Air Filter Cleaning – Replacement Guide for 2017 Yamaha YZ250

Shop parts for a 2017 Yamaha YZ250 Dirt Bike.

Your 2017 Yamaha YZ250 is a legendary 2-stroke machine built for hard-charging off-road performance. To keep your engine protected and delivering peak power, regular air filter maintenance is critical. Whether you ride motocross or conquer trails, dirt and debris can quickly clog the air filter, placing your engine at risk and limiting performance. Below is the MotoSport.com proprietary step-by-step guide to cleaning and replacing the air filter on your specific model – be sure to follow the special notes unique to your YZ250.

Tools & Supplies Needed

  • Clean rags
  • Air filter cleaner (foam filter specific)
  • Foam air filter oil
  • Grease (lithium-based)
  • Replacement YZ250 air filter (OEM recommended)
  • Bucket & warm water (for deep cleaning)
  • Gloves (recommended)
  • 8mm socket or T-handle (for seat bolts)

Removing the Air Filter

  • Remove both seat bolts with an 8mm socket. Slide the seat back & up to remove.
  • You now have direct access to the air filter located atop the airbox.
  • Loosen the filter's retaining bolt or wing nut. Carefully pull the filter and cage assembly out – avoid knocking debris into the intake tract.

Cleaning

  • Inspect the filter for tears or significant damage; if present, always replace.
  • To clean: Gently tap the filter to remove loose dirt. Soak in a bucket of warm water with foam filter cleaner or a mild dish soap. Massage and squeeze – never twist – the filter to work dirt out. Rinse thoroughly in clean water. Repeat if necessary.
  • Allow the filter to air dry completely. Do not use compressed air or high heat, which can damage the foam.

Oiling – Reinstallation

  • Once dry, evenly apply foam filter oil, working it in until the entire filter is coated but not dripping. The filter should feel sticky, assuring dust is trapped before it reaches your engine.
  • Apply a thin film of grease to the sealing flange of the filter for a secure air-tight fit.
  • Reattach the filter to its cage (check for correct orientation), and carefully insert it into the airbox, ensuring the entire edge contacts the sealing surface.
  • Reinstall and tighten the filter retaining bolt/wing nut hand-tight. Double-check that the filter is seated properly and no gaps are present.
  • Reinstall the seat – align the front tab and secure with both bolts.

Replacement: When & Why

  • If the filter shows signs of breaking down, thinning, or has tears – replace it immediately. Quality foam filters will outlast cheaper alternatives.
  • Riding in dry, dusty, or sandy conditions? Inspect and clean after every ride. Yamaha recommends cleaning after every race, or every two to three hours of riding, whichever comes first. Never let a dirty filter risk your engine.

2017 YZ250 Specific Notes

  • The 2017 YZ250 utilizes a simple airbox and filter cage design for quick access and rapid changes between motos – perfect for competitive riders.
  • The airbox seal is crucial: always inspect mating surfaces for grit and wipe them clean before reinstalling the filter.
  • If your YZ250 is fitted with an aftermarket airbox cage, follow manufacturer-specific reinstallation steps, but always ensure a dust-tight seal.

Tips for Maximum Performance & Durability

  • Always keep a spare, clean, pre-oiled filter in a sealed bag for fast swaps on race days.
  • Grease the filter lip every installation to prevent unfiltered air leaks.
  • Never run your YZ250 without an air filter, even briefly – the 2-stroke engine is especially vulnerable to damage from dirt and grit.

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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.