently tap it to remove loose debris. Wash in a specialized air filter cleaner. Avoid gasoline or caustic solvents, which degrade foam.
  • Rinse with clean water and squeeze (do not wring) until all contaminants are gone. Allow to fully dry.
  • Saturate the filter with high-quality filter oil for foam units. Massage oil thoroughly into both layers to ensure even coverage. 
  • Reinstall the filter into the air box, ensuring the sealing edge seats flat against the air box for a proper seal.
  • Reattach the air filter cover and seat.

PW50 Replacement Interval – Recommendations

  • Clean the air filter after the first three months of ownership, then every six months afterwards under typical use. For dusty or sandy conditions, inspect and clean more frequently.
  • Replace the filter at least once per season, or immediately if you spot significant wear or damage.

Important Model-Specific Tips

  • The 2019 PW50 air intake is low-mount near the rear shock, so it picks up dust easily. Always inspect the air box for excess dirt, especially after off-road rides.
  • This two-stroke engine requires unrestricted airflow for reliable starting and smooth running. Neglected air filters lead to poor throttle response, engine bogging, or even top-end damage over time.
  • When using aftermarket filters, confirm fitment for the 2019 PW50 to avoid sealing issues specific to the air box shape.

Keep your 2019 Yamaha PW50 riding strong by maintaining the air filter with these MotoSport-proven steps. Regular air filter care not only protects your engine – it ensures every ride is as fun and smooth as the first.

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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.