Air Filter Cleaning – Replacement Guide for 1999 Yamaha PW50

Shop parts for a 1999 Yamaha PW50 Dirt Bike.

The 1999 Yamaha PW50 is a beloved entry-level dirt bike known for its easy operation, reliability, and low maintenance requirements. Keeping the air filter clean and properly maintained is vital for optimal engine performance and longevity. This MotoSport.com guide provides proprietary step-by-step instructions for cleaning and replacing the air filter on your PW50, specifically tailored to the unique foam filter design used in this model.

PW50 Air Filter Overview

  • Type: Dual-stage open-pore foam filter
  • Function: Traps coarse dirt outside, smaller particles inside – maintains maximum airflow while providing excellent filtration
  • Sealing: Thick flat foam ring ensures a tight airbox seal to prevent dirt infiltration
  • Construction Note: Outer and inner layers are flame-laminated, forming a fused one-piece design that resists separation and clogging

Cleaning Your PW50 Air Filter

  1. Remove the seat – access the airbox: Use your fingers or the OE tool to lift the seat off; locate the airbox just beneath.
  2. Take out the filter: Carefully pull the foam filter from the airbox. Inspect for tears or excessive wear.
  3. Pre-clean: Tap out loose dirt gently or use compressed air from the clean inside out. Avoid high psi to prevent tearing.
  4. Wash: Submerge filter in a mild soap & water solution. Squeeze (do not wring) to release dirt. Repeat until water runs clear.
  5. Dry: Allow to air dry fully out of direct sunlight. Do not use heat sources.
  6. Inspect foam – sealing ring: Check for degradation or flattening. The unique thick foam ring must seal properly to maintain performance.
  7. Oil the filter (if using oilable foam): Apply dedicated foam air filter oil evenly throughout. Do not over-oil – excessive oil can restrict airflow.
  8. Reinstall: Place filter back in airbox. Make sure the flat sealing ring seats flush for maximum contact.
  9. Reattach seat: Confirm proper fit.

Replacing Your PW50 Air Filter

  • Replace if: Foam is torn, excessively dirty, glue seams are splitting, or sealing ring loses form.
  • Genuine parts – best fit: Use dual-stage foam filters engineered for the PW50's airflow demands. Avoid single-stage or generic parts that may not seal correctly or could restrict airflow.
  • Installation: Always double check airbox fitment, and confirm that the filter sits flat against the airbox rim. Proper fitment will prevent dust bypass.

Motorcycle Model-Specific Notes

  • PW50 airbox is designed for easy filter access. Frequent checks and cleaning are quick – recommended every 5-10 riding hours, more often in dusty environments.
  • Don't substitute automotive or paper filters: The PW50's foam filter design is essential for both protection and performance.
  • Use exclusively formulated adhesive filters: Glue seams on dual-stage filters are built to withstand regular cleaning without breakdown.
  • Packing tip: Carry a spare oiled filter in a resealable bag for quick swaps on muddy & dusty rides.

Maintenance Frequency – Tips

  • Inspect after every ride in dusty or sandy conditions
  • Replace after 3–4 cleanings or 12 months of regular use unless damage or wear appears sooner

Conclusion

Proper air filter care is critical for your PW50's smooth running, long-term durability, and peak performance. Follow this MotoSport.com guide for the best results. For genuine replacement parts and performance upgrades, Shop parts for a 1999 Yamaha PW50 Dirt Bike.

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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.