K&N Air Filter - HD-0900 Replacement — Harley-Davidson Sportster 1200 Custom, Sportster 883 Custom, Roadster (2004-2009)

K&N HD-0900 air filter for V-twin motorcycles, built from pleated cotton-gauze media with an OEM-style sealing bead for direct airbox fit. Washable and reusable — pre-oiled and ready to install without fuel management recalibration.

Features

• Pleated cotton-gauze media for large filtration area
• Multi-layer woven construction for excellent filtration
• Washable and reusable design
• Pre-oiled and ready to ride
• Direct OEM airbox fit with application-specific sealing bead
• Made in the USA for over 40 years

Specifications

• Brand: K&N
• Manufacturer Part #: HD-0900
• UPC: 024844196644
• Length: 10.25 in
• Width: 10.25 in
• Height: 3.93 in
• Weight: 1.4 lbs

Fitment

Fits V-twin motorcycles with OEM airbox compatibility. Verify application and sealing bead match your specific model before ordering.

Frequently Asked Questions

Does this require a fuel tuner or ECU reprogram?

No — fuel management modifications are not normally required. The filter works with stock engine mapping.

How often should I clean it?

Inspect every oil change. Clean and re-oil when visibly dirty, typically every 50,000 miles in normal riding.

Is it pre-oiled and ready to install?

Yes — the filter arrives pre-oiled and ready to ride. No additional oiling or preparation needed.

Can I use this with any V-twin motorcycle?

This part fits V-twin applications with compatible OEM airbox geometry. Confirm the sealing bead and dimensions match your bike's stock airbox before purchasing.

What's included in the box?

The HD-0900 filter element alone. You reuse your existing airbox and mounting hardware.